1: Introduction
2: Invoking Gre
3: Gre Grammar
4: Commands
5: Cookbook
6: Hints
7: History
8: Plans
9: Concept Index

9: Concept index

!, boolean 'not' operator [see Comparison operators]
$, protecting in system calls [see System]
$0 [see Scalar System Variables]
$ARGV built-in variable [see Commandline options]
$ARGV vector, to hold command-line arguments [see Vector System Variables]
$_ variable, implicit assignment to [see While and Until]
$_ variable, implicit printing of [see Print]
$_arrow_size, [see Scalar System Variables]
$_command_file variable (names the command file) [see Scalar System Variables]
$_command_file [see Scalar System Variables]
$_e, mathematical constant [see Builtin numerical constants]
$_eof [see Scalar System Variables]
$_exit_status [see Scalar System Variables]
$_fontsize [see Scalar System Variables]
$_graylevel [see Scalar System Variables]
$_linewidth [see Scalar System Variables]
$_linewidth_axis [see Scalar System Variables]
$_linewidth_symbol [see Scalar System Variables]
$_missingvalue [see Scalar System Variables]
$_pi, mathematical constant [see Builtin numerical constants]
$_symbolsize [see Scalar System Variables]
$_time [see Scalar System Variables]
$_u vector, to hold u data [see Vector System Variables]
$_v vector, to hold v data [see Vector System Variables]
$_version [see Scalar System Variables]
$_x vector, to hold x data [see Vector System Variables]
$_xleft [see Scalar System Variables]
$_xmargin [see Scalar System Variables]
$_xright [see Scalar System Variables]
$_xsize [see Scalar System Variables]
$_y vector, to hold y data [see Vector System Variables]
$_ybottom [see Scalar System Variables]
$_ymargin [see Scalar System Variables]
$_ysize [see Scalar System Variables]
$_ytop [see Scalar System Variables]
$_z vector, to hold z data [see Vector System Variables]
&&, boolean 'and' operator [see Comparison operators]
() for subroutines [see Mathematical subroutines]
** exponentiation operator [see Algebraic operators]
--debug commandline option (debugging) [see Commandline options]
--execute commandline option (execute string) [see Commandline options]
--help commandline option (get help) [see Commandline options]
--Library commandline option [see Commandline options]
--Optimize commandline option (set optimization level) [see Commandline options]
--option commandline option (general options) [see Commandline options]
--postscript commandline option (name postscript file) [see Commandline options]
--trace commandline option (tracing) [see Commandline options]
--version commandline option (print version) [see Commandline options]
--warning commandline option (control warnings) [see Commandline options]
--which_library commandline option [see Commandline options]
-d commandline option (debugging) [see Commandline options]
-d filename command [see -X]
-e commandline option (execute string) [see Commandline options]
-f filename command [see -X]
-h commandline option (get help) [see Commandline options]
-L commandline option (sets library directory) [see Commandline options]
-o commandline option (general options) [see Commandline options]
-O commandline option (set optimization level) [see Commandline options]
-p commandline option (name postscript file) [see Commandline options]
-r filename command [see -X]
-t commandline option (tracing) [see Commandline options]
-v commandline option (print version) [see Commandline options]
-w commandline option (control warnings) [see Commandline options]
. operator, to concatenate strings [see Concatenating Textual Items]
.gz suffix in filenames [see Open]
.Z suffix in filenames [see Open]
// for regular expression matching [see Comparing Textual Items With Regular Expressions]
;, using to separate commands [see Command syntax]
<FILEHANDLE> syntax, in loops [see While and Until]
=~ syntax, for modifying text-valued variables [see Modifying Strings]
?, question operator [see Comparison operators]
abs(x) subroutine [see Builtin functions that take one argument]
accented characters in text <1> [see Set font encoding]
accented characters in text [see Entering Text]
acos(x) subroutine [see Builtin functions that take one argument]
acosh(x) subroutine [see Builtin functions that take one argument]
aesthics, of line widths [see Set line width]
aliases, commandline [see Commandline options]
and, boolean operator [see Comparison operators]
arc, drawing [see Draw arc]
arithmetic expressions (constant) [see Efficiency considerations]
arithmetic, on integers [see Convention on division of constants]
arithmetic [see Algebraic operators]
arrow heads, setting type of [see Set arrow type]
arrow, setting type of head [see Set arrow type]
arrows, drawing several [see Draw arrows]
arrows, drawing single one [see Draw arrow]
arrows, setting scale <1> [see Set v scale]
arrows, setting scale [see Set u scale]
ascent of text [see Builtin functions that take one argument]
asin(x) subroutine [see Builtin functions that take one argument]
asinh(x) subroutine [see Builtin functions that take one argument]
atan(x) subroutine [see Builtin functions that take one argument]
atan2(x,y) subroutine [see Builtin functions that take two arguments]
atanh(x) subroutine [see Builtin functions that take one argument]
awk programmers, hints and pitfalls [see Awk programmers]
axes, drawing manually <1> [see Draw y axis]
axes, drawing manually [see Draw x axis]
axes, drawing [see Draw axes]
axes, setting format for numbers <1> [see Set y format]
axes, setting format for numbers [see Set x format]
axes, setting length of x-axis [see Set x size]
axes, setting length of y-axis [see Set y size]
axes, setting type of x-axis [see Set x type]
axes, setting type of y-axis [see Set y type]
axes, setting x margin [see Set x margin]
axes, setting x name [see Set x name]
axes, setting x range [see Set x axis]
axes, setting y margin [see Set y margin]
axes, setting y name [see Set y name]
axes, setting y range [see Set y axis]
axis, tic direction [see Set tics]
axis, tic length [see Set tic size]
back-tic system calls in quoted strings [see System Calls In Quoted Strings]
backtic system calls in quoted strings [see System Calls In Quoted Strings]
benchmark, parsing [see Parsing and execution phases]
birthday paper [see Example 8]
boolean operations [see Comparison operators]
bottom margin [see Set y margin]
box-plots <1> [see Draw y box plot at]
box-plots [see Draw x box plot at]
boxes, drawing [see Draw box]
bugs, how to report [see Bugs]
bugs, list of [see Bugs]
c programmers, pitfalls [see C programmers]
cd command [see Cd]
ceil(x) subroutine [see Builtin functions that take one argument]
charts, sample of drawing [see Example 7]
chomp subroutine [see Chomp]
chop subroutine [see Chop]
clipping data [see Set clip]
close subroutine [see Close]
cmd command [see Cmd]
cm_to_pt(x) subroutine [see Builtin functions that take one argument]
colon operator [see Comparison operators]
color of pen, in black/white [see Set graylevel]
color, setting [see Set color]
colorscale of image [see Set image colorscale]
column data, how to read with read columns command [see Read columns]
columns, regression [see Regress]
command file, named in $_command_file variable [see Scalar System Variables]
command-file name, using as a title [see Draw title]
commandline aliases [see Commandline options]
commandline option --Library [see Commandline options]
commandline option --which_library [see Commandline options]
commandline option -d or --debug [see Commandline options]
commandline option -e or --execute [see Commandline options]
commandline option -h or --help [see Commandline options]
commandline option -O or --Optimize [see Commandline options]
commandline option -o or --option [see Commandline options]
commandline option -p or --postscript [see Commandline options]
commandline option -t or --trace [see Commandline options]
commandline option -v or --version [see Commandline options]
commandline option -w or --warnings [see Commandline options]
commandline options [see Commandline options]
comparing numberical values [see Comparison operators]
comparing strings with regular expressions [see Comparing Textual Items With Regular Expressions]
comparing strings [see Comparing Textual Items Simply]
compressed files [see Open]
concatenating strings with dot operator [see Concatenating Textual Items]
conditional execution [see Conditional statements]
constant arithmetic expressions [see Efficiency considerations]
contours, drawing [see Draw contour]
contours, labelling [see Set contour label position]
contours, setting format for numbers [see Set contour format]
convert columns to grid command [see Convert columns to grid]
convert command [see Convert]
convert grid to image command [see Convert grid to image]
cos(x) subroutine [see Builtin functions that take one argument]
cosh(x) subroutine [see Builtin functions that take one argument]
courier font [see Set font to]
curve-fitting [see Regress]
curves, drawing [see Draw curve]
dashed lines [see Set dash]
debugging, controlling with -D commandline options [see Commandline options]
debugging, inserting comments in PostScript file [see Pscomment]
decreasing, x axis [see Set x axis]
defining new Gre commands [see Cmd]
delete command [see Delete]
deleting files with unlink [see Builtin functions that take more than two arguments]
density of seawater [see Builtin functions for seawater properties]
descent of text [see Builtin functions that take one argument]
die subroutine [see Die]
directory, printing current [see Pwd]
do ... while loop [see While and Until]
do loop [see Loops]
dot operator, on strings [see Concatenating Textual Items]
draw arc command [see Draw arc]
draw arrow command [see Draw arrow]
draw arrows command [see Draw arrows]
draw axes command [see Draw axes]
draw box command [see Draw box]
draw contour command [see Draw contour]
draw curve command [see Draw curve]
draw grid command [see Draw grid]
draw image command [see Draw image]
draw isopycnal command [see Draw isopycnal]
draw label command [see Draw label]
draw line from command [see Draw line from]
draw polygon command [see Draw polygon]
draw symbol command [see Draw symbol]
draw title command [see Draw title]
draw x axis command [see Draw x axis]
draw x box plot at command [see Draw x box plot at]
draw y axis command [see Draw y axis]
draw y box plot at command [see Draw y box plot at]
drawing arcs [see Draw arc]
drawing arrow between two points [see Draw arrow]
drawing arrows at column data [see Draw arrows]
drawing axes <1> [see Draw symbol]
drawing axes [see Draw axes]
drawing boxes [see Draw box]
drawing contours [see Draw contour]
drawing curves [see Draw curve]
drawing grid [see Draw grid]
drawing images [see Draw image]
drawing line segments [see Draw line from]
drawing maps [see Example 7]
drawing polygons [see Draw polygon]
drawing text [see Draw label]
efficiency considerations, arithmetic expressions [see Efficiency considerations]
ends of lines, drawing [see Set line cap]
equation of state for temperature [see Builtin functions for seawater properties]
erf(x) subroutine [see Builtin functions that take one argument]
erfc(x) subroutine [see Builtin functions that take one argument]
escape code for newline [see Print]
escape code for tab [see Print]
executing small programs with -e commandline option [see Commandline options]
existence of files, testing [see -X]
exit command [see Exit]
exiting the program with die [see Die]
exiting the program with draw title [see Draw title]
exiting the program with exit [see Exit]
exp(x) subroutine [see Builtin functions that take one argument]
exp10(x) subroutine [see Builtin functions that take one argument]
exponentiation with ** operator [see Algebraic operators]
file handles [see Open]
filename, expansion [see Glob]
files, compressed [see Open]
files, deleting with unlink [see Builtin functions that take more than two arguments]
files, given as URL names [see Open]
files, removing with unlink [see Builtin functions that take more than two arguments]
files, testing status [see -X]
files, unlinking [see Builtin functions that take more than two arguments]
filled curves [see Draw curve]
flags, setting [see Set flag]
floating point operations [see Precision used in calculations]
floor(x) subroutine [see Builtin functions that take one argument]
flow of control [see Flow of control]
font encoding vector [see Set font encoding]
font size, setting [see Set font size]
font, setting [see Set font to]
fonts, list of available [see Set font to]
for loop <1> [see For]
for loop [see Loops]
foreach loop <1> [see Foreach]
foreach loop [see Loops]
format for numbers on contours [see Set contour format]
formatted output into strings, with sprintf [see Printing Into Strings]
formatted printing, with printf [see Printf]
French accents in text [see Entering Text]
ftp site [see Top]
functions, defining with sub [see Sub]
functions, how to plot [see Example 6]
future of gre [see Plans]
gaussian distribution, generating random numbers in [see Builtin functions that take no arguments]
gawk programmers, hints and pitfalls [see Awk programmers]
glob subroutine [see Glob]
graylevel of pen [see Set graylevel]
gre.cmd, controlling with -L commandline option [see Commandline options]
grerc file [see User startup file]
gri programmers, pitfalls [see Gri programmers]
grid, drawing [see Draw grid]
grid, reading data [see Read grid data]
grid, reading x-component [see Read grid x]
grid, reading y-component [see Read grid y]
grid, setting x-characteristics [see Set x grid]
grid, setting y-characteristics [see Set y grid]
gzipped files [see Open]
help, getting information on commandline options with -h flag [see Commandline options]
helvetica font [see Set font to]
history [see History]
hsv, setting color [see Set color]
hyperbolic sine, cosine, tangent [see Builtin functions that take one argument]
i/o, opening files [see Open]
if statement [see Conditional statements]
image, colorscale [see Set image colorscale]
image, drawing [see Draw image]
image, interpolation from grid [see Convert grid to image]
image, setting range [see Set image range]
index subroutine [see Index]
int(x) subroutine [see Builtin functions that take one argument]
integer arithmetic [see Convention on division of constants]
integer operations [see Precision used in calculations]
internet file access [see Open]
interpolation of variable values into strings [see Variable Interpolation In Quoted Strings]
interpolation, from grid to image [see Convert grid to image]
intersections of lines, drawing [see Set line join]
isopycnals on TS diagrams [see Draw isopycnal]
isopycnals, labelling [see Set contour label position]
labelling of contours and isopycnals [see Set contour label position]
landscape orientation of page, setting [see Set page]
last command [see Last]
latitude [see Builtin functions for map projections]
left margin [see Set x margin]
length of a string [see Builtin functions that take one argument]
length of x-axis [see Set x size]
length of y-axis [see Set y size]
length("string") subroutine [see Builtin functions that take one argument]
library directory, setting with commandline option [see Commandline options]
line width, setting [see Set line width]
linear regression [see Regress]
linear x-axis [see Set x type]
linear y-axis [see Set y type]
linegraphs [see Draw curve]
lines, dashed [see Set dash]
linux version [see Top]
ln(x) subroutine [see Builtin functions that take one argument]
log x-axis [see Set x type]
log y-axis [see Set y type]
log10(x) subroutine [see Builtin functions that take one argument]
logical operations [see Comparison operators]
longitude [see Builtin functions for map projections]
loop, do ... while [see While and Until]
loop, for [see For]
loop, foreach [see Foreach]
loop, while [see While and Until]
loops [see Loops]
ls command [see Ls]
map projections [see Builtin functions for map projections]
maps, sample of drawing [see Example 7]
maps, setting coordinate system [see Set map projection]
margin below axes [see Set y margin]
margin to left of axes [see Set x margin]
mathematical constants, pi, e, etc [see Builtin numerical constants]
mathematical operators, order of precedence [see Algebraic operators]
mathematics, on integers [see Convention on division of constants]
mathematics [see Mathematics]
max(x1,x2) subroutine [see Builtin functions that take two arguments]
min(x1,x2) subroutine [see Builtin functions that take two arguments]
missing value, setting [see Set missing value]
modifying strings with s/// [see Modifying Strings]
modules [see Use]
month of year, timeseries [see Example 9]
my command, making variables local to block [see My]
name of postscript file, setting [see Commandline options]
name of x-axis [see Set x name]
name of y-axis [see Set y name]
namespaces, controlling with package command [see Package]
new page command [see New Page]
newline character [see Print]
non-English languages [see Set font encoding]
non-English text [see Entering Text]
not, boolean operator [see Comparison operators]
numerical constants and _ character [see Underline convention in numerical constants]
numerical values, comparing [see Comparison operators]
open subroutine [see Open]
open() subroutine [see Builtin functions that take one argument]
operator precedence [see Algebraic operators]
optimization, constant arithmetic expressions [see Efficiency considerations]
optimization, controlling [see Commandline options]
options (general), setting with -e commandline option [see Commandline options]
or, boolean operator [see Comparison operators]
order of precedence of operators [see Algebraic operators]
orientation of page, setting [see Set page]
overhead projection, example [see Example 6]
overlying lines [see Draw curve]
package command [see Package]
palatino font [see Set font to]
parentheses, needed for subroutines [see Mathematical subroutines]
parsing, including modules [see Use]
parsing, performance [see Parsing and execution phases]
pen color, setting in black/white [see Set graylevel]
performance, parsing speed [see Parsing and execution phases]
period operator, on strings [see Concatenating Textual Items]
perl programmers, pitfalls [see Perl programmers]
personal library in ~/.grerc file [see User startup file]
physical properties of seawater [see Builtin functions for seawater properties]
plans [see Plans]
popt handling of commandline aliases [see Commandline options]
portrait orientation of page, setting [see Set page]
postscript file, how to control name [see Commandline options]
PostScript file, inserting comments [see Pscomment]
potential temperature of seawater [see Builtin functions for seawater properties]
pow(x,y) subroutine [see Builtin functions that take two arguments]
precedence of operators [see Algebraic operators]
precision of calculations [see Precision used in calculations]
print commands [see Print]
print subroutine [see Builtin functions that take one argument]
printf commands [see Printf]
printf subroutine [see Builtin functions that take one argument]
printing a warning [see Warn]
printing into strings with sprintf [see Printing Into Strings]
printing with format control, with printf [see Printf]
program termination [see Die]
proj, original source at USGS [see Set map projection]
projection of maps [see Set map projection]
proj_lonlat_to_x($lon, $lat) subroutine [see Builtin functions for map projections]
proj_lonlat_to_y($lon, $lat) subroutine [see Builtin functions for map projections]
prototype, in cmd [see Cmd]
prototype, in sub [see Sub]
pscomment command [see Pscomment]
pt_to_cm(x) subroutine [see Builtin functions that take one argument]
pwd command [see Pwd]
query command [see Query]
question-mark operator [see Comparison operators]
quiting the program [see Die]
rand() subroutine [see Builtin functions that take no arguments]
rand() [see Builtin functions that take no arguments]
random number generators, rand() and rand_gaussian() [see Builtin functions that take no arguments]
random numbers [see Builtin functions that take no arguments]
rand_gaussian() subroutine [see Builtin functions that take no arguments]
rand_gaussian() [see Builtin functions that take no arguments]
range of images, setting [see Set image range]
rapidograph line widths [see Set line width]
read columns command [see Read columns]
read command [see Read]
reading grid data [see Read grid data]
reading grid x-component [see Read grid x]
reading grid y-component [see Read grid y]
reading variables [see Read variable]
reading x-component of grid [see Read grid x]
reading y-component of grid [see Read grid y]
rectangles, drawing [see Draw box]
RedHat linux version [see Top]
regress command [see Regress]
regular expression for comparing strings [see Comparing Textual Items With Regular Expressions]
regular expressions [see Regular Expression Syntax]
removing files with unlink [see Builtin functions that take more than two arguments]
reorder command [see Reorder]
reporting bugs [see Bugs]
reserved words [see Reserved Words]
resource file in ~/.grerc file [see User startup file]
return command [see Return]
rewind subroutine [see Rewind]
rewind() subroutine [see Builtin functions that take one argument]
rgb, setting color [see Set color]
RPM redhat linux distribution [see Top]
s/// operator [see Modifying Strings]
seawater sound-speed [see Example 6]
seawater, physical properties [see Builtin functions for seawater properties]
seed for random numbers [see Builtin functions that take no arguments]
semicolon, using to separate commands [see Command syntax]
set arrow size command [see Set arrow size]
set arrow type command [see Set arrow type]
set clip command [see Set clip]
set color command [see Set color]
set contour format command [see Set contour format]
set contour label position command [see Set contour label position]
set dash command [see Set dash]
set flag command [see Set flag]
set font encoding command [see Set font encoding]
set font size command [see Set font size]
set font to command [see Set font to]
set graylevel command [see Set graylevel]
set image range command [see Set image range]
set line cap command [see Set line cap]
set line join command [see Set line join]
set line width command [see Set line width]
set map projection command [see Set map projection]
set map projection system command [see Builtin functions for map projections]
set missing value command [see Set missing value]
set page command [see Set page]
set symbol size command [see Set symbol size]
set tic size command [see Set tic size]
set tics command [see Set tics]
set u scale command [see Set u scale]
set v scale command [see Set v scale]
set x axis command [see Set x axis]
set x format command [see Set x format]
set x grid command [see Set x grid]
set x margin command [see Set x margin]
set x name command [see Set x name]
set x size command [see Set x size]
set x type command [see Set x type]
set y axis command [see Set y axis]
set y format command [see Set y format]
set y grid command [see Set y grid]
set y margin command [see Set y margin]
set y name command [see Set y name]
set y size command [see Set y size]
set y type command [see Set y type]
setting colorscale of image [see Set image colorscale]
setting font size [see Set font size]
setting font [see Set font to]
setting image colorscale [see Set image colorscale]
setting length of x-axis [see Set x size]
setting length of y-axis [see Set y size]
setting line cap [see Set line cap]
setting line join [see Set line join]
setting line width [see Set line width]
setting missing value [see Set missing value]
setting orientation of page [see Set page]
setting page orientation [see Set page]
setting scale for x-component of arrows [see Set u scale]
setting scale for y-component of arrows [see Set v scale]
setting symbol size [see Set symbol size]
setting tic direction [see Set tics]
setting tic length [see Set tic size]
setting type of x-axis [see Set x type]
setting type of y-axis [see Set y type]
sin(x) subroutine [see Builtin functions that take one argument]
sinh(x) subroutine [see Builtin functions that take one argument]
sound-speed of seawater [see Example 6]
source ftp site [see Top]
speed of sound in seawater [see Example 6]
split command [see Split]
sprintf, discussion [see Printing Into Strings]
sqrt(x) subroutine [see Builtin functions that take one argument]
srand(x) subroutine [see Builtin functions that take one argument]
startup file gre.cmd, controlling with -L commandline option [see Commandline options]
statistics, generating random numbers [see Builtin functions that take no arguments]
statistics, regression on columns [see Regress]
statistics, Tukey box-plots <1> [see Draw y box plot at]
statistics, Tukey box-plots [see Draw x box plot at]
status of files, testing [see -X]
stdin, access with file handle <> [see While and Until]
stopping program execution [see Die]
string, length [see Builtin functions that take one argument]
strings, back-tic system calls in [see System Calls In Quoted Strings]
strings, comparing simply with eq and ne [see Comparing Textual Items Simply]
strings, comparing with regular expressions [see Comparing Textual Items With Regular Expressions]
strings, dot operator [see Concatenating Textual Items]
strings, modifying with s/// [see Modifying Strings]
strings, printing into with sprintf [see Printing Into Strings]
strings, variable interpolation in [see Variable Interpolation In Quoted Strings]
subroutines, defining with sub [see Sub]
subroutines [see Mathematical subroutines]
substr command [see Substr]
sw_alpha(S, T, p) subroutine [see Builtin functions for seawater properties]
sw_beta(S, T, p) subroutine [see Builtin functions for seawater properties]
sw_density(S, T, p) subroutine [see Builtin functions for seawater properties]
sw_freezing_temperature(S, p) subroutine [see Builtin functions for seawater properties]
sw_lapse_rate(S, t, p) subroutine [see Builtin functions for seawater properties]
sw_potential_temperature(S, T, p, pref) subroutine [see Builtin functions for seawater properties]
sw_salinity (C, T, p) subroutine [see Builtin functions for seawater properties]
sw_spice (C, T, p) subroutine [see Builtin functions for seawater properties]
symbol font [see Set font to]
symbols, setting size [see Set symbol size]
syntax [see Cautionary Notes On Syntax]
system calls in quoted strings [see System Calls In Quoted Strings]
system command [see System]
system variables [see System Variables]
tab character [see Print]
tan(x) subroutine [see Builtin functions that take one argument]
tanh(x) subroutine [see Builtin functions that take one argument]
testing file status [see -X]
text, ascent [see Builtin functions that take one argument]
text, descent [see Builtin functions that take one argument]
text, drawing [see Draw label]
text, finding width/ascent/descent [see Builtin functions that take one argument]
text, ISO characters [see Entering Text]
text, setting font size [see Set font size]
text_ascent("string") subroutine [see Builtin functions that take one argument]
text_descent("string") subroutine [see Builtin functions that take one argument]
text_width("string") subroutine [see Builtin functions that take one argument]
theoretical functions, how to plot [see Example 6]
thousands groupings in constants, with _ [see Underline convention in numerical constants]
tics, on axes, setting length [see Set tic size]
timeseries with month of year [see Example 9]
timesRoman font [see Set font to]
tracing of program compilation [see Commandline options]
trailing until statement [see While and Until]
trailing while statement [see While and Until]
TS diagrams, isopycnals [see Draw isopycnal]
Tukey box-plots <1> [see Draw y box plot at]
Tukey box-plots [see Draw x box plot at]
underline character in numerical constants [see Underline convention in numerical constants]
uniform distribution, generating random numbers in [see Builtin functions that take no arguments]
unless statement [see Conditional statements]
unlink subroutine [see Builtin functions that take more than two arguments]
until loop [see Loops]
until, trailing [see While and Until]
URL of ftp site [see Top]
URL, using in names of data/command files [see Open]
use command [see Use]
user's subroutines [see Sub]
user's variables [see User Variables]
user_to_cm_x(xuser) subroutine [see Builtin functions that take one argument]
user_to_cm_y(yuser) subroutine [see Builtin functions that take one argument]
variable interpolation in quoted strings [see Variable Interpolation In Quoted Strings]
variables, making local to a block [see My]
variables, reading [see Read variable]
variables, system [see System Variables]
variables, user [see User Variables]
variables, vector and scalar with same name [see User Variables]
vector variables [see User Variables]
version() subroutine [see Builtin functions that take no arguments]
version() [see Builtin functions that take no arguments]
version, how to determine with -v commandline option [see Commandline options]
warn command [see Warn]
warning, printing [see Warn]
warnings, how to control with -t commandline option [see Commandline options]
web-based file access [see Open]
while loop <1> [see While and Until]
while loop [see Loops]
while, trailing [see While and Until]
width of text [see Builtin functions that take one argument]
x axis, setting [see Set x axis]
x, name of axis [see Set x name]
x, setting length axis [see Set x size]
x-axis, setting type [see Set x type]
x-y graphs [see Draw curve]
x11 colordatabase [see Set color]
y axis, setting [see Set y axis]
y, name of axis [see Set y name]
y, setting length axis [see Set y size]
y-axis, setting type [see Set y type]
zapfChancery font [see Set font to]
_ character in numerical constants [see Underline convention in numerical constants]
||, boolean 'or' operator [see Comparison operators]
~/.grerc file [see User startup file]

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Gre / Dan E. Kelley