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ZeroPadding

For file names, it is often quite convenient to pad small numbers with zeros in order to have them all sort nicely. It can be a pain to deal with fig1 fig10 fig 11 fig2 fig3 ... when trying to, say, make an animation. Bash has multiple ways to handle that:

Printf function:

$ i=99
$ printf "%05d\n" $i
00099

You can use the -v flag to store the output in another variable:

$ i=99
$ printf -v j "%05d" $i
$ echo $j
00099

Bash innate handling:

for i in {00001..99999}; do
  echo $i
done
00001
00002
...
09999
...
99999