[linux]shell script add zero padding

shell script中怎麼在數字前補上位數的零呢?

for i in $(seq -f "%05g" 10 15)
do
  echo $i
done

will produce the following output:

00010
00011
00012
00013
00014
00015

aa

More generally, bash has printf as a built-in so you can pad output with zeroes as follows:

$ 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

numbers - Zero Padding In Bash - Stack Overflow
http://stackoverflow.com/questions/8789729/zero-padding-in-bash