HOW TO LEFT PAD NUMBERS IN LINUX

There are many ways to left pad numbers in Linux. Usually this seems to be done by adding leading zeros in front of the main number. A few examples of doing this can be seen below:

Using printf

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# left pad with zeros printf "%05d\n" 99 > 00099   # left pad with zeros and other text printf "my-file-name-%05d.txt\n" 99 > my-file-name-00099.txt

Using AWK

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# left pad with zeros using awk echo 99 | awk '{printf "%05d\n", $0}' > 00099

Looping in Bash

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# left pad with zeros bash loop for i in {00001..00005}; do   echo $i done   > 00001 > 00002 > 00003 > 00004 > 00005