perl -i~ -p -e 's/^0/1/' *.txt

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-i changes the files, backups are created with the ~ appended
-p prints each line after applying the code.
The code just replaces 0 at the beginning of a line with 1.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: changing the first number of every line by choroba
in thread changing the first number of every line by jinism

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