How to rename some file of same pattern in shell scripting

Question

I want to write a code is shell scripting which will rename all the files of extension .txt in a current directory to extension .c .Suppose my current directory contains some 10

Answer 1

See man rename. You can rename multiple files providing regexp substitution.

rename 's/\.txt$/.c/' *.txt

If you don't have rename in you system, you can use find:

find . -name '*.txt' | while read FILE; do echo mv "$FILE" "$(echo "$FILE" | sed 's/\.txt$/.c/g')"; done

Remove echo when you verify it does what you want.