Delete whitespace in each begin of line of file, using bash

linux bash whitespace removing-whitespace

sed -i 's/ //g' your_file will do it, modifying the file inplace.

To delete only the whitespaces at the beginning of one single line, use sed -i 's/^ *//' your_file

In the first expression, we replace all spaces with nothing.In the second one, we replace at the beginning using the ^ keyword

linux bash whitespace removing-whitespace

`tr`(delete all whitespaces):

$ tr -d ' ' <input.txt >output.txt$ mv output.txt input.txt

$ sed -i 's/^ *//' input.txt

linux bash whitespace removing-whitespace

use can use perl -i for in place replacement.

perl -p -e 's/^ *//' file