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How i can delete whitespace in each line of file, using bash For instance, file1.txt. Before:
gg g
gg g
t ttt
after:
gg g
gg g
t ttt
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Use sed 's/^ *//g', to remove the leading white spaces. There is another way to remove whitespaces using `sed` command. The following commands removed the spaces from the variable, $Var by using `sed` command and [[:space:]].
You can enable shopt -s extglob and then just use NEWHEAD=${NEWHAED/+( )/ } to remove internal spaces.
s/[[:space:]]//g; – as before, the s command removes all whitespace from the text in the current pattern space.
sed command: The 1st command removes the leading spaces, the second removes the trailing spaces and the last replaces a group of spaces with a single space. The source file itself can be updated by using the -i option of sed.
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
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