sed add word to beginning of line
$ sed 's/^/#/' file.txt
#add
#character
#at the
#beginning of
#each linesed add word to beginning of line
$ sed 's/^/#/' file.txt
#add
#character
#at the
#beginning of
#each linesed insert string at beginning of line matching pattern
sed '/PATTERN/ s/./INSERT&/' [FILE]Copyright © 2021 Codeinu
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