Comment out lines matching pattern with Sed
Let's say you've got a file with the following lines:
cat file.txt
leave me alone
leave me alone
comment me out
leave me alone
comment me out also
leave me alone
Comment out the lines that are begging for it:
sed -i '/comment me out/s/^/#/g' file.txt
Voila:
cat file.txt
leave me alone
leave me alone
#comment me out
leave me alone
#comment me out also
leave me alone
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