Unix helpers
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sed
Mostly perfect:
Add a line into a given script
sed -i '/"Text in the line before"/s@"Text in the line before"@&\n\tNEW_TEXT_IN_LINES_AFTER@' \ /etc/yourscript
Mostly perfect:
Add a line into a given script
sed -i '/"Text in the line before"/s@"Text in the line before"@&\n\tNEW_TEXT_IN_LINES_AFTER@' \ /etc/yourscript