Sed

Great reference: http://www.grymoire.com/Unix/Sed.html#uh-0 GOLD: sed 1-liners

• Find foo and replace it with bar on the first line only, edit in place:

sed -i "" "1 s/foo/bar/" <filename>

• Find all lines containing foo and remove those lines from file <filename>:

sed -i '' -e 's/^.*foo.*//' -e '/^$/d' <filename>

sed -i -e '/foo/d' <filename>

• Find ALL instances of foo and replace it with bar within a file <filename>.

sed -i -e 's/foo/bar/' <filename>

• Replace all instances of foo with bar on lines containing baz within file <filename>.

sed -e '/baz/s/foo/bar/' <filename>

• Find ALL instance of foo and replace it with bar within a file <filename>, and create a backup of the original file.

sed -i '.bak' 's/foo/bar/g' <filename>