Linux sed command

sed is a Unix utility that parses and transforms text, using a simple, compact programming language. sed was developed from 1973 to 1974 by Lee E. McMahon of Bell Labs, and is available today for most operating systems. ¹

To remove the line and print the output to standard out: ²

sed '/pattern to match/d' ./infile

To directly modify the file:

sed -i '/pattern to match/d' ./infile

To directly modify the file (and create a backup):

sed -i.bak '/pattern to match/d' ./infile

For Mac OS X and FreeBSD users:

sed -i '' '/pattern/d' ./infile