Unix utility SED provides an effective and versatile way of deleting one or more lines from a designated file to match the needs of the user. This Unix command is used for command line processing.

The filter sed can process text from standard input and write its results to standard output. The input can be redirected from a file, and the output also can be redirected to a file using your ...

The “l” at the beginning identifies /usr/bin/awk as a symbolic link. NOTE: Without the commas, the result would be “onetwothree”. Note that gawk allows you to ...

A key point to these tools (from a practical point ) is that they are very memory efficient and allow work on just a "line".

The person that has to figure out why your scripts are broken will thank you. It's good to know the syntax of sed/awk for those (hopefully rare) cases where you don't have a more evolved scripting ...