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 ...

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 “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 ...