Appendix B. Quick Guide to sed and gawk
If you do any type of data handling in your shell scripts, most likely you'll need to use either the sed or gawk programs (and sometimes both). This appendix provides a quick reference for sed and gawk commands that come in handy when working with data in your shell scripts.
The sed Editor
The sed editor can manipulate data in a data stream based on commands you either enter into the command line or store in a command text file. It reads one line of data at a time from the input and matches that data with the supplied editor commands, changes data in the stream as specified in the commands, then outputs the new data to
Starting the sed editor
The format for using the
sed command is:
options script file
The options parameters allow you to customize the behavior of the
sed command, and include the options shown in Table B-1.
The script parameter specifies a single command to apply against the stream data. If more than one command is required, you must use either the
-e option to specify them in the command line or the
-f option to specify them in a separate file.
Table B.1. The sed Command Options
Add commands specified in script to the commands run while processing the input.
Add the commands specified in the file file to the commands run while processing the input.
Don't produce output for each command, but wait for the print command.
The sed editor script contains commands that sed processes ...