Bash-Beginners-Guide

Bash Guide for Beginners
Multiple find and replace commands are separated with individual -e options:
sandy ~> sed -e 's/erors/errors/g' -e 's/last/final/g' example
This is the first line of an example text.
It is a text with errors.
Lots of errors.
So much errors, all these errors are making me sick.
This is a line not containing any errors.
This is the final line.
sandy ~>
Keep in mind that by default sed prints its results to the standard output, most likely your terminal window. If
you want to save the output to a file, redirect it:
sed option 'some/expression' file_to_process > sed_output_in_a_file
More examples
Plenty of sed examples can be found in the startup scripts for your machine, which are usually in
/etc/init.d or /etc/rc.d/init.d. Change into the directory containing the initscripts on your
system and issue the following command:
grep sed *
5.3. Non-interactive editing
5.3.1. Reading sed commands from a file
Multiple sed commands can be put in a file and executed using the -f option. When creating such a file,
make sure that:
• No trailing white spaces exist at the end of lines.
• No quotes are used.
• When entering text to add or replace, all except the last line end in a backslash.
5.3.2. Writing output files
Writing output is done using the output redirection operator >. This is an example script used to create very
simple HTML files from plain text files.
sandy ~> cat script.sed
1i\
\
sed generated html\
\
$a\
\
\
sandy ~> cat txt2html.sh
#!/bin/bash
Chapter 5. The GNU sed stream editor 66