Linux sed command (string editor) [Basic Guide]

The sed command on Linux is a powerful string editor for filtering or editing text strings.

The most common options are:

• -e: Adds a script to the commands to be executed;
• -f file: Adds the content of a file as a script to be executed;
• -r: Uses regular expressions in the script.

Examples:

To replace expressions with others, we use the “s”, with the “/” delimiters, so that the first occurrence is the text to search for, and the second the text that will be replaced. Note that sed will only exchange the first occurrence of each line, and is case-sensitive. The default output of sed will be the terminal.

$ cat file It 
will be hot at night today. The Night is beautiful. 
$ sed s/night/day/ file 
Today will be hot during the day. The Night is beautiful. 

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