SED - Stream Editor
The sed
command (short for "stream editor") is a powerful text-processing utility in Linux and other Unix-like operating systems. It is used to perform basic and advanced text transformations on input text files or streams.
The basic syntax of the sed
command is as follows:
sed [options] 'command' input_file
The command
part of the syntax is a series of editing commands that can be used to modify the input text. Some common sed
commands are:
s/pattern/replacement/
: Substitute the first occurrence ofpattern
withreplacement
in each line of the input text.s/pattern/replacement/g
: Substitute all occurrences ofpattern
withreplacement
in each line of the input text.d
: Delete the entire line from the input text.p
: Print the current line (or a specified range of lines) to the standard output.
The input_file
parameter is the name of the file that sed
should process. If no input file is specified, sed
reads from the standard input.
Some common options of the sed
command are:
-i
: Edit files in place (i.e., modify the input file instead of printing the modified output to the standard output).-e
: Specify multiple editing commands.-n
: Suppress automatic printing of input lines.
Example
To replace the word "apple" with "banana" in a file named "fruits.txt", you can use the following command:
sed 's/apple/banana/g' fruits.txt
To edit the file in place, use the -i
option:
sed -i 's/apple/banana/g' fruits.txt