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Stream Editor, a stream text processor, authored by Lee E. McMahon. Basic Syntax sed [OPTIONS] 'c...

Regular Expressions (regex) can be divided into the following categories based on different stand...

Echo Command Using the -e option can create simple multi-line text. echo -e 'aa\nbb' aa bb He...

Regular Expression gawk defaults to using ERE mode. Basic Usage First, create the foo text file....

Gnu Awk Gawk is the GNU version of the text processing tool. In most GNU/Linux distributions, Ga...

A terminal is a user interface, while a shell is running inside a terminal. Early Terminals Ear...

The definition of Subshell in some books or materials is unclear, and the explanations often cont...

A shell is a command-line interpreter that lets you interact with the operating system by typing ...

Builtin Commands Builtin commands are implemented by the Shell itself, they run without starting...

The Mysterious ^[[A First, start a new Shell /bin/sh. /bin/sh Then enter the following command,...