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Safely Delete
WARNINGDO NOT DELETE THE PATH DIRECTLY. /var/log/journal/ Commands Get Disk Usage journalctl --...
SED
Stream Editor, a stream text processor, authored by Lee E. McMahon. Basic Syntax sed [OPTIONS] 'c...
Regular Expression
Regular Expressions (regex) can be divided into the following categories based on different stand...
Multi-Lines Text
Echo Command Using the -e option can create simple multi-line text. echo -e 'aa\nbb' aa bb He...
GAWK 2
Regular Expression gawk defaults to using ERE mode. Basic Usage First, create the foo text file....
GAWK 1
Gnu Awk Gawk is the GNU version of the text processing tool. In most GNU/Linux distributions, Ga...
Terminal
A terminal is a user interface, while a shell is running inside a terminal. Early Terminals Ear...
Subshell
The definition of Subshell in some books or materials is unclear, and the explanations often cont...
What is Shell
A shell is a command-line interpreter that lets you interact with the operating system by typing ...
Command Type
Builtin Commands Builtin commands are implemented by the Shell itself, they run without starting...