Template:Article summary start Template:Article summary text Template:Article summary heading Template:Article summary wiki Template:Article summary wiki Template:Article summary wiki Template:Article summary end This article deals with so-called "core" utilities on a GNU/Linux system, such as less, ls, and grep. The scope of this article includes -- but is not limited to -- those utilities included with the GNU Template:Package Official package. What follows are various tips and tricks and other helpful information related to these utilities. If sections grow too detailed, please split into separate articles.
alias is a command in various shells, such as Bash, which enables a replacement of a word with another string. It is often used for abbreviating a system command, or for adding default arguments to a regularly used command.
grep is a command line text search utility originally written for Unix. The Template:Codeline command searches files or standard input globally for lines matching a given regular expression, and prints them to the program's standard output.
To add it, write the following entry to Template:Filename:
export GREP_COLOR="1;33" alias grep='grep --color=auto'
The variable Template:Codeline is used to specify the output color, in this example a light yellow color.
Although Template:Codeline's man page states that Template:Codeline is deprecated and that Template:Codeline is preferable, this variable does not work as of Template:Package Official version 2.5.4, so use Template:Codeline for now.
less is a terminal pager program used to view the contents of a text file one screen at a time. Whilst similar to other pages such as Template:Codeline and Template:Codeline, Template:Codeline offers a more advanced interface and complete feature-set.
Frequent users of the command line interface might want to install Template:Package Official:
# pacman -S lesspipe
Users may now list the compressed files inside of an archive using their pager:
Template:Codeline also grants Template:Codeline the ability of interfacing with files other than archives; serving as an alternative for the specific command associated for that file-type (such as viewing HTML via Template:Package Official).
ls is a command to list files in Unix and Unix-like operating systems.
alias ls='ls --color=auto'
The next step will further enhance the colored Template:Codeline output; for example, broken (orphan) symlinks will start showing in a red hue. Add the following to Template:Filename and relogin, or source the file:
eval $(dircolors -b)