The package bash-completion extends this by adding more specialized tab completions for common commands and their options, which can be enabled by sourcing /usr/share/bash-completion/bash_completion (which has been already sourced in Arch's /etc/bash.bashrc). To reduce the needed number of tab-presses, see Readline#Faster completion.īy default, Bash only tab-completes commands, filenames, and variables. It may require up to three tab-presses to show all possible completions for a command. Tab completion is the option to auto-complete typed commands by pressing Tab (enabled by default). Last, but not least, it allows you to create macros. It is also Readline's responsibility to manage history of input commands. moving back and forth on the word basis, deleting words etc. Readline provides emacs and vi styles of shortcuts for interacting with the command line, i.e. See Environment variables for more general information.īash command line is managed by the separate library called Readline. These shell variables in Bash can be exported in order to become environment variables:Įnvironment variables are conventionally placed in ~/.profile or /etc/profile so that other Bourne-compatible shells can use them. When a new shell or script is launched it inherits its parent's variables, thus starting with an internal set of shell variables. Environment variables are used to store useful values such as command search directories, or which browser to use. The behavior of Bash and programs run by it can be influenced by a number of environment variables. See GregsWiki:ProcessManagement#On processes, environments and inheritance for details. While interactive, non-login shells do not source ~/.bash_profile, they still inherit the environment from their parent process (which may be a login shell).Login shells can be non-interactive when called with the -login argument.Sources /usr/share/bash-completion/bash_completion. After exit of a login shell.ĭepends on the -DSYS_BASHRC="/etc/bash.bashrc" compilation flag. The skeleton file /etc/skel/.bash_profile also sources ~/.bashrc.ĭepends on the -DSYS_BASH_LOGOUT="/etc/bash.bash_logout" compilation flag. If this file does not exist, ~/.bash_login and ~/.profile are checked in that order. Sources application settings in /etc/profile.d/*.sh and /etc/bash.bashrc. See the Bash Startup Files section of the GNU Bash manual for a complete description. ![]() Configuration filesīash will attempt to execute a set of startup files depending on how it was invoked. If Bash is invoked with the name sh, it tries to mimic the startup behavior of historical versions of sh, including POSIX compatibility. Note: In Arch /bin/sh (which used to be the Bourne shell executable) is symlinked to bash. All interactive shells source /etc/bash.bashrc and ~/.bashrc, while interactive login shells also source /etc/profile and ~/.bash_profile. ![]() This mode can also be engaged using the -l/ -login command line option.īash is considered an interactive shell when its standard input, output and error are connected to a terminal (for example, when run in a terminal emulator), and it is not started with the -c option or non-option arguments (for example, bash script). If Bash is spawned by login in a TTY, by an SSH daemon, or similar means, it is considered a login shell. Some descriptions of different modes follow. Bash can be run on most UNIX-like operating systems, including GNU/Linux.īash is the default command-line shell on Arch Linux.īash behaviour can be altered depending on how it is invoked. Its name alludes to its predecessor, the long-deprecated Bourne shell. ![]() Bash (Bourne-again Shell) is a command-line shell/programming language by the GNU Project.
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