.bashrc file is locate in the user’s home directory. It contain lots of configurable items which can customize how the bash looks like and how user interactive with bash.
- Aliases could be configured under ‘#User specific aliases and functions’ in the .bashrc file. After add aliases item in the .bashrc file, user need log-off and log-in the system or restart bash by execute ‘bash’ command in the terminal to active the newly added aliases.
Aliases example: alias cls=’clear’ - Bash Prompt could be configured under ‘# Source global definitions’ in the .bashrc file. Environment variable $PS1 which could be change by PS1=’optionsPlusAnything’ is represent the bash prompt. The available options are as following
- \a an ASCII bell character (07)
- \d the date in “Weekday Month Date” format
- (e.g., “Tue May 26”)
- \e an ASCII escape character (033)
- \h the hostname up to the first `.’
- \H the hostname
- \n newline
- \r carriage return
- \s the name of the shell, the basename of $0
- (the portion following the final slash)
- \t the current time in 24-hour HH:MM:SS format
- \T the current time in 12-hour HH:MM:SS format
- \@ the current time in 12-hour am/pm format
- \u the username of the current user
- \v the version of bash (e.g., 2.00)
- \V the release of bash, version + patchlevel
- (e.g., 2.00.0)
- \w the current working directory
- \W the basename of the current working direc-
- tory
- \! the history number of this command
- \# the command number of this command
- \$ if the effective UID is 0, a #, otherwise a
- $
- \nnn the character corresponding to the octal
- number nnn
- \ a backslash
- \[ begin a sequence of non-printing characters,
- which could be used to embed a terminal con-
- trol sequence into the prompt
- \] end a sequence of non-printing characters
- Configure bash shell options with set/shopt
set -o check the current bash shell option setting
set -o bashOption to enable the bashOption
set +o bashOptioon to disable the bashOption
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