- by x32x01 ||
List of All Bash Inbuilt Variables
Bash is the standard shell on most Linux distributions. However, there are other Linux shells available and there’s no requirement that Bash should be present on any particular distribution.The Bash shell is open source software released under the GNU Pubic License (GPL). If you need to install Bash, the C language source code is freely available from the Free Software Foundation at http://www.gnu.org or through one of its download mirrors.
The Bash shell comes with various built-in help command to describe the various built-in Bash commands. The -s switch displays a summary for the command you specify.
| alias | Define an alias for the specified command. |
| bg | Resume a job in background mode. |
| bind | Bind a keyboard sequence to a readline function or macro. |
| break | Exit from a for, while, select, or until loop. |
| builtin | Execute the specified shell built-in command. |
| cd | Change the current directory to the specified directory. |
| caller | Return the context of any active subroutine call. |
| command | Execute the specified command without the normal shell lookup. |
| compgen | Generate possible completion matches for the specified word. |
| complete | Display how the specified words would be completed. |
| continue | Resume the next iteration of a for, while, select, or until loop. |
| declare | Declare a variable or variable type. |
| dirs | Display a list of currently remembered directories. |
| disown | Remove the specified jobs from the jobs table for the process. |
| echo | Display the specified string to STDOUT. |
| enable | Enable or disable the specified built-in shell command. |
| eval | Concatenate the specified arguments into a single command, then execute the command. |
| exec | Replace the shell process with the specified command. |
| exit | Force the shell to exit with the specified exit status. |
| export | Set the specified variables to be available for child shell processes. |
| fc | Select a list of commands from the history list. |
| fg | Resume a job in foreground mode. |
| getopts | Parse the specified positional parameters. |
| hash | Find and remember the full pathname of the specified command. |
| help | Display a help file. |
| history | Display the command history. |
| jobs | List the active jobs. |
| kill | Send a system signal to the specified process ID (PID). |
| let | Evaluate each argument in a mathematical expression. |
| local | Create a limited-scope variable in a function. |
| logout | Exit a login shell. |
| popd | Remove entries from the directory stack. |
| printf | Display text using formatted strings. |
| pushd | Add a directory to the directory stack. |
| pwd | Display the pathname of the current working directory. |
| read | Read one line of data from STDIN and assign it to a variable. |
| readonly | Read one line of data from STDIN and assign it to a variable that can’t be changed. |
| return | Force a function to exit with a value that can be retrieved by the calling script. |
| set | Set and display environment variable values and shell attributes. |
| shift | Rotate positional parameters down one position. |
| shopt | Toggle the values of variables controlling optional shell behavior. |
| suspend | Suspend the execution of the shell until a SIGCONT signal is received. |
| test | Return an exit status of 0 or 1 based on the specified condition. |
| times | Display the accumulated user and system. |
| trap | Execute the specified command if the specified system signal is received. |
| type | Display how the specified word would be interpreted and used as a command. |
| ulimit | Set a limit on the specified resource for system users. |
| umask | Set default permissions for newly created files and directories. |
| unalias | Remove the specified alias. |
| unset | Remove the specified environment variable or shell attribute. |
| wait | Wait for the specified process to complete, and return the exit status. |