Shell Command Library
Important Note: Shell commands may vary in syntax and usage from one type of shell to another. The shell command library here is provided as general references. Use the man command to see how a command is used in a particular shell.
C Shell Commands and What They Do
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The C shell provides the following built-in commands:
| # | Marks a command. |
| alias | Displays alias. |
| bg | Resumes job in the background. |
| break | Resumes execution after the loop. |
| breaksw | Breaks from a switch command; resumes after the endsw command. |
| case | Defines a label in a switch command. |
| cd | Changes directory. |
| chdir | Changes directory, same as cd. |
| continue | Continues a loop. |
| default | Specifies the default case in a switch. |
| dirs | Displays the directory stack. |
| echo | Writes arguments to the standard output of the shell. |
| eval | Evaluates a command. |
| exec | Executes the command in the current shell. |
| exit | Exits the shell. |
| fg | Brings a job in the foreground. |
| foreach | Specifies a looping control statement and execute a sequence of commands until reaching an end command. |
| glob | Writes arguments to the standard output of the shell, like the echo command, but without the new line. |
| goto | Continues execution after the specified label. |
| hashstat | Displays hash table statistics. |
| history | Displays the history list. |
| if | Executes a command if condition met. |
| jobs | Lists active jobs. |
| kill | Sends a signal to a process. term (terminate) is the default signal. |
|
limit |
Sets or list system resource limits. |
| login | Logs on. |
| logout | Logs out. |
| nice | Changes the priority of commands run in the shell. |
| nohup | Ignores the hangup signal. |
|
notify |
Notifies the user about changes in job status. |
| onintr | Tells the shell what to do on interrupt. |
| popd | Pops the top directory off the directory stack and changes to the new top directory. |
| pushd | Exchanges the top two elements of the directory stack. |
| rehash | Re-computes the hash table of the contents of the directories in the path shell variable. |
|
repeat |
Repeats the execution of a command. |
| set | Displays or set the value of a shell variable. |
| setenv | Sets environment variables. |
| shift | Shifts shell arguments. |
| source | Reads commands from a script. |
|
stop |
Stops a background job. |
| suspend | Stops the current shell. |
| switch | Starts a switch. |
| time | Displays the time used to execute commands. |
| umask | Shows or set file permissions. |
|
unalias |
Removes command alias. |
| unhash | Disables the internal hash table. |
| unlimit | Removes limitations on system Resource. |
| unset | Deletes shell variables. |
| unsetenv | Deletes environment variables. |
| wait | Waits for background jobs to complete. |
|
while …end |
Executes the commands between the while and matching end statements repeatedly. |
| @ | Displays or set the values of all the shell variables. |
