Shell Command Librar1.docx by teretdefe


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									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.

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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

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

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         Executes the commands between the while and matching end statements
…end          repeatedly.

@             Displays or set the values of all the shell variables.

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