can someone help me with : Description of environment concepts Description of i/o redirection Description of the process concept , and the differences between background and foreground execution A...

can someone help me with :

Description of environment concepts

Description of i/o redirection

Description of the
process concept, and the differences between
background
and
foreground
execution

A description of the follwowing operations and commands :

• cd- change the current default directory to. If theargument is not present, report the current directory. If the directory does not exist an appropriate error should be reported. This command should also change the PWD environment variable.


• clr - clear the screen.


• dir- list the contents of directory


• environ - list all the environment strings


• echo - display on the display followed by a new line (multiple spaces/tabs may be reduced to a single space)


• help - display the user manual using the more filter


• pause - pause operation of the shell until 'Enter' is pressed


• quit - quit the shell