intro_operating_system

			    Operating System Information

	Application program development presently takes place on the Linux
	operating system.

	The most commonly used text editors used here are nedit, emacs, and vi.

	Linux Commands:

	Command					Meaning
	-------------------------------------	----------------------------------------
	dir					display files in the current directory
	-------------------------------------	----------------------------------------
	ls -l					display files in the current directory
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	cd {directory}				move to a different directory
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	cd ..					move to the parent directory
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	cd -					move to the last directory
						you were in
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	pwd					display what the current directory is
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	mkdir {directory}			creates a subdirectory of the current
						directory
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	rmdir {directory}			deletes a subdirectory of the current
						directory
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	cat {file}				displays a file
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	cp {source_file} {dest_file}		copies a file
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	mv {old_file_name} {new_file_name}	renames a file
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	rm {file}				deletes a file
						(file spec can contain wildcards (*))
	--------------------------------------------------------------------------------
	lpr -P {queue} {file}			prints a file
	--------------------------------------------------------------------------------
	pprint -P{queue} {file}			prints a file
	--------------------------------------------------------------------------------
	diff {file1} {file2}			compares two files and displays any
						differences
	--------------------------------------------------------------------------------
	grep {string} {file_spec}		searches file(s) for a string
						(file spec can contain wildcards (*))
	--------------------------------------------------------------------------------
	find . -name {file_spec}		searches directories for files whose
						names match a string
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	ps -aux					shows all processes running on your node
	--------------------------------------------------------------------------------
	ps -U {user name}			shows all processes running on your node
						belonging to a given user
	--------------------------------------------------------------------------------
	date					displays the current system date
						and time
	--------------------------------------------------------------------------------
	rsh -F {node}				allows you to log into another node
	--------------------------------------------------------------------------------
	export {name}={value}			allows you to set an environment
						variable
	--------------------------------------------------------------------------------
	echo ${name}				allows you to display the value of an
						environment variable
	--------------------------------------------------------------------------------