This document contains information that should be useful to students taking classes with me at the SCI at Rutgers University. Please send your corrections and suggestions

UNIX Commands

This is a quick reference sheet for A Few Good UNIX Commands. These commands will help you when working on the scils.rutgers.edu UNIX host. During this fall class, I will continue to add commands as needed. Should you wish to add commands, please email me your requests.

UNIX File System Tricks

• pwd(cr) --- present working directory
• ls(cr) --- short listing of current directory
• ls -l(cr) --- long listing of current directory
• ls -a(cr) --- listing of all files, including .file, in current directory
• ls -al(cr) --- long listing of all files in current directory
• ls [pathname](cr) --- short listing of pathname
• ls -l [pathname](cr) --- long listing of current directory
• cd(cr) --- change to user home directory
• cd [pathname](cr) --- change to directory in pathname
• cp [pathname/file] [pathname] --- copy file to directory in 2nd pathname
• mv [pathname/file] [pathname] --- move file to directory in 2nd pathname
• mv [pathname/file] [pathname] --- move can also be used to rename a file
• rm pathname/file --- remove (delete) file
• rmdir pathname --- remove directory
• chmod 755 filename --- set permissions rwx for owner and r-x for everyone else

UNIX Tricks

• hostname(cr) --- print name of UNIX machine (e.g., scils)
• who(cr) --- listing of who is logged into the system
• cat [file or pathname/file](cr) --- dump complete contents of file onto screen
• more [file or pathname/file](cr) --- dump a screen full of contents of file then use for next screen full or the (cr) for next line from file until EOF (end of file)
• grep charString [file](cr) --- find each line in file containing the charString
• whereis [file](cr) --- try to find pathname location for file
• clear(cr) --- clear the screen
• date(cr) --- print current date
• man [UNIX command](cr) --- print manual page for UNIX command
• echo foo(cr) --- print the contents of foo - foo can be a string or variable

UNIX User Environment Variables

• echo $PATH --- show all user Environment pathnames to executable programs
• echo $HOME --- show name of user home directory
• echo $TERM --- show user Environment terminal type

UNIX Communication Commands

• finger riecken@scils.rutgers.edu(cr) --- command to find a person at a given "host"
• telnet scils.rutgers.edu(cr) --- set up terminal session with $TERM=vt100 at a given "host"
• rlogin scils.rutgers.edu(cr) --- remote login into a given "host"
• ftp scils.rutgers.edu(cr) --- file transport protocol program to connect 2 "hosts" and transfer files

UNIX ksh Tricks

• (Esc) --- enter history list
• (Esc) --- when in history list escape from history list
• k --- when in history list go back one comment from current position in list
• j --- when in history list go forward one comment from current position in list
• (cr) --- when in history list execute current command
• (Esc)(cr) --- escape history list and then execute current command
• /charString --- when in history list find last command containing charString - note when string has been found then use (Esc) to exit history list and then use UNIX vi Editor commands to edit charString