UNIX QUICK SHEET (Basic Commands)

			Quick Unix

DISPLAYING AND MANIPULATING DATA
 cat  {file}            copy file(s) to StdOut 
                         - listing to screen
 more {file}		display file(s) on StdOut, one screenful 
			at a time.
			 - listing to the screen
 crypt                  encrypt or decrypt StdIn to StdOut
                         - make files no one else can read
 echo {string}          write strings to StdOut
                         - same as in DOS
 egrep  pattern {file}  find pattern, allows regular expressions
 fgrep  pattern {file}  find pattern, fixed string only
 grep   pattern {file}  find pattern, allows extended wildcards
 tee file               copy StdIn to StdOut and to file
                         - whatever you're doing goes to file and screen
 wc  {file}             count lines, words, and characters in file

MAINTAINING FILES AND DIRECTORIES 
 chmod ugo+rwx  file    change file attributes (+ could also be -)
 cp src dest            copy files
 ls {filespec}          list files
                         - -l long listing
                         - -a all including hidden files
                         - -F symbols at the end of file names indicating
                              directories, executables, etc.
                         - -C show in columns
 mkdir dir               create a directory
 mv src dest             move or rename files
 rm file                 remove files
                          - -r remove recursively i.e. delete all
                               subdirectories and their contents 
 rmdir path              remove directories
                          - directory must be empty.  if it is not, and you
                            want to remove it and its contents use 'rm -r dir'
 touch file              update date-time-stamp or create a file

SHELL PROGRAMMING - more on this when you want to go wild
 exit                    finish a script
 sleep [-s] Time         wait for a while
 test [expr]             evaluate a logical expression
 true                    returns 1

SHELL AND SYSTEM MANAGEMENT AND CONFIGURATION
 alias name string       set up a shell function
 date                    show time and date
 df                      disk space info
 du -k                   disk usage info & directory tree
                          - -k show in kilobytes. this is the best way
 exit                    finish the shell. just like logout
 set                     like setenv but mostly for sh
 setenv name             set an environmental variable.  used in csh
 time                    does not give time!  is used to time how long
                           a task has been running
 unalias name            same as unset
 unset name              delete shell functions
 unsetenv name           same as unset

SHELL AND SYSTEM MONITORING
 alias                   by itself lists aliases
 env                     show the shell's environment
                         - printenv and setenv without parameters are 
                           the same
 set                     by itself shows environment variables
 history                 show the history list

UTILITIES
 compress                compress a file filename -> filename.Z
 find path -name filename -print
                         list matching files
 man [command]           online help
 sort                    sort StdIn to StdOut
                          - see man pages for switches
 tar                     tape archiver
                          - to untar a file 'tar xvf filename'
                          - to tar a directory 'tar cvf file directoryname'
 uncompress              uncompress file filename.Z -> filename
 w                       who is on and what are they doing

MISCELLANEOUS
 cd [path]               change work directory
 clear                   clear the screen
 pwd                     print work directory
 
SUPER SLICK
 to untar a compressed file without decompressing first
         zcat filename.tar.Z | tar xvf -

EXTENDED WILDCARDS:
 *                       matches anything
 ?                       matches one character
 [xyz]                   matches x, y, or z
 [x-z]                   matches x, ..., z

I/O REDIRECTION:
 <                       redirect StdIn
 >                       redirect StdOut, create
 >>                      redirect StdOut, append
 >>&			 redirect StdErr, append
 |                       pipe