This page explains some basic UNIX commands. While using UNIX, you can
get help by typing man -k keyword
at the prompt. This lists the
commands relevant to the keyword. There are many good UNIX
books out there, and many people in the lab are pretty UNIX-savy, so ask
around if you have questions. There is also the following
A UNIX pathname specifies where a file is located on the unix system.
This is analogous to a folder on a Mac or PC. An example of a UNIX
path would be "/home/users/sammy", the home directory for the user
Files (such as .dat, .gpr, .sag, .tif, etc. files) are located in
directories. If sammy had a .dat file called 123.dat in his home
directory, it could be refered to in Unix by its full path,
"/home/users/sammy/123.dat". The full path is basically an
unambiguous address for a file or directory.
- cd pathname changes your current directory to the
pathname you specified.
- ls lists the files in your current directory.
- dir lists the files in your current directory. It also provides
the username of the person who last updated the file
and when it was last updated. To get back to the UNIX prompt, hit 'q.'
- cp filename new pathname copies a file from your current
directory to the directory specified by the pathname. A copy of the
file will remain in your current
directory. cp will overwrite any file in the same name in the
directory to which you are copying, so be sure that this is not the
situation before you use cp. Once a file is overwritten, it cannot be recovered.
- rm filename removes the specified file from your current directory. Once a
file has been removed, that copy can no longer be accessed. Make sure
you no longer need this file or have copied it elsewhere before using
the rm command. Unix will ask you to confirm this command before
- gzip filename compresses a file. It will take up less
space, but it cannot be read in this format. After gzip, files carry
the suffix ".gz"
- gunzip filename uncompresses any file with a ".gz" suffix and
removes the suffix.
- more filename allows you to view the contents of
a file in your current directory. To view the next screen, hit the
space bar. To get back to the UNIX prompt, hit 'q.'
- lpr filename prints the specified file.