df
The df command reports
on the space left on the file system. For example, to find out how much
space is left on the fileserver, type
%
df .
du
The du command outputs
the number of kilobyes used by each subdirectory. Useful if you have gone
over quota and you want to find out which directory has the most files.
In your home-directory, type
%
du
compress
This reduces the size
of a file, thus freeing valuable disk space. For example, type
%
ls -l science.txt
and note the size of
the file. Then to compress science.txt, type
%
compress science.txt
This will compress the
file and place it in a file called science.txt.Z
To see the change in
size, type ls
-l again.
To uncomress the file,
use the uncompress command.
%
uncompress science.txt.Z
gzip
This also compresses
a file, and is more efficient than compress. For example, to zip science.txt,
type
%
gzip science.txt
This will zip the file
and place it in a file called science.txt.gz
To unzip the file,
use the gunzip command.
%
gunzip science.txt.gz
file
file classifies the
named files according to the type of data they contain, for example ascii
(text), pictures, compressed data, etc.. To report on all files in your
home directory, type
%
file *
history
The C shell keeps an
ordered list of all the commands that you have entered. Each command is
given a number according to the order it was entered.
%
history (show
command history list)
If you are using the
C shell, you can use the exclamation character (!) to recall commands
easily.
% !!
(recall
last command)
% !-3
(recall
third most recent command)
% !5
(recall
5th command in list)
% !grep
(recall
last command starting with grep)
You can increase the
size of the history buffer by typing
% set
history=100