Note that this is not implemented at present on grendel and bluecrystalp1- the quota command will produce no output. It is included here for reference.
Often people are allocated a certain amount of disk space on the file system for their personal files, usually about 100Mb. If you go over your quota, you are given 7 days to remove excess files.
To check your current quota and how much of it you have used, type
$ quota -v
The df command reports on the space left on the file system. For example, to find out how much space is left on your current filesystem, type
$ df .
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
This reduces the size of a file by compressing it, and renames it to eg science.txt.gz . 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 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 *
The bash 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 bash 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)
M.Stonebank@surrey.ac.uk, © 24th August 2001