How to compare two files ?

To compare two files, reporting all discrepancies.


$ cmp file1 file2

How to compare two files ?

To compares two files, reporting all discrepancies. Similar to the cmp command, though the output format differs.



$ diff file1 file2

How to place the current job in the background ?

 To place the current job (or, by using the alternative form, the specified jobs) in the background, suspending its execution so that a new user prompt appears immediately. Use the jobs command to discover the identities of background jobs.



    $ bg
    $ bg jobs

How to cancel the execution of a job scheduled ?

To cancel the  execution of a job scheduled via the 'at' command. Use the atq command to discover the identities of scheduled jobs.


$ atrm job

Which are the jobs pending ?

Prints descriptions of jobs pending via the 'at' command.


$ atq

How to search the manual pages of the specified keyword?

To search the manual pages for occurrences of the specified keyword and prints short descriptions from the beginning of matching manual pages.


$ apropos keyword

Some MS-DOS commands & related linux commands

How to find the disk space used by the current directory

To print the amount of the disk space used by the current directory

~$ du /directory

How to find free disk space in each mounted filesystem

To print the amount of free disk space in each mounted file system

~$ df