Basic Linux Command Example: 


Get help on Linux ulimit Command.


   Linux ulimit command is use to modify shell resource limits on Linux system.  The Linux ulimit command is one of bash shell built in command.  The command example below show how to get ulimit command manual or help on Linux ulimit command using shell command, this help show information on how to use the Linux ulimit command, the ulimit command options and the arguments that can be use with Linux ulimit command.


Get Linux ulimit command help


  Execute help command and the name of Linux command that we want the help file, the example below we execute help command with -m option to get the help for ulimit command using the manpage format.

ulimit linux command

[linux@fedora11 ~]$ help -m ulimit


    ulimit - Modify shell resource limits.



    ulimit [-SHacdefilmnpqrstuvx] [limit]



    Modify shell resource limits.


    Provides control over the resources available to the shell and processes

    it creates, on systems that allow such control.



      -S        use the `soft' resource limit

      -H        use the `hard' resource limit

      -a        all current limits are reported

      -b        the socket buffer size

      -c        the maximum size of core files created

      -d        the maximum size of a process's data segment

      -e        the maximum scheduling priority (`nice')

      -f        the maximum size of files written by the shell and its children

      -i        the maximum number of pending signals

      -l        the maximum size a process may lock into memory

      -m        the maximum resident set size

      -n        the maximum number of open file descriptors

      -p        the pipe buffer size

      -q        the maximum number of bytes in POSIX message queues

      -r        the maximum real-time scheduling priority

      -s        the maximum stack size

      -t        the maximum amount of cpu time in seconds

      -u        the maximum number of user processes

      -v        the size of virtual memory

      -x        the maximum number of file locks


    If LIMIT is given, it is the new value of the specified resource; the

    special LIMIT values `soft', `hard', and `unlimited' stand for the

    current soft limit, the current hard limit, and no limit, respectively.

    Otherwise, the current value of the specified resource is printed.  If

    no option is given, then -f is assumed.


    Values are in 1024-byte increments, except for -t, which is in seconds,

    -p, which is in increments of 512 bytes, and -u, which is an unscaled

    number of processes.


    Exit Status:

    Returns success unless an invalid option is supplied or an error occurs.






    GNU bash, version 4.0.16(1)-release (i386-redhat-linux-gnu)

    Copyright (C) 2009 Free Software Foundation, Inc.

    License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>


[root@fedora11 ~]#


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