11-17-2008
The reason, as has been mentioned, is that Linux is not a product from one company. It is free, both as in "costs nothing" and also that you are free to change or modify Linux in any way, as long as you provide the technical differences back to the community that gave you the ability to use Linux in the first place.
There are, as such, multiple distributions of Linux. They take the same basics and then package them into distinct operating environments.
Think of it this way. If you were to go to a store and see Maier's Bread, Wonder Bread, Stroehmann bread and "Generic" bread, all containing the same basics of wheat flour, but tasting slightly different due to texture, recipe, etc, you would see that while they may not be necessary, they are distinct and different.
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IPCS(1) User Commands IPCS(1)
NAME
ipcs - provide information on ipc facilities
SYNOPSIS
ipcs [-asmq] [-tclup]
ipcs [-smq] -i id
ipcs -h
DESCRIPTION
ipcs provides information on the ipc facilities for which the calling process has read access.
The -i option allows a specific resource id to be specified. Only information on this id will be printed.
Resources may be specified as follows:
-m shared memory segments
-q message queues
-s semaphore arrays
-a all (this is the default)
The output format may be specified as follows:
-t time
-p pid
-c creator
-l limits
-u summary
SEE ALSO
ipcrm(1), ipcmk(1)
CONFORMING TO
The Linux ipcs utility is not fully compatible to the POSIX ipcs utility. The Linux version does not support the -b and -o options, but
does support the -l and -u options not defined by POSIX. The portable application shall not use the -a, -b, -o, -l, and -u options.
AUTHOR
krishna balasubramanian (balasub@cis.ohio-state.edu)
AVAILABILITY
The ipcs command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux February 2008 IPCS(1)