55 lines
2.5 KiB
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55 lines
2.5 KiB
HTML
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<!--Converted with LaTeX2HTML 96.1-c (Feb 29, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds -->
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<TITLE>The ipcs Command</TITLE>
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<A NAME="tex2html685" HREF="node26.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME="tex2html683" HREF="node22.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME="tex2html677" HREF="node24.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME="tex2html687" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME="tex2html686" HREF="node26.html">The ipcrm Command</A>
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<B>Up:</B> <A NAME="tex2html684" HREF="node22.html">6.4.1 Fundamental Concepts</A>
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<B> Previous:</B> <A NAME="tex2html678" HREF="node24.html">IPC Keys</A>
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<BR> <P>
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<H3><A NAME="SECTION00741300000000000000">The <TT>ipcs</TT> Command</A></H3>
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<P>
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The <TT>ipcs</TT> command can be used to obtain the status of all System V IPC objects.
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The Linux version of this tool was also authored by <EM>Krishna Balasubramanian</EM>.
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<P>
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<P>
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<HR><PRE>ipcs -q: Show only message queues
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ipcs -s: Show only semaphores
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ipcs -m: Show only shared memory
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ipcs --help: Additional arguments</PRE>
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<HR>By default, all three categories of objects are shown. Consider the following sample
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output of <TT>ipcs</TT>:
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<P>
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<P>
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<HR><PRE>------ Shared Memory Segments --------
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shmid owner perms bytes nattch status
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------ Semaphore Arrays --------
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semid owner perms nsems status
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------ Message Queues --------
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msqid owner perms used-bytes messages
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0 root 660 5 1</PRE>
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<HR>Here we see a single message queue which has an identifier of ``0''. It is owned by
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the user <EM>root</EM>, and has octal permissions of <TT>660</TT>, or <TT>-rw-rw--</TT>.
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There is one message in the queue, and that message has a total size of 5 bytes.
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<P>
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The <TT>ipcs</TT> command is a very powerful tool which provides a peek into the kernel's
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storage mechanisms for IPC objects. Learn it, use it, revere it.
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<P>
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<BR> <HR>
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<P><ADDRESS>
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<I>Converted on: <BR>
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Fri Mar 29 14:43:04 EST 1996</I>
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