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Full Discussion: How to know the status of a Command?
Top Forums UNIX for Dummies Questions & Answers How to know the status of a Command? Post 302386411 by Corona688 on Tuesday 12th of January 2010 11:20:53 AM
Old 01-12-2010
Every UNIX process gives a return code. Zero means it executed successfully, nonzero means an error of some sort occurred. What nonzero codes mean can be program-specific but nonzero is always supposed to mean an error of some sort.

You can use these codes from shell easily enough:

Code:
touch a
touch b
# cause copy to fail by preventing it writing to b
chmod 000 b

if cp a b
then
        echo "Copied file"
else
        echo "File not copied!"
fi

Or the rather terse way of using boolean operators:
Code:
function die
{
        echo "$@" >&2
        exit 1
}

cp a b || die "Couldn't copy file!"

 

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LEARN ABOUT CENTOS

bos_help

BOS_HELP(8)						       AFS Command Reference						       BOS_HELP(8)

NAME

       bos_help - Displays help for bos commands

SYNOPSIS

       bos help [-topic <help string>+] [-help]

       bos h [-t <help string>+] [-h]

DESCRIPTION

       The bos help command displays the complete online help entry (short description and syntax statement) for each command operation code
       specified by the -topic argument. If the -topic argument is omitted, the output includes the first line (name and short description) of the
       online help entry for every bos command.

       To list every bos command whose name or short description includes a specified keyword, use the bos apropos command.

OPTIONS

       -topic <help string>+
	   Indicates each command for which to display the complete online help entry. Omit the bos part of the command name, providing only the
	   operation code (for example, specify status, not bos status). If this argument is omitted, the output briefly describes every bos
	   command.

       -help
	   Prints the online help for this command. All other valid options are ignored.

OUTPUT

       The online help entry for each bos command consists of the following two or three lines:

       o   The first line names the command and briefly describes its function.

       o   The second line lists aliases for the command, if any.

       o   The final line, which begins with the string "Usage", lists the command's options in the prescribed order. Online help entries use the
	   same symbols (for example, brackets) as the reference pages in this document.

EXAMPLES

       The following command displays the online help entry for the bos status command:

	  % bos help status
	  bos status: show server instance status
	  Usage: bos status -server <machine name> [-instance <server
	  process name>+] [-long] [-cell <cell name>] [-noauth]
	  [-localauth] [-help]

PRIVILEGE REQUIRED

       None

SEE ALSO

       bos(8), bos_apropos(8)

COPYRIGHT

       IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.  It was converted from HTML to POD by software written by Chas
       Williams and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.

OpenAFS 							    2012-03-26							       BOS_HELP(8)
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