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Top Forums Shell Programming and Scripting top's exit code indicates error--is this a bug? Post 302223937 by fabulous2 on Monday 11th of August 2008 07:31:59 PM
Old 08-11-2008
top's exit code indicates error--is this a bug?

This single line of code in a sh script file
Code:
top -b -n 1 -U $USER

causes the script to prematurely exit with an exit code of 1 (i.e. an error) if the script is run with the -e option (e.g. if
Code:
set -e

is executed near the top of the script file).

Alternatively, you can execute it like
Code:
top -b -n 1 -U $USER
topExitCode=$?
if [ "$topExitCode" -ne "0" ]; then
	echo "ERROR: exit code == $topExitCode detected"
	exit $topExitCode
fi

and prove that that top line is the offender.

So why is top generating an error exit code?

I am on box whose uname -a returns
Code:
Linux jellybean 2.6.20-15-generic #2 SMP Sun Apr 15 07:36:31 UTC 2007 i686 GNU/Linux

The man pages top(1): tasks - Linux man page indicate the following BUG:
Quote:
The top command calculates Cpu(s) by looking at the change in CPU time values between samples. When you first run it, it has no previous sample to compare to, so these initial values are the percentages since boot. It means you need at least two loops or you have to ignore summary output from the first loop. This is problem for example for batch mode. There is a possible workaround if you define the CPULOOP=1 environment variable. The top command will be run one extra hidden loop for CPU data before standard output.
So, naturally I tried
Code:
top -b -n 2 -U $USER

as well as
Code:
CPULOOP=1
top -b -n 1 -U $USER

but both of those still fail.

Does anyone know what is going on? Should I file a bug report?
 

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RAKE(1) 						 Ruby Programmers Reference Guide						   RAKE(1)

NAME
rake -- Ruby Make SYNOPSIS
rake [--f Rakefile] [--version] [-CGNPgnqstv] [-D [PATTERN]] [-E CODE] [-I LIBDIR] [-R RAKELIBDIR] [-T [PATTERN]] [-e CODE] [-p CODE] [-r MODULE] [--rules] [variable=value] target ... DESCRIPTION
Rake is a simple ruby(1) build program with capabilities similar to the regular make(1) command. Rake has the following features: o Rakefiles (Rake's version of Makefiles) are completely defined in standard Ruby syntax. No XML files to edit. No quirky Makefile syntax to worry about (is that a tab or a space?). o Users can specify tasks with prerequisites. o Rake supports rule patterns to synthesize implicit tasks. o Flexible FileLists that act like arrays but know about manipulating file names and paths. o A library of prepackaged tasks to make building rakefiles easier. OPTIONS
--version Display the program version. -C --classic-namespace Put Task and FileTask in the top level namespace -D [PATTERN] --describe [PATTERN] Describe the tasks (matching optional PATTERN), then exit. -E CODE --execute-continue CODE Execute some Ruby code, then continue with normal task processing. -G --no-system --nosystem Use standard project Rakefile search paths, ignore system wide rakefiles. -I LIBDIR --libdir LIBDIR Include LIBDIR in the search path for required modules. -N --no-search --nosearch Do not search parent directories for the Rakefile. -P --prereqs Display the tasks and dependencies, then exit. -R RAKELIBDIR --rakelib RAKELIBDIR --rakelibdir RAKELIBDIR Auto-import any .rake files in RAKELIBDIR. (default is rakelib ) -T [PATTERN] --tasks [PATTERN] Display the tasks (matching optional PATTERN) with descriptions, then exit. -e CODE --execute CODE Execute some Ruby code and exit. -f FILE --rakefile FILE Use FILE as the rakefile. -h --help Prints a summary of options. -g --system Using system wide (global) rakefiles (usually ~/.rake/*.rake ). -n --dry-run Do a dry run without executing actions. -p CODE --execute-print CODE Execute some Ruby code, print the result, then exit. -q --quiet Do not log messages to standard output. -r MODULE --require MODULE Require MODULE before executing rakefile. -s --silent Like --quiet, but also suppresses the 'in directory' announcement. -t --trace Turn on invoke/execute tracing, enable full backtrace. -v --verbose Log message to standard output (default). --rules Trace the rules resolution. SEE ALSO
ruby(1) make(1) http://rake.rubyforge.org/ REPORTING BUGS
Bugs, features requests and other issues can be logged at <http://onestepback.org/redmine/projects/show/rake>. You will need an account to before you can post issues. Register at <http://onestepback.org/redmine/account/register>. Or you can send an email to the author. AUTHOR
Rake is written by Jim Weirich <jim@weirichhouse.org> UNIX
November 7, 2012 UNIX
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