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Full Discussion: grep to handle a 0 result
Top Forums UNIX for Dummies Questions & Answers grep to handle a 0 result Post 302105871 by ocelot on Monday 5th of February 2007 09:43:29 AM
Old 02-05-2007
I have tried grep -c but that doesnt work either, it keeps on dumping out.

The script is actually a TCL script with embedded UNIX commands. The part its failing on is like so:

set td [exec grep -c "InvalidMessage" $logdir/$t | wc -l]

(I have assigned the variables logdir and t from before)

and i run the script and this occurs:

child process exited abnormally
while executing
"exec grep -c "InvalidMessage" $logdir/$t | wc -l"


It happens because there are no "InvalidMessage" strings in the file, but I know this and want the result i.e. 0 to be assigned to td
 

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AMTOC(8)						      System Manager's Manual							  AMTOC(8)

NAME
amtoc - generate TOC (Table Of Contents) for an Amanda run SYNOPSIS
amtoc [ -a ] [ -i ] [ -t ] [ -f file ] [ -s subs ] [ -w ] [ -- ] logfile DESCRIPTION
Amtoc generates a table of contents for an Amanda run. It's a perl script (if you don't have perl, install it first!). OPTIONS
-a The output file name will be label-of-the-tape.toc in the same directory as logfile. -i Display help about amtoc. -t Generate the output in tabular form. -f file Write the output to a file ('-' for stdout). -s subs Evaluate the output file name from subs, with $_ set to label-of-the-tape. The -a option is equivalent to -s 's/$_/.toc/'. -w Separate tapes with form-feeds and display blank lines before totals. -- Marks the last option so the next parameter is the logfile. logfile (use '-' for stdin) OUTPUT FORMAT
The standard output has five fields separated by two spaces: # Server:/partition date level size[Kb] 0 daily-05: 19991005 - - 1 cuisun15:/cuisun15/home 19991005 1 96 2 cuinfs:/export/dentiste 19991005 1 96 ... 103 cuisg11:/ 19991005 0 4139136 103 total: - - 16716288 In tabular format (-t), this would look like: # Server:/partition date lev size[Kb] 0 daily-05: 19991005 - - 1 cuisun15:/cuisun15/home 19991005 1 96 2 cuinfs:/export/dentiste 19991005 1 96 ... 103 cuisg11:/ 19991005 0 4139136 103 total: - - 16716288 USAGE
The easiest way to use it is to run amtoc right after amdump in the cron job: amdump DailySet1 ; logdir=`amgetconf DailySet1 logdir` ; log=`ls -1t $logdir/log.*.[0-9] | head -1` ; amtoc -a $log which will generate /etc/amanda/DailySet1/tape_label.toc. You may also want to call amtoc after an amflush. SEE ALSO
amanda(8), amdump(8), amflush(8), amgetconf(8), cron, perl AUTHOR
Nicolas MAYENCOURT <Nicolas.Mayencourt@cui.unige.ch> University of Geneva/Switzerland AMTOC(8)
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