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Full Discussion: Grabbing value from command output and monitoring for changes
Top Forums Shell Programming and Scripting Grabbing value from command output and monitoring for changes Post 302447622 by monty77 on Monday 23rd of August 2010 09:38:17 PM
Old 08-23-2010
Quote:
Originally Posted by agama
Good -- a single shot command is much easier to deal with.

I miss read the grep -- realise now that you are ditching the 'name' line. If the value that you are interested in is always the last line, which it appears to be, then this will be better:

Code:
echo "psc -i 10050 -s RELOAD_SERVICE" | tmadmin | grep -vE 'Name|------' | tail -1| read new_value;

If there is more output following the value you want, but it is always line seven, then try this:
Code:
echo "psc -i 10050 -s RELOAD_SERVICE" | tmadmin | grep -vE 'Name|------' | awk 'NR==7 {print}' | read new_value;

Have a go with one of these and see if that works.
Thanks again, either one of those might work but I went with this in the end:

Code:
echo "psc -i 10050 -s RELOAD_SERVICE" | tmadmin | grep -vE 'Name|------|'^$'' | awk '{print $7}'

..only thing that's not perfect now is that it (understandably) will always write a row to the log when you first fire it up. Any way to avoid this?

Thanks a million!!
Monty
 

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LEARN ABOUT HPUX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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