checking for non-zero value Post: 302156572

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Top Forums UNIX for Dummies Questions & Answers checking for non-zero value Post 302156572 by Smiling Dragon on Tuesday 8th of January 2008 03:24:05 PM

01-08-2008

Registered User

Quote:

Originally Posted by philplasma

without the back ticks it didn't work, so thanks go to the Smiling Dragon for helping out and thanks joeyg for the attempt. However, it still doesn't work, I get the following as a result:

Code:

" near 0wn operator in arithmetic expression "0

There is no quotation mark present in the sqlplus.out file, though I decided to vi the file and found that there is a ^M character at the end of each line. I should let you know that this is a unix emulator on a windows server. Another thing to mention is that the result in the sqlplus.out file does not start at the first character, sqlplus right justifies the value with the field header - for whatever reason the unix.com forum interface put it to the left. Thanks again for the assistance!

Ah, in that case, we can make the search for 0 on the last line a little more robust, the following will trigger if you get a non-zero exit code but will ignore any non-digit characters on the line. You could add a second grep for a 0 afterwards to confirm it's given an exit code at all but I've left that off in the example below:

Code:

if `tail -1 sqlplus.out | egrep '[1-9]'` ; then ...

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LEARN ABOUT LINUX

zegrep

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)