Breaking if-else loop and variety of comparisions Post: 302349064

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Top Forums Shell Programming and Scripting Breaking if-else loop and variety of comparisions Post 302349064 by EAGL� on Monday 31st of August 2009 03:30:21 AM

08-31-2009

Registered User

Breaking if-else loop and variety of comparisions

Hello Friends,

Im trying to write a script to invoke nagios. In order to do this I grep some words that comes from output of some backup scripts. When there is "End-of-tape detected" in directed output logs it should give alarm. First I would like to know if there is any better way to write comparision loops. Second if the alarm condition occurs in a loop there is no need to run the next loops so how can i break loops and end the script right way?

Code:

find . -name ufsdump_output1.txt | xargs egrep "End-of-tape detected" | wc -l > word_count1.txt   
###i used wc-l to detect existance of the words "End-of-tape detected" , i know i could do it with awk but coudlnt be sure###
NUM1 = cat word_count1.txt

if [ $NUM1 = 0 ]; then
echo "TAPE HAS STILL SPACE FOR BACKUP"                  exit 0 
elif [ $NUM1 != 0 ]; then
echo "ATTENTION! EOT REACHED, CHANGE CARTRIDGE!"  exit 2
fi

find . -name ufsdump_output2.txt | xargs egrep "End-of-tape detected" | wc -l > word_count2.txt
NUM2 = cat word_count2.txt

if [ $NUM2 = 0 ]; then
echo "TAPE HAS STILL SPACE FOR BACKUP"                  exit 0 
elif [ $NUM2 != 0 ]; then
echo "ATTENTION! EOT REACHED, CHANGE CARTRIDGE!"  exit 2
fi

find . -name ufsdump_output3.txt | xargs egrep "End-of-tape detected" | wc -l > word_count3.txt
NUM1 = cat word_count3.txt

if [ $NUM3 = 0 ]; then
echo "TAPE HAS STILL SPACE FOR BACKUP"	            exit 0 
elif [ $NUM3 != 0 ]; then
echo "ATTENTION! EOT REACHED, CHANGE CARTRIDGE!"  exit 2
fi

I'd like to find out your thoughts,
thanks by advanced

Last edited by EAGL�; 08-31-2009 at 04:38 AM.. Reason: i deleted a redundant variable in script.

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break

break(1)                                                           User Commands                                                          break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until  loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,  then  break  n  levels.  If  n  is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
           able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
           tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10                                                          17 Jul 2002                                                           break(1)