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Full Discussion: grep'ing a variable that contains a metacharacter ($) with a while loop
Top Forums Shell Programming and Scripting grep'ing a variable that contains a metacharacter ($) with a while loop Post 302434447 by DeCoTwc on Friday 2nd of July 2010 03:02:01 PM
Old 07-02-2010
grep'ing a variable that contains a metacharacter ($) with a while loop
This is driving me crazy, and I'm hoping someone can help me out with this. I'm trying to do a simple while loop to go through a log file. I'm pulling out all of the lines with a specific log line, getting an ID from that line, and once I have a list of IDs I want to loop back through the log and check for the times that this line has happened.

This is what I've got so far.
Code:
awk -F\= '/Asset could not be deleted because it does not exist: asset_id=/ {print $2}' manager.log|head
2_1900071424$41211333
2_1900071424$41211333
2_1900071424$8852047
2_1900071424$8852047
2_1900071552$9216019
2_1900071552$9216019
2_1900071424$9338764
2_1900071552$8026494
2_1900071552$9021614
2_1900071680$8770799

So this gives me a list of asset IDs. The problem is, lets say now I want to loop through the log and grep for these. No matter what I do I can't seem to make it work.

I've tried:

Code:
[root@mgmt01 logs]# awk -F\= '/Asset could not be deleted because it does not exist: asset_id=/ {print $2}' manager.log|while read i;do grep $i manager.log;done
grep: Unmatched [ or [^
grep: Unmatched [ or [^
grep: Unmatched [ or [^
grep: Unmatched [ or [^
grep: Unmatched [ or [^

But that doesn't work. I tried a bunch of combinations of single and double quotes and that didn't work. I even got creative and tried splitting up each variable into an array and then combining it and grep'ing for that...

Code:
[root@mgmt01 logs]# awk -F\= '/Asset could not be deleted because it does not exist: asset_id=/ {print $2}' manager.log|while read i;do IFS="$";i=($i);grep  ""${i[0]}"$"${i[1]}"" manager.log ;done
grep: Unmatched [ or [^
grep: Unmatched [ or [^
grep: Unmatched [ or [^
grep: Unmatched [ or [^
grep: Unmatched [ or [^

But that didn't work at all either. Frankly, at this point I'm getting a little frustrated. I've actually found a way to get the information I needed, but I'm sure at some point I'm going to want to loop through this log.

Any advice?
 

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LEARN ABOUT SUNOS

continue

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)
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