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Full Discussion: assign multiple rows value to a variable using eval
Top Forums Shell Programming and Scripting assign multiple rows value to a variable using eval Post 302641655 by bakunin on Wednesday 16th of May 2012 11:14:01 AM
Old 05-16-2012
Quote:
Originally Posted by black_fender
The problem I have now is that I want to assign to this variable a multiple row value and I get the error you see above ("pp" is the word from the second row from $metresult value.
This is the culprit. The "eval" sends the line through the evaluation process a second time, but the first time it has already eaten away your quotation and this second time the newline terminates the line. You have to escape the quotation to protect it for the correct evaluation pass to interpret it.

Notice the difference between:

Code:
echo "abc"                # evaluated once, but the "" are missing in the output
echo "\"abc\""            # evaluated once, the inner "" are there, without escaping
eval echo "\"abc\""       # second evaluation ate the second pair of ""
eval echo "\\"abc\\""     # two evaluations need two-time escaped quoations

I hope this helps.

bakunin
Last edited by bakunin; 05-16-2012 at 12:19 PM..
This User Gave Thanks to bakunin For This Post:
black_fender
 

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LEARN ABOUT DEBIAN

gong

GONG(1) 						      General Commands Manual							   GONG(1)

NAME

       gong - evaluate process performance

SYNOPSIS

       gong [-f] [-a] process-id

DESCRIPTION

       Gong is used to evaluate the performance of a process that is in execution.

       The  process-id	is  the process number of the process whose performance is to be evaluated.  The evaluation is performed by a set of three
       ``panelist'' routines, each of which analyzes one aspect (time, space, and tonality) of the performance of the process.	If  any  of  these
       routines is not amused by the performance, the process being analyzed is sent the gong(2) signal.  In addition, the process-id of the eval-
       uated process is written on the standard gong, for possible future corrective action.  (It is suggested that the standard gong be an  audi-
       ble alarm for proper effect.)  It is expected that after being gong(2)ed, the process will promptly commit suicide.

       The  -f	keyletter  argument  indicates	that  gong  is	to  invoke flog(1) with the unmerciful argument if the process does not respond to
       gong(2)ing.  In the absence of this argument, the process is continuously gong(2)ed, which may lead to the process becoming a deaf zombie.

       The -a keyletter argument indicates that if all three of the panelist routines gong(2)  a  process,  the  process  should  be  unmercifully
       flog(1)ged whether or not the -f keyletter is supplied.

FILES

       /dev/ding.dong is the standard gong.

SEE ALSO

       On  the	Applicability  of  Gonging to the Performance and Merit Review Process, Journal of Irreproducible Results, vol. 263, issue 19, pp.
       253-307.

BUGS

       If the named process does not exist, it is possible that gong will attempt an evaluation of itself, which may lead to a condition known	as
       compounded double ringing (see echo(1)).  Therefore, it is recommended that gong be used with extreme care.

																	   GONG(1)
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