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Full Discussion: for-while loop issue
Top Forums Shell Programming and Scripting for-while loop issue Post 302446016 by foal_newbie on Tuesday 17th of August 2010 11:38:39 AM
Old 08-17-2010
for-while loop issue
sup experts..i had a script which was bugging me..was hoping someone could point out the issue here

Input file: space separated 2 columns

Quote:
ODS_INTRNL_GRADING ODS_LEGAL_ENTITY
ODS_LD_PLE ODS_PLE
ODS_SECURITY_RECOVERY_RATE ODS_SECURITY
ODS_UTILISATION_NONFM ODS_LEGAL_ENTITY
ODS_UTILISATION_NONFM ODS_PLE
ODS_PERSON_FCLT_RLTN ODS_FACILITY
ODS_PERSON_LGEN_RLTN ODS_LEGAL_ENTITY
ODS_PERSON_LGEN_RLTN ODS_PERSON
I wanted to print out the 2 columns after assigning them to variables ( bascially the same output but iterate through line by line ). The code worked with a while loop but not with a for loop.



Code with for loop:

Code:
for i in `cat tmp.dat `
          do
         c=`echo $i|awk -F " "  '{ print $1 }'`
        p=`echo $i|awk -F " " '{ print $2 }'`
         echo $c,$p
          echo -------
         done

Output ( wrong):

Quote:
ODS_INTRNL_GRADING
ODS_LD_PLE
ODS_SECURITY_RECOVERY_RATE
ODS_UTILISATION_NONFM
ODS_UTILISATION_NONFM
ODS_PERSON_FCLT_RLTN
ODS_PERSON_LGEN_RLTN
ODS_PERSON_LGEN_RLTN,ODS_LEGAL_ENTITY
ODS_PLE
ODS_SECURITY
ODS_LEGAL_ENTITY
ODS_PLE
ODS_FACILITY
ODS_LEGAL_ENTITY
ODS_PERSON
-------
While loop code:

Code:
while read i
        do
         c=`echo $i|awk -F " "  '{ print $1 }'`
        p=`echo $i|awk -F " " '{ print $2 }'`
        echo $c,$p
         echo -------
        done < tmp.dat

Output(correct):

Quote:
ODS_INTRNL_GRADING,ODS_LEGAL_ENTITY
-------
ODS_LD_PLE,ODS_PLE
-------
ODS_SECURITY_RECOVERY_RATE,ODS_SECURITY
-------
ODS_UTILISATION_NONFM,ODS_LEGAL_ENTITY
-------
ODS_UTILISATION_NONFM,ODS_PLE
-------
ODS_PERSON_FCLT_RLTN,ODS_FACILITY
-------
ODS_PERSON_LGEN_RLTN,ODS_LEGAL_ENTITY
-------
ODS_PERSON_LGEN_RLTN,ODS_PERSON
-------

shell /bin/ksh
Linux lonrs00845 2.6.9-42.0.8.ELsmp #1 SMP Tue Jan 23 12:49:51 EST 2007 x86_64 x86_64 x86_64 GNU/Linux


Was hoping someone could tell me why the for loop is printing all first columns first.. followed by the 2nd columns ..but the while loop correctly prints:
col1, col2
col1, col2..etc ( bascially the input file again )

i put in the IFS as "\n" as well..
thanks all ..much appreciated...is not a code as such..something i was trying out and cudnt figure out the cause.
 

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LEARN ABOUT DEBIAN

smd-loop

smd-loop(1)						 Sync Mail Dir (smd) documentation					       smd-loop(1)

NAME

       smd-loop - iterates smd-pull and smd-push

SYNOPSIS

       smd-loop [-vt]

DESCRIPTION

       smd-loop  runs  smd-push and smd-pull at regular intervals as defined by the user in the ~/.smd/loop configuration file. On errors that are
       reported to be transient, it retries a second time before failing.

       The configuration file is line-oriented. Each line is composed of three space separated fields:	pull-frequency,  push-frequency  and  end-
       point-name. Frequencies are expressed in minutes, while endpoint name is a valid name for smd-pull(1) and smd-push(1). Lines beginning with
       # are considered as comments. The following example calls the command smd-pull default every 3 minutes,	and  smd-push  default	every  10.
       Example:

	   # pull-frequency push-frequency endpoint-name
	     3		    10		   default

OPTIONS

       -v     Increase program verbosity (printed on stderr)

       -t     Just create a template configuration file if none

FILES

       ~/.smd/loop

SEE ALSO

       mddiff(1), smd-server(1), smd-client(1), smd-push(1), smd-pull(1)

AUTHOR

       Enrico Tassi <gares@fettunta.org>

								   11 June 2012 						       smd-loop(1)
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