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Setting a variable in a while loop (.ksh script)

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Top Forums Shell Programming and Scripting Setting a variable in a while loop (.ksh script)
# 1  
Old 07-08-2011
Setting a variable in a while loop (.ksh script)
Hello Everyone,

I'm still trying to grasp many concepts in .ksh scripting, one of them being variables inside loops. My problem is the following:

* I'm trying to set a variable inside a while read loop to reuse it outside of said loop. My lines are the following :
Code:
file="/home/jpassema/purge_/appli"

IFS="&"
cat $file | while read UPROC REP_CIBLE LIST_REP_SOURCE
do
        if [ "$UPROC" = "$uproc_cible" ]; then
                (( rep_cible=$REP_CIBLE ))
                (( liste_rep_sources=$LIST_REP_SOURCE ))
        fi
done

echo "repertoire cible = $rep_cible"

basically i'm trying to read a file until i find the line designated by the value "uproc_cible" and setting the contents of the colums on that line to script-wide variables.

I believe that loops run as parrallel processes, which may be the source of my problem.

Thanks in advance for any pointers

Jimmy
Last edited by Franklin52; 07-08-2011 at 02:06 PM.. Reason: Please use code tags
# 2  
Old 07-08-2011
Code:
IFS="&" ; grep "^${uproc_cible}" yourfile | read  uproc rep_cible liste_rep_sources

this should work, but it's untested
# 3  
Old 07-08-2011
Hi Funksen,

Thanks for your prompt reply.
As i undestand it, this command will find the line identified by "uproc_cible" and set the variables : uproc, rep_cible, liste_rep_sources with the values in that line.

stop me if i'm wrong....Smilie

---------- Post updated at 10:36 AM ---------- Previous update was at 10:30 AM ----------

Here is the modification I made following your recommendation :

Code:
IFS="&" ; grep "${uproc_cible}" $file | read  uproc rep_cible liste_rep_sources

echo $uproc
echo $rep_cible

and this is the output:

Code:
+ file=/home/jpassema/purge_/appli
+ IFS=&
+ grep uproc1 /home/jpassema/purge_/appli
+ read uproc rep_cible liste_rep_sources
+ echo

+ echo

perhaps i goofed up the syntax??
Last edited by Franklin52; 07-08-2011 at 02:07 PM.. Reason: Please use code tags
# 4  
Old 07-08-2011
Try this..

Code:
 
file="/home/jpassema/purge_/appli"
rep_cible=""
IFS="&"
cat $file | while read UPROC REP_CIBLE LIST_REP_SOURCE
do
if [ "$UPROC" = "$uproc_cible" ]; then
(( rep_cible=$REP_CIBLE ))
(( liste_rep_sources=$LIST_REP_SOURCE ))
fi
done
echo "repertoire cible = $rep_cible"

# 5  
Old 07-08-2011
hm looks good, but since you want to find the content of uproc_cible in the first column, you'll need the
Code:
^

in the grep, this indicates the beginning of the line

but this has nothing to do with your problem, since the variables should contain anything

the read syntax will not work in sh or bash, just in ksh

maybe give a short example of the content of uproc_cible and the file


possible issue could be, that the search string cannot be found in the file, case problem perhaps? use grep -i to ignore case
# 6  
Old 07-08-2011
Hi Itkamaraj,

I have tried your solution, here is the output:
Code:
file=/home/jpassema/purge_/appli
+ rep_cible=
+ IFS=&
+ cat /home/jpassema/purge_/appli
+ read UPROC REP_CIBLE LIST_REP_SOURCE
+ [ uproc1 = uproc1 ]
+ let  rep_cible=uproc1_rep_source
+ let  liste_rep_sources=rep_source1|rep_source2|rep_source3
+ read UPROC REP_CIBLE LIST_REP_SOURCE
+ [ uproc2 = uproc1 ]
+ read UPROC REP_CIBLE LIST_REP_SOURCE
+ echo repertoire cible =
repertoire cible =

Last edited by Franklin52; 07-08-2011 at 02:08 PM.. Reason: Code tags
# 7  
Old 07-08-2011
Code:
 
file="/home/jpassema/purge_/appli"
rep_cible=""
IFS="&"
cat $file | while read UPROC REP_CIBLE LIST_REP_SOURCE
do
if [ "$UPROC" = "$uproc_cible" ]; then
echo $REP_CIBLE   # to check the value
rep_cible=$REP_CIBLE
liste_rep_sources=$LIST_REP_SOURCE
fi
done

echo "repertoire cible = $rep_cible"
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