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Variable changes after a loop

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# 1  
Old 02-24-2011
Data Variable changes after a loop
Hi, I am a beginner with shell programming:
the code is following:

Code:
#!/usr/bin/ksh

v_res="start"
echo "v_res_begin="$v_res

grep -E "#FlatFiles" "a.log" | while IFS= read vLine
do

  set -- $vLine

  v_res="error"

  # there is some code ... if error then break


  echo "v_res_loop1="$v_res
  v_res="ok"
  echo "v_res_loop2="$v_res

done

echo "v_res_after_loop="$v_res


file a.log:
Code:
*************** Start of Group read and Group insert log ***************

#FlatFiles 10001 17487 test1.ctl test1.bad 12944
#FlatFiles 10001 17488 test1.ctl test1.bad 18119
#FlatFiles 10001 17489 test1.ctl test1.bad 11526

result:

Code:
v_res1=start
v_res2=ok
v_res1=error
v_res2=ok
v_res1=error
v_res2=ok
v_res_after_loop=error

This script was working on AIX, now it is on READHAT. I found out (google), that if pipe is used than it is in different scope and global parameters are not set ... but I do not undestand what does it really mean, and how can I fix the code.

Thank for Your help, regards,
Laci
Last edited by pludi; 02-24-2011 at 03:46 PM..
# 2  
Old 02-24-2011
The problem is inside of:
Code:
  # there is some code ... if error then break

Without seeing that part of the code, there is no way to know.
# 3  
Old 02-24-2011
# there is some code ... if error then break

that part does not affect the result ... for test I also deleted it and logically it is not working...
# 4  
Old 02-24-2011
Code:
#!/usr/bin/ksh

v_res="start"
echo "v_res_begin="$v_res

while IFS= read vLine
do


  if [ "${vLine%%${vLine##?}}" != '#' ]; then
     continue
  fi

  set -- $vLine

  v_res="error"

  # there is some code ... if error then break


  echo "v_res_loop1="$v_res
  v_res="ok"
  echo "v_res_loop2="$v_res

done < a.log

echo "v_res_after_loop="$v_res

# 5  
Old 02-25-2011
Bug
vgersh99 - thanks a lot Smilie

I do not really undestand this line - but come up to that it is controlling only the first character of the line - i need to control the first word - #FlatFiles
Code:
if [ "${vLine%%${vLine##?}}" != '#' ]; then

I modified it to:
Code:
#!/usr/bin/ksh

echo "###################################################"

v_res="start"
echo "v_res_begin="$v_res

while IFS= read vLine
do

  set -- $vLine
 
  if [ "$1" != "#FlatFiles" ]; then
    continue
  fi

  v_res="error"

  # there is some code ... if error then break

  echo "v_res_loop1="$v_res
  v_res="ok"
  echo "v_res_loop2="$v_res

done < a.log

echo "v_res_after_loop="$v_res

Last edited by Franklin52; 02-25-2011 at 05:55 AM.. Reason: Please use code tags, thank you
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