Why for loop is acting weird - Shell Programming and Scripting

dsravan · #1 09-13-2006

Hey i have a small script in which i check if a file with that pattern exists or not. If present then i go ahead with further processing.

In the present situation i have only one file with that name and for loop is reading twice. Here is the script. And the output of debug mode. Please help.

Quote:

myfilepattern=$1_$2
fullpattern=${myfilepattern}_$NEW_DT.dat
integer filecount=0
for file in $fullpattern ; do
[ "$file" != "$fullpattern" ] && filecount=$filecount+1
done

if (( $filecount == 1 )); then

I pass 2 parameters to the script.

and the debug output shows it;s reading 2 times in the for loop.

Quote:

files=AUD01_CARE_DLY_20060912 .dat
+ myfilepattern=AUD01_CARE_DLY
+ fullpattern=AUD01_CARE_DLY_20060912 .dat
+ typeset -i filecount=0
+ [ AUD01_CARE_DLY_20060912 != AUD01_CARE_DLY_20060912 .dat ]
+ filecount=0+1
+ [ .dat != AUD01_CARE_DLY_20060912 .dat ]
+ filecount=1+1
+ (( 2 == 1 ))

vino · #2 09-13-2006

Notice the whitespace in
fullpattern=AUD01_CARE_DLY_20060912 .dat

You need to get rid of that space or alternatively use

Code:

for file in "$fullpattern" ; do
[ "$file" != "$fullpattern" ] && filecount=$filecount+1
done

anbu23 · #3 09-13-2006

AUD01_CARE_DLY_20060912[SPACE].dat
So in for loop it will take as two arguments. If you want to treat as single argument then do this

Code:

for file in "$fullpattern" ; do

dsravan · #4 09-13-2006

Thanks friends,

I got it working but i don't understand how the spaces are coming as my code doesn't have any spaces in it.

Quote:

myfilepattern=$1_$2
fullpattern=${myfilepattern}_$NEW_DT.dat
integer filecount=0
for file in $fullpattern ; do
[ "$file" != "$fullpattern" ] && filecount=$filecount+1
done

if (( $filecount == 1 )); then

Please observer that there is no space in fullpattern variable here. Please suggest

anbu23 · #5 09-13-2006

check this variable NEW_DT contains any space. if you have still problem show us how did you get the value for that variable

dsravan · #6 09-13-2006

Thanks Anbu, the NEW_DT is having space in it. It solved the problem.

Thanks,

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