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Control Not Coming Out Of While Loop

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# 1  
Old 10-06-2008
Control Not Coming Out Of While Loop
I have an empty .gz file in archival directory. And I am redirecting to a dat file. My while loop is not getting ended. I need the solution.

cnt=0
while read line
do
cnt=`expr $cnt + 1`
echo "$ARCH_DIR/$line.gz" >> $DATA_DIR/$FILE_LIST_FILE_FEB
FILE_NAMES=${FILE_NAMES}" "${line}
done
# 2  
Old 10-06-2008
Code:
while read line
do 
    # do thing here
done < inputfile

Plus you cannot read a gz file directly - it is compressed into 'garbage' characters and is not human readable. Use zcat.

If you are entering numbers from the keyboard, to get the loop to stop, use ctrl-D
# 3  
Old 10-06-2008
Quote:
Originally Posted by vinodh1978
I have an empty .gz file in archival directory.

Do you? You are not doing anything with it in the script below.
Quote:
And I am redirecting to a dat file. My while loop is not getting ended. I need the solution.

Where is the loop getting its input? It will finish whenever the end of the input is reached.

If input is coming from the keyboard, press ^D.
Quote:

Code:
cnt=0
  while read line
  do
    cnt=`expr $cnt + 1`


You do not need an external command for integer arithmetic in the standard Unix shell:
Code:
cnt=$(( $cnt + 1 ))

Quote:
Code:
    echo "$ARCH_DIR/$line.gz" >> $DATA_DIR/$FILE_LIST_FILE_FEB
    FILE_NAMES=${FILE_NAMES}" "${line}


The usual idiom is:
Code:
    FILE_NAMES="$FILE_NAMES $line"

Quote:
Code:
  done

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