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Loop is not reading tabs from the file

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# 1  
Old 03-13-2012
Loop is not reading tabs from the file
Hi,

I am on HP-UX and K shell.

When I am using while/for loop for reading a file. It is working fine but not reading tabs:

Suppose, if the line is:
Code:
    ;  ;COMP;         ;        ;                                                                ;

then loop is reading as
Code:
; ;COMP; ; ; ; ;

Thanks for replying...
# 2  
Old 03-13-2012
1. Please post your script.
2. What is the exact requirement?
# 3  
Old 03-13-2012
I can post the code fragment:
Code:
      DIR_OK=${TARGET_PATH_OK##*/}
      if grep -Fq "${DIR_OK}" "${PREPAVAL_TRAVAIL}/${EDI_DIRS_list}" && [ -d "${TARGET_PATH_OK}" ]
      then
       FXML_index=`grep ${TARGET_PATH#*_} ${PREPAVAL_TRAVAIL}/${HX_header}`
       counter_src=1
       counter_dest=1
       DIR=${FXML_index%.EDI}
       while read FXML_line
       do
        if [ `echo $FXML_line | awk -F ";" '{print $61;}'` = "S" ] -o [ `echo $FXML_line | awk -F ";" '{print $61;}'` = "H" ]
        then
         if [ -d ${PREPAVAL_TRAVAIL}/${DIR} ]
         then    
          echo ${FXML_line} >> ${PREPAVAL_TRAVAIL}/${DIR}/${FXML_index}
          cp ${TARGET_ROOT_PATH}/${DIR_OK}/f`printf "%0.7d" $counter_src`.xml ${PREPAVAL_TRAVAIL}/${DIR}/f`printf "%0.7d" $counter_dest`.xml 2>/dev/null
 
          counter_dest=$(( $counter_dest+1 ))
 
         else
          mkdir ${PREPAVAL_TRAVAIL}/${DIR} 2>/dev/null
 
          echo ${FXML_line} > ${PREPAVAL_TRAVAIL}/${DIR}/${FXML_index}
          cp ${TARGET_ROOT_PATH}/${DIR_OK}/f`printf "%0.7d" $counter_src`.xml ${PREPAVAL_TRAVAIL}/${DIR}/f`printf "%0.7d" $counter_dest`.xml 2>/dev/null
                    counter_dest=$(( $counter_dest+1 ))
 
         fi
        fi
        counter_src=$(( $counter_src+1 ))
       done < "${PREPAVAL_TRAVAIL}/${FXML_index}"
       mv ${PREPAVAL_TRAVAIL}/${DIR} ${TARGET_EDI} 2>/dev/null
              mv ${PREPAVAL_TRAVAIL}/${FXML_index} ${TARGET_EDI} 2>/dev/null

and the exact requirement is the tabs should be read by the loop, it shouldn't be skipped.

Thanks for replying...
Last edited by ezee; 03-13-2012 at 04:03 AM..
# 4  
Old 03-13-2012
Two issues: To stop read from interpreting the line using read and losing beginning and ending tabs you can use:
Code:
while IFS= read -r FXML_line

to not lose those tabs during variable expansion use
Code:
echo "$FXML_line"

or better yet:
Code:
printf "%s\n" "$FXML_line"

This User Gave Thanks to Scrutinizer For This Post:
ezee
# 5  
Old 03-13-2012
Quote:
Originally Posted by Scrutinizer
Code:
while IFS= read -r FXML_line

Small explanation for this line please...
# 6  
Old 03-13-2012
IFS= means set the Input Field Selector to nothing for the read statement, causing no field splitting and keeping leading and ending tabs intact.
-r means do not interpret the \ character.
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