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Top Forums Shell Programming and Scripting Reading a string and passing passing arguments to a while loop Post 302590202 by goddevil on Saturday 14th of January 2012 03:36:21 PM
Old 01-14-2012
Quote:
Originally Posted by agama
I cut/pasted the code in your post and it seems fine to me; I'm not getting an error. Can you past in your whole script, there is likely a typo somewhere in it.

An explanation:

The STOP and START shell variables allow you to define a line range from the input file. If not defined, the whole file is processed. If only START is defined, all lines before START are skipped. If STOP is defined, all lines after that line are skipped.

Code:
awk -F : -v last=${STOP:-0} -v first=${START:-0} '
    /^#/ { next; }   # if a line in the input starts with a hash, it is skipped
 
    # this section prints the first three fields and the whole line 
    # the $0 prints the whole line with the separators and is needed only to 
    # show that as $1 in the shell script echo
    NR >= first && (last == 0  || NR <= last) {
        print $1, $2, $3, $0
    }
' input-file

Thanks a mil for the explanation. It's gonna be pretty handy.
I use the same code that you've posted and get the EOF error. My frustrations not withstanding, i have gone ahead and written the results of the for loop into a tempfile and then proceeded to read the code from below(i have the working section commented out). I'd still like to understand why the below code throws up an error. I am only new to shell script and i'd like to understand whats going on so as not to repeat the errors. Thank you for your time
Code:
for i in $( cat param.txt | tail +$START | head -$STOP | grep -v "^#" | grep ':' )
                             do
                                   #echo $i
                                  # printf "%s\n" "$i" >> .param
                                   #printf "Press [enter] key to continue. . ."
                                   #read enterKey
                                   OLDIFS=$IFS
                                   IFS=":"
                                awk -F : -v last=${RESPONSESTOP:-0} -v first=${RESPONSE:-0} '
                                   /^#/ { next; }
                                   NR >= first && (last == 0  || NR <= last) {
                                    print $1, $2, $3, $0
                                    }
                                   ' param.txt | while read x y z i
                                   do
                                        echo "first field $x"
                                        echo "second field $y"
                                        echo "third field $z"
                                        echo "whole record (i) $i
                                   done
                                   #while read x y z
                                   #do
                                   #if [ "$z" == "GOD" ] ; then
                                   #       function1 $x $y
                                   #       function2 $y
                                   #       function3 $y
                                   #fi
                                   #if [ "$z" == "DEVIL" ] ; then
                                   #       function4
                                #   fi
                                #   done < .param
                                   IFS=$OLDIFS
                             done
                      #  echo "`cat .param`"
                        #rm -rf .param

 

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