UNIX for Dummies Questions & Answers

OLDIFS="$IFS"
IFS=","

while IFS="$OLDIFS" read KEY DATA
do
        echo "Got line with key $KEY and data $DATA"
        for X in $DATA
        do
                grep "$X" datafile
        done
done < listfile

#! /bin/bash
wrd=`cat file.txt`
rr=( $(echo $wrd | sed 's/,/ /g' ) );
len=${#rr[*]};
for (( i=0;i<$len;i++ ))
do
temp=${rr[$i]};
grep $temp test.txt;
done

OLDIFS="$IFS"
# Split on spaces and commas
IFS=", "
while read LINE
do
        set -- $LINE # $1=INPUT $2=XX1 $3=XX2 ...

        shift # $1=XX1 $2=XX2 ...
        while [ "$#" -gt 0 ]
        do
                grep $1 test.txt # grep XX1 test.txt
                shift # $1=XX2 ...
        done
done < file.txt
IFS="$OLDIFS"

sed '
  s/.* //
  s/,/\
/g
 ' file.txt | sort -u >temp1
 
sed -n 's/^.* \([0-9][0-9]*\) *$/\1 &/p' test.txt | sort -u >temp2
 
join temp1 temp2 | sed 's/^[0-9][0-9]* //'