Shell Programming and Scripting

$$FirstName=James
$$LastName=Fox
$$Dateofbirth=1980-02-04

$$FirstName=Ron
$$LastName=Fox
$$Dateofbirth=1960-01-31

#!/bin/sh

# Setting IFS="%" causes "${*}" to become "arg1%arg2%arg3%arg4".
OLDIFS="$IFS" ; IFS="%"

# arg1%arg2%arg3%arg4 gets split in awk later to A[1]=arg1, A[2]=arg2, A[3]=arg3, A[4]=arg4.
# Line 1 matches A[1] gets arg1, line 2 matches A[2] gets arg2, etc.
awk -F= -v OFS="=" -v S="${*}" 'BEGIN { split(S,A,"%") } ; NR in A { $2=A[NR] } 1' filename > newfilename

 cat test78.ksh
for j in $@
do
        let "i = i + 1"
        VAL1=`head -$i test78`
        VAL=`echo ${VAL1%%=*}`
        echo $VAL"="$j
done

./test78.ksh test singh 1960-01-31
$$FirstName=test
$$FirstName=singh
$$FirstName=1960-01-31

#!/bin/sh

NAMES='$$FirstName $$LastName $$Dateofbirth'

IFS="%"

awk -F= -v OFS="=" -v VS="${NAMES}" -v S="${*}" 'BEGIN { split(S,A,"%") ; split(VS,VY," ") ; for(X in VY) V[VY[X]]=A[X] } $1 in V { $2=V[$1] } 1' < inputfile > outputfile

 cat inputfile
#comment
$$notthis
$$FirstName=James
$$LastName=Fox
$$Dateofbirth=1980-02-04

 ./script1.sh "Ron%Donnely%1960-01-31"

 cat outputfile
#comment
$$notthis
$$FirstName=Ron
$$LastName=Donnely
$$Dateofbirth=1960-01-31