Shell Programming and Scripting

export string1=qwerWhatever
export string2=qwerWhatever1
export currdir=`pwd`

/dir/dir/Whatever1

echo $string1 | awk '{print substr($1,1,4) }'

lets just say the first four characters are =abcd
export string1=abcdWhatever
export string2=abcdWhatever1
export currdir=`pwd`
echo $currdir /dir/dir/Whatever1

if [[ `grep "abcd" string1` ]]
then 
   if [[ `grep "abcd" string2` ]]
   then
    cat string2 | grep -v "abcd" string2 > string3
   fi
fi

if [[ $curdir == string3 ]]
then 
echo "string 3 is equal to current directory"
fi

$ cat match.sh 
#!/usr/local/bin/bash
 
 
string1=qwerWhatever
string2=qwerWhatever1
currdir=/dir/dir/Whatever1
 
 
s1f4=$(echo $string1 | cut -c1-4)
if [[ "$string2" =~ $s1f4 ]]; then
  echo $s1f4 found in string2
  strng3=$(echo $string2 | sed "s/\(.*\)$s1f4\(.*\)/\1\2/")
  if [[ "$currdir" =~ "$string3" ]]; then
        echo Current dir has string3
  fi
else
  echo Intial match failed
fi
$ 
$ 
$ 
$ 
$ ./match.sh 
qwer found in string2
Current dir has string3
$

 =~

#!/usr/bin/ksh

string1=qwerWhatever
string2=qwerWhatever1
currdir=`pwd`

echo "string1 ==> $string1"
echo "string2 ==> $string2"
echo "currdir ==> $currdir"

string3=$(nawk -v VAR1=`echo $string1 | cut -c1-4` -v VAR2=$string2 'BEGIN {if (VAR2~VAR1) {gsub(VAR1,"",VAR2);print VAR2} else {print VAR1 " not found in string2"; system("exit")}exit;}' )
echo "string3 ==> $string3"

nawk -v VAR3=$string3 -v CURDIR=$currdir 'BEGIN {if (CURDIR ~ VAR3) print "currdir has" VAR3 ;else print "currdir does not have " VAR3 ; exit;}'

string1=qwerWhatever
s1f4=${string1:0:4}
echo $s1f4
qwer

string2=qwerWhatever1
string3=${string2//$s1f4/}
echo $string3
Whatever1