Shell Programming and Scripting

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123456
1890

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abc.txt matches with bcd.txt
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12345
abc.txt not matches with bcd.txt
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bcd.txt not matches with abc.txt
199

awk -F"," 'BEGIN{OFS=","}
{
if(NR==FNR){
a[FNR]=$0;max=FNR;Next}
if(NR!=FNR)
 {
if (FNR==1) print $0;
 for ( i=1;i<=max;i++)
 {  
 tmp = a[i];
 len = length(tmp);
 if(substr($1,1,len) ==tmp)
 {print $0;}
 } #End For
 } #End if
}' abc.txt bcd.txt > abc_matches_bcd.txt;

awk 'BEGIN{print "abc.txt matches with bcd.txt"} FNR==NR{X[$1]=$1;next} {Y[$1]=$1} {for(i in X){for(i in Y){if(X[i]){print X[i];delete X[i];delete Y[i]}}}} END{print "abc.txt not matches with bcd.txt"; for(u in X){if(X[u]){print X[u]}};print "bcd.txt not matches with abc.txt"; for(v in Y){print Y[v]}}' abc.txt bcd.txt

abc.txt matches with bcd.txt
120
122
123
abc.txt not matches with bcd.txt
1890
1234
123456
1245
191
bcd.txt not matches with abc.txt
1201
1203
12345
121
1224
199

awk 'BEGIN{print "abc.txt matches with bcd.txt"}
     FNR==NR{X[$1]=$1;next}
     {Y[$1]=$1}
     {for(i in X)
        {for(i in Y)
                {if(X[i])
                        {print X[i];
                         delete X[i];
                         delete Y[i]
                        }
                }
        }
     }
     END{
        print "abc.txt not matches with bcd.txt";
        for(u in X){
                        if(X[u])
                                {print X[u]}
                   };
        print "bcd.txt not matches with abc.txt";
        for(v in Y){
                        print Y[v]
                   }
        }' abc.txt bcd.txt

awk 'NR==FNR{a[$1]++;next}
{if(a[$1]){m[$1]++}else{notM[$1]++}delete a[$1]} 
END {print "matching"; for (i in m) {print i}
print "abc not match with bcd"; for ( j in a) {print j;}
print "bcd not match with abc"; for (k in notM) { print k}}' abc.txt bcd.txt