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You cannot strcat a character. You strcat entire strings. That will cause a segmentation fault.

So use fgets instead of fgetc there.

Also: What code gets run here depends on the content of...

Did you try solution that I provided in your previous thread (https://www.unix.com/shell-programming-scripting/157884-need-help-sed-perl.html)?
I just changed "a" to "\t":perl -F'"' -anle 'for...

$ cat buf
Vivek 50
Ram 34
Hulk 45
Vivek 23
Ram 23
Vivek 55
$ perl -anle '$x{$F[0]}+=$F[1]; END { foreach (keys %x) { print "$_ $x{$_}" } }' buf
Ram 57
Hulk 45
Vivek 128

Hi
First time, when the file is processed, it takes the count of 1st column duplicates. Second time, when it is processed, it starts printing those lines which has count more than 1.

btw,...