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I am doing some file IO with c code. I have a particular pattern in my file. I can verify this by a shell command cat abc.txt | grep abc | wc -l. When I execute the same command using System(), it give proper output, but I have no clue how can I get its output into a variable and compare it in my c code itself.
I tried looking into man pages which suggest using WEXITSTATUS(). This actually returns the status of execution and not output.
F1 !!
You don’t want
system(3)for that. Trypopen(3)and friends.