Linux Search Pattern Question: Download Search Pattern PDF

What will be printed for the command below?
$ grep -c "^echo" abc
a) The count of lines that do not contain the pattern echo in file abc
b) The count of lines which begin with the pattern echo in file abc
c) The count of lines that ends with the pattern echo in file abc
d) None of the above

b) The count of lines which begin with the pattern echo in file abc

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Which option of grep displays the line number as well? a) -v b) -l c) -n d) -E	What is the output of this program? #include<stdio.h> #include<fcntl.h> int main() { int fd, fd2, ret; fd = open("san.c",O_RDONLY); ret = close(fd2); printf("%dn",ret); } a) 0 b) 1 c) -1 d) none of the mentioned