Install Grep by running the following commands:
root:grep-2.4.2# ./configure --prefix=/usr
root:grep-2.4.2# make
root:grep-2.4.2# make install
The grep package contains the egrep, fgrep and grep programs.
egrep prints lines from files matching an extended regular expression pattern.
fgrep prints lines from files matching a list of fixed strings, separated by newlines, any of which is to be matched.
grep prints lines from files matching a basic regular expression pattern.