grep -A -B | ggrep | grep -r

greo -A -B line after before

grep -- -1000 # grep negative value

----------------

bash-3.00# grep 15:[12][70] f[123].txt
f1.txt:root console Apr 10 15:17 (:0)
f1.txt:root pts/3 Apr 10 15:20 (:0.0)
f2.txt:root console Apr 10 15:17 (:0)
f2.txt:root pts/3 Apr 10 15:20 (:0.0)
f3.txt:root console Apr 10 15:17 (:0)
f3.txt:root pts/3 Apr 10 15:20 (:0.0)
----------
bash-3.00# grep -l 'text' f*
f.txt
f1.txt
f2.txt
f3.txt


-----------

 * e - go to the end of the current word.
 * E - go to the end of the current WORD.
 * b - go to the previous (before) word.
 * B - go to the previous (before) WORD.
 * w - go to the next word.
 * W - go to the next WORD.

grep -A <N> "string" FILENAME

The following example prints the matched line, along with the 3 lines after it.
================

$ export GREP_OPTIONS='--color=auto' GREP_COLOR='100;8'

$ grep this demo_file
this line is the 1st lower case line in this file.
Two lines above this line is empty.
And this is the last line.

For Solaris 
ggrep -A 10

For GNU, BDS
grep -A 10 -B 10


When you want to search in all the files under the current directory and its sub directory

$ grep -r "ramesh" *

Invert match using grep -v