cgrep - grep and display context
cgrep [-a n] [-b n] [-f] [-l n] [-n] [-w n] pattern [file] ...
-a How many lines to display after the matching line
-b How many lines to display before the matching line
-f Suppress file name in the output
-l Lines are truncated to this length before comparison
-n Suppress line numbers in the output
-w Sets window size (same as -a n -b n)
cgrep -w 3 hello file1
# Print 3 lines of context each way
Cgrep is a program like grep, except that it also can print a few lines
above and/or below the matching lines. It also prints the line numbers
of the output.