grep -A 1 -i "Search-for-something" /var/lib/jbossas/server/halprdjbs01/log/server.log
6.1 Display N lines after match
-A is the option which prints the specified N lines after the match as shown below.
Syntax:
grep -A <N> "string" FILENAME
The following example prints the matched line, along with the 3 lines after it.
$ grep -A 3 -i "example" demo_text
6.2 Display N lines before match
-B is the option which prints the specified N lines before the match.
Syntax:
grep -B <N> "string" FILENAME
When you had option to show the N lines after match, you have the -B option for the opposite.
$ grep -B 2 "single WORD" demo_text
6.3 Display N lines around match
-C is the option which prints the specified N lines before the match. In some occasion you might want the match to be appeared with the lines from both the side. This options shows N lines in both the side(before & after) of match.
$ grep -C 2 "Example" demo_text