Logical OR With Grep - Printable View

Logical OR With Grep

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Say you have a file that has seventeen entries that look like this:

[usr-1@srv-1 ~]$ cat nmapout.txt
Starting nmap 3.70 ( http://www.insecure.org/nmap/ ) at 2006-05-05 13:41 PDT
Interesting ports on 10.50.100.1:
(The 1656 ports scanned but not shown below are in state: closed)
PORT      STATE SERVICE
22/tcp    open  ssh
111/tcp   open  rpcbind
6000/tcp  open  X11
32771/tcp open  sometimes-rpc5
Device type: general purpose
Running: Linux 2.4.X|2.5.X|2.6.X
OS details: Linux 2.5.25 - 2.6.3 or Gentoo 1.2 Linux 2.4.19 rc1-rc7)
Uptime 2.789 days (since Tue May  2 18:48:20 2006)
.
.
.
Interesting ports on 10.50.100.79:
(The 1657 ports scanned but not shown below are in state: closed)
PORT     STATE SERVICE
22/tcp   open  ssh
111/tcp  open  rpcbind
1024/tcp open  kdm
MAC Address: 00:60:97:97:CC:04 (3com)
Device type: general purpose
Running: Linux 2.4.X|2.5.X
OS details: Linux 2.4.0 - 2.5.20
Uptime 0.159 days (since Fri May  5 10:12:22 2006)
Nmap run completed -- 80 IP addresses (17 hosts up) scanned in 1178.103 seconds

See this article for a background on what is happening here. A quick way to generate a list of IP addresses and kernel versions is to do a grep that uses a logical OR. What we need to do is look for "Interesting" OR "Running". Grep seems like the obvious choice, however the catch is you need to use extended regular expressions. There are two ways to do this:

[usr-1@srv-1 ~]$ grep -E "Running|Interesting" nmapout.txt
[usr-1@srv-1 ~]$ egrep "Running|Interesting" nmapout.txt

Both reflect the file:

Interesting ports on 10.50.100.1:
Running: Linux 2.4.X|2.5.X|2.6.X
.
.
.
Interesting ports on 10.50.100.79:
Running: Linux 2.4.X|2.5.X
[usr-1@srv-1 ~]$

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