Collecting and Filtering Information Using IOS show Commands

Using pipes with include, exclude and begin

R1# show processes cpu | include IP Input

71     3149172   7922812        397  0.24%  0.15%  0.05%   0 IP Input

 

S1# show ip interface brief | exclude unassigned

Interface              IP-Address      OK? Method Status           Protocol

Vlan128                10.1.156.1      YES NVRAM  up               up

 

S1# show running-config | begin line vty

line vty 0 4

transport input telnet ssh

line vty 5 15

transport input telnet ssh

!

End

R1# show processes cpu| include IP Input

^

% Invalid input detected at ‘^’ marker.

 

Using pipes with section and ^

 

R1# show running-config | section router eigrp

router eigrp 1

network 10.1.192.2 0.0.0.0

network 10.1.192.10 0.0.0.0

network 10.1.193.1 0.0.0.0

no auto-summary

 

R1# show processes cpu | include ^CPU|IP Input

CPU utilization for five seconds: 1%/0%; one minute: 1%; five minutes: 1%

71   3149424   7923898     397  0.24%  0.04%  0.00%   0 IP Input

 

Using the redirect and tee options

R1# show tech-support | redirect tftp://192.168.37.2/show-tech.txt

R1# show ip interface brief | tee flash:show-int-brief.txt

Interface                  IP-Address      OK? Method Status                Protocol

FastEthernet0/0            10.1.192.2      YES manual up                    up

FastEthernet0/1            10.1.192.10     YES manual up                    up

Loopback0                  10.1.220.1      YES manual up                    up

 

R1# dir flash:

Directory of flash:/

1 -rw-  23361156  Mar 2 2009 16:25:54 -08:00 c1841-advipservicesk9mz.1243.bin

2 -rw-       680  Mar 7 2010 02:16:56 -08:00 show-int-brief.txt

 

Using the append option and the more command

R1# show version | append flash:show-commands.txt

R1# show ip interface brief | append flash:show-commands.txt

R1# more flash:show-commands.txt

Cisco IOS Software, 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(23), RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2008 by Cisco Systems, Inc.

Compiled Sat 08-Nov-08 20:07 by prod_rel_team

ROM: System Bootstrap, Version 12.3(8r)T9, RELEASE SOFTWARE (fc1)

R1 uptime is 3 days, 1 hour, 22 minutes

< output omitted >

Interface                  IP-Address      OK? Method Status                Protocol

FastEthernet0/0            10.1.192.2      YES manual up                    up

FastEthernet0/1            10.1.192.10     YES manual up                    up

• The append option is similar to the redirect option, but it allows you to append the output to a file instead of replacing that file.
• The use of this command option makes it easy to collect the output of several show commands in a text file.
• A prerequisite for this option is that the file system that you are writing to must support “append” operations, so for instance, a TFTP server cannot be used in this case.
• In this example, the content of the file is displayed using the more command.

• A more generic way of filtering is to use the a pipe operator “|” with Cisco IOS show commands, followed by one of the keywords include, exclude, or begin, and then a regular expression. Regular expressions are patterns that can be used to match strings in a piece of text. The pattern to be matched is case sensitive.
• The first example shows only the IP Input CPU process for R1.
• The second example shows only switch S1 interfaces that have an IP addressed assigned.
• The third example shows the running config for switch S1 beginning with the first output line that contains the character string “line vty”.
• The fourth example illustrates that, when using the pipe operator, there must always be at least one space preceding and following it, otherwise it will not be accepted by the IOS CLI.

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