Grep for Cisco commands

To view a IOS line parser

Show parser dump

Its an excellent command to see the selected functionality of the command. we can use it just like a Grep in Unix.

 For example:

R1#sh parser dump interface | include queue
15 tx-queue-limit Number
15 dialer hold-queue <0-100> timeout <1-2147483>
15 dialer hold-queue <0-100>
15 dialer hold-queue
15 funi rate-queue Number Number
15 funi rate-queue tolerance svc pvc 0 strict
15 funi rate-queue tolerance svc pvc 0
15 funi rate-queue tolerance svc pvc <5-99> strict
15 funi rate-queue tolerance svc pvc <5-99>
15 funi rate-queue tolerance svc 0 strict
15 funi rate-queue tolerance svc 0
15 funi rate-queue tolerance svc <5-99> strict
15 funi rate-queue tolerance svc <5-99>
15 funi rate-queue Number Number
15 funi rate-queue tolerance svc pvc 0 strict
15 funi rate-queue tolerance svc pvc 0
15 funi rate-queue tolerance svc pvc <5-99> strict
15 funi rate-queue tolerance svc pvc <5-99>
15 funi rate-queue tolerance svc 0 strict
15 funi rate-queue tolerance svc 0
15 funi rate-queue tolerance svc <5-99> strict
15 funi rate-queue tolerance svc <5-99>
15 funi rate-queue Number Number

or more extensively

Willow#show parser dump interface extend  | in queue.*(Enable|Configure)
tx-queue-limit : Configure card level transmit queue limit
srr-queue : Configure shaped round-robin transmit queues
srr-queue : Configure shaped round-robin transmit queues
srr-queue : Configure shaped round-robin transmit queues
fair-queue : Enable Fair Queuing on an Interface
fair-queue : Enable Fair Queuing on an Interface
fair-queue : Enable Fair Queuing on an Interface
fair-queue : Enable Fair Queuing on an Interface
fair-queue : Enable Fair Queuing on an Interface
tx-queue-limit : Configure card level transmit queue limit
srr-queue : Configure shaped round-robin transmit queues
srr-queue : Configure shaped round-robin transmit queues
srr-queue : Configure shaped round-robin transmit queues
fair-queue : Enable Fair Queuing on an Interface
fair-queue : Enable Fair Queuing on an Interface
fair-queue : Enable Fair Queuing on an Interface
fair-queue : Enable Fair Queuing on an Interface
fair-queue : Enable Fair Queuing on an Interface 

it can be pretty handy, if used intelligently.