Linux in a Nutshell, Fifth Edition

iptables | 217

Linux

Commands

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-q Report on message queues.

-s Report on semaphore arrays.

Output format options:

-b Print information on maximum size of the resource: size in

bytes of messages or shared memory segments, and the

number of semaphores per set in the case of semaphore arrays.

-c Print creator and owner user IDs for IPC facilities.

-l Print resource maximum and minimum limits.

-o Print outstanding usage of the resource in question: the

number of messages and the total size of the message queue,

or the number of processes using shared memory segments.

-p Print creator and last operation process identifiers.

-t Print attach, detach, and change times for shared memory

segments, last operation and change times for semaphore

arrays, and send, receive, and change times for message

queues.

-u Print summary of current resource usage.

Other options:

-h Print help message, then exit.

-i identifier

Used in combination with the -m, -q,or-s options. Report

only on the resource specified by numeric identifier.

iptables

iptables command [options]

System administration command. Configure netfilter filtering rules

for kernels 2.4 and later. Rules for iptables consist of some

matching criteria and a target, a result to be applied if the packet

matches the criteria. The rules are organized into chains.