commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
The "proportional set size" is probably the closest representation of how much active memory a process is using in the Linux virtual memory stack. This number should also closely represent the %mem found in ps(1), htop(1), and other utilities.
Same as the rest, but handle IPv6 short IPs. Also, sort in the order that you're probably looking for.
This gets the Nth argument in the last line of your history file. This is useful where history is being written after each command, and you want to use arguments from the previous command in the current command, such as when doing copies/moving directories etc.
I wrote this after getting irritated with having to continually type in long paths/arguments.
You could also use $_ if all you want is the last argument.
To sort the list by file/directory size, insert `sort -n |` before `awk`.
This command give you Just the Network Cidr Notation
This will find all the -Xmx[BIGINT] running on a system, add them up for you and give you the total.
Solves these pesky errors you see in the Apache log:
[Fri Jun 28 17:51:00 2013] [emerg] (28)No space left on device: Couldn't create accept lock (/monsoon/opt/apache2/logs/accept.lock.356) (5)
Naturally, can be used to get rid of other semaphores. Note: change the apache user in accordance to your ENV.
..not guaranteed to always be accurate but fun to see how old you Linux installation is based on the root partitions file system creation date.
List system current active ip address