What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

Universal configuration monitoring and system of record for IT.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:



May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Top Tags





Check if system is 32bit or 64bit

Terminal - Check if system is 32bit or 64bit
getconf LONG_BIT
2012-12-12 23:51:51
User: varghjarta
Functions: getconf
Check if system is 32bit or 64bit

Needed a quick way to see if my server distro that I setup years ago was running 32bit or not, since with time I had forgotten.

Note: does not check _hardware_ e.g. /proc/cpuinfo but rather the kernel installed


There are 2 alternatives - vote for the best!

Terminal - Alternatives
getconf LONG_BIT
2009-08-08 21:22:19
User: caiosba
Functions: getconf
Tags: getconf 32 64

Easy and direct way to find this out.

sudo lshw -C cpu|grep width
grep -q '\<lm\>' /proc/cpuinfo && echo 64 bits || echo 32 bits
2013-02-09 13:01:36
User: sputnick
Functions: echo grep

This command tell you if your hardware is 32 or 64 bits even if you install a 32bits OS on a 64 bits hardware.

If your distro don't support the -q switch, try doing :

grep &>/dev/null '\<lm\>' /proc/cpuinfo && echo 64 bits || echo 32 bits
isainfo -v
2013-01-04 03:07:28
User: halcyonblue

This is likely only valid on Solaris based systems. Unfortunately a lot of the more universal techniques for determining if a system is 32bit or 64bit on x86 solaris fail to give much more information than "i86pc"

Know a better way?

If you can do better, submit your command here.

What others think

It's a nice way to detect the HARDWARE word size, but for the kernel, the uname -m is the best option

Comment by bkmeneguello 154 weeks and 3 days ago


Comment by MarxBro 154 weeks ago

@bkmeneguello: Good catch, I stand better informed thanks!

@MarxBro: I have no idea, I searched for it to no avail and didnt bother looking a lot, this is mostly for personal use anyway, sorry if it causes confusion!

Comment by varghjarta 154 weeks ago

Your point of view

You must be signed in to comment.