Hide

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.
Hide

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:

Hide

News

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!
Hide

Top Tags

Hide

Functions

Hide

Credits

Retrieve the size of a file on a server

Terminal - Retrieve the size of a file on a server
wget --spider $URL 2>&1 | awk '/Length/ {print $2}'
2011-07-03 00:14:58
User: d3Xt3r
Functions: awk wget
5
Retrieve the size of a file on a server

- Where $URL is the URL of the file.

- Replace the $2 by $3 at the end to get a human-readable size.

Credits to svanberg @ ArchLinux forums for original idea.

Edit: Replaced command with better version by FRUiT. (removed unnecessary grep)

Alternatives

There are 2 alternatives - vote for the best!

Terminal - Alternatives
curl -s "$URL" |wc -c
2011-07-18 15:47:57
User: Mozai
Functions: wc
Tags: size curl http
2

Downloads the entire file, but http servers don't always provide the optional 'Content-Length:' header, and ftp/gopher/dict/etc servers don't provide a filesize header at all.

Know a better way?

If you can do better, submit your command here.

What others think

Useless use of grep.......

Useless use of pipe........

wget --spider $URL 2>&1 | awk '/Length/ {print $2}'

Comment by FRUiT 213 weeks ago

Useful use of wget...

Comment by zlemini 212 weeks and 6 days ago

Useless use of 2>&1 ;)

Use |&

Comment by ioggstream 208 weeks and 5 days ago

@ioggstream: Doesn't work for me on bash v4.2.10

Comment by d3Xt3r 208 weeks ago

only works if $URL is an http or https protocol, and only if the server sends a Content-Length header.

Comment by Mozai 163 weeks and 1 day ago

Your point of view

You must be signed in to comment.