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.

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

2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.
Hide

Tags

Hide

Functions

Convert embedded spaces in filenames to "_" (underscore)

Terminal - Convert embedded spaces in filenames to "_" (underscore)
ls -1 | grep " " | awk '{printf("mv \"%s\" ",$0); gsub(/ /,"_",$0); printf("%s\n",$0)}' | sh # rename filenames: spaces to "_"
2009-03-15 18:42:43
User: mpb
Functions: awk grep ls rename sh
2
Convert embedded spaces in filenames to "_" (underscore)

This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character.

Alternatives

There are 6 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

this also does the trick:

ls|while read f;do mv "$f" "${f// /_}";done
Comment by elzapp 292 weeks and 4 days ago

Or...

for i in *\ *; do mv "$i" $(echo -n "$i" | sed 's/ /_/g'); done

Nice variable substition, elzapp!

Comment by flatcap 292 weeks and 4 days ago

Try this:

rename 'y/ /_/' *
Comment by goodevilgenius 292 weeks and 4 days ago

@goodevilgenius Who'd've thunk it

Comment by elzapp 292 weeks and 4 days ago

goodevilgenuius' good suggestion invokes the prename perl script provided by the 'perl' package, at least under Ubuntu/Debian. On my ubuntu system, the rename command is symlinked to prename, and the original, non-perl rename command, which is still useful, is known as rename.ul

See $man prename, $less `which prename` and $man rename.ul for more. :-)

Comment by bwoodacre 292 weeks and 4 days ago

Thanks for the comments. It's a great way to learn fu.

# before ls -1

big world keeps turning

bye bye

fred

hello world

ls|while read f;do mv "$f" "${f// /_}";done

mv: `fred' and `fred' are the same file

# after ls -1

big_world_keeps_turning

bye_bye

fred

hello_world

I think we need a ' | grep " " ' in there.

Comment by mpb 292 weeks and 4 days ago

@mbp no need for a grep, just replace the "ls" with ls "* *"

ls "* *"|while read f;do mv "$f" "${f// /_}";done
Comment by elzapp 292 weeks and 4 days ago

d'oh mpb even...

Comment by elzapp 292 weeks and 4 days ago

@elzapp I admire your intention (to reduce the command line length) but it does not work for me:

ls -1

big world keeps turning

bye bye

felicity

hello

two spaces embedded

ls "* *"

ls: cannot access * *: No such file or directory

This works (for me):

ls | grep " " | while read f;do mv "$f" "${f// /_}";done # after ls -1

big_world_keeps_turning

bye_bye

felicity

hello

two__spaces__embedded

Comment by mpb 292 weeks and 4 days ago

flatcap's version seems the most straightforward to me, and it's the only one that works on my system (Cygwin)

Comment by Ben 292 weeks and 4 days ago

/me takes hat off for "detox". Not only does it sort out spaces, it removes other ugly characters and is recursive.

Very nifty!

http://www.commandlinefu.com/commands/view/1498/iso-8859-1-to-utf-8-safe-recursive-rename

Comment by mpb 292 weeks and 3 days ago
ls|awk '/ /{c=$1; for (i=2;i<=NF;i++) c=c "_" $i; system("mv \"" $0 "\" \"" c "\"")}'
Comment by point_to_null 291 weeks and 6 days ago

@point_to_null switched to "detox" already

http://www.commandlinefu.com/commands/view/1498/iso-8859-1-to-utf-8-safe-recursive-rename

Comment by mpb 291 weeks and 3 days ago

Your point of view

You must be signed in to comment.

Related sites and podcasts