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

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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.
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Psst. Open beta.

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:

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Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Commands by goodevilgenius from sorted by
Terminal - Commands by goodevilgenius - 13 results
printf "\U$(printf '%x' $((RANDOM%79+128512)) )"
2016-08-11 15:59:59
Functions: printf
Tags: bash emoji
3

This will print a random emoji within the range of 1F600 - 1F64F, which includes all the face emoji.

Obviously, this will only show something meaningful if your terminal can display emoji, but it may be useful in scripts.

This likely requires recent versions of bash

find -L -type l
2014-07-22 19:52:18
Functions: find
6

-L tells find to follow symbolic links, so -type l will only return links it can't follow (i.e., those that are broken).

curl -s http://www.census.gov/popclock/data/population/world | jshon -e world -e population -u
2013-07-28 00:52:00
Tags: curl jshon
1

Fetches the world population JSON data from the US census and parses it uses jshon

sudo youtube-dl -U
2010-10-02 12:51:46
Functions: sudo
3

If you update youtube-dl from the repos, it becomes out-of-date quickly. Luckily, it can auto-update.

man $(ls /bin | shuf | head -1)
2010-08-20 23:12:51
Functions: head ls man
Tags: man
1

I'm not sure why you would want to do this, but this seems a lot simpler (easier to understand) than the version someone submitted using awk.

echo $[RANDOM%X+1]
2010-08-07 02:43:46
Functions: echo
27

If X is 5, it will about a number between 1 and 5 inclusive.

This works in bash and zsh.

If you want between 0 and 4, remove the +1.

find . -type f -exec ls -tr {} +
2010-05-27 14:52:28
Functions: find ls
-2

List all files from the current directory and subdirectories, sorted by modification time, oldest first.

curl -sI http://slashdot.org/ | sed -nr 's/X-(Bender|Fry)(.*)/\1\2/p'
2009-07-31 19:55:17
Functions: sed
0

I'm pretty sure everyone has curl and sed, but not everyone has lynx.

find -name '*oldname*' -print0 | xargs -0 rename 's/oldname/newname/'
2009-07-27 00:44:06
Functions: find rename xargs
0

This is better than doing a "for `find ...`; do ...; done", if any of the returned filenames have a space in them, it gets mangled. This should be able to handle any files.

Of course, this only works if you have rename installed on your system, so it's not a very portable command.

find -L /path/to/check -type l -delete
2009-06-06 16:07:04
Functions: find
19

If you don't want to delete them, but just want to list them, do

find -L /path -type l

If you want to delete them with confirmation first, do

find -L /path -type l -exec rm -i {} +

Using the -L flag follows symlinks, so the -type l test only returns true if the link can't be followed, or is a symlink to another broken symlink.

tar -tf file.tar | tar -T - -uf file.tar
2009-05-22 00:28:13
Functions: tar
2

This will update the tarball, adding files that have changed since the last update.

This assumes that the tarball is in the same directory as the files being archived.

N.B. This command can't be used on compressed tarballs.

N.B. This will add the updated files to the tarball, so that the tarball will have two versions of each file. This will make the tarball larger, but doesn't have any other significant effect.

pi 66 | number
2009-05-03 22:10:58
0
pi 66

This prints out the first 66 digits of pi.

number

This takes any number (no more than 66 digits long) from stdin (or on the command line), and tells you how to say it. E.g

number 365

outputs "three hundred sixty-five"

xmms2 mlib search NOT +rating | grep -r '^[0-9]' | sed -r 's/^([0-9]+).*/\1/' | sort -R | head | xargs -L 1 xmms2 addid
2009-04-16 20:27:30
Functions: grep head sed sort xargs
3

If you're like me and want to keep all your music rated, and you use xmms2, you might like this command.

I takes 10 random songs from your xmms2 library that don't have any rating, and adds them to your current playlist. You can then rate them in another xmms2 client that supports rating (I like kuechenstation).

I'm pretty sure there's a better way to do the grep ... | sed ... part, probably with awk, but I don't know awk, so I'd welcome any suggestions.