Commands by vishnu81

Commands by vishnu81 (3)

sorted by

Encrypt your file using RC4 encryption

At times you will need to safeguard your files. Use OpenSSL's native rc4 encryption to do so. 'nopad' removes padding and 'nosalt' removes random salt being added to the file.
This is sample output - yours may be different.
0

hashkey=`echo -ne <your-secret> | xxd -p`; openssl rc4 -e -nosalt -nopad -K $hashkey -in myfile.txt -out myfile.enc.txt

vishnu81 · 2012-10-31 12:17:44 0
List all the unique extensions in a folder and print their count
This is sample output - yours may be different.
0

find . -type f -print | awk -F'.' '{print $NF}' | sort | uniq -c

vishnu81 · 2012-10-31 12:03:10 0
Remove lines ending or trailing slash (/)
This is sample output - yours may be different.
0

sed -i 'g/text/d' <filename>

vishnu81 · 2012-10-31 11:55:22 0

What's this?

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

Share Your Commands

Check These Out

grep -v with multiple patterns.

You can use -e to pass multiple patterns.

Search and play youtube videos directly to terminal (no X needed)

Same as other command, however uses youtube-dl internal search (thanks to qoxxxx mentioning this) It does however seem to be a little buggy and youtube-dl crashes sometimes. ## pyt 'Stairway to heaven - Led Zeppelin' pyt 'brain damage - Pink Floyd' No web browser or even X needed. Just a cli and internet connection! mplayer is pauseable and can skip ahead This may break if youtube changes their search html.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Start a command on only one CPU core

This is useful if you have a program which doesn't work well with multicore CPUs. With taskset you can set its CPU affinity to run on only one core.

Find how much of your life you've wasted coding in the current directory

Finds all C++, Python, SWIG files in your present directory (uses "*" rather than "." to exclude invisibles) and counts how many lines are in them. Returns only the last line (the total).

Virtualbox rsync copy (without defining any virtualbox configuration)

That is, after running `vagrant ssh-config` to determine ports and ip's: $ vagrant ssh-config Host default HostName 127.0.0.1 User vagrant Port 2200 UserKnownHostsFile /dev/null StrictHostKeyChecking no PasswordAuthentication no IdentityFile /Users/romanvg/tmp/.vagrant/machines/default/virtualbox/private_key IdentitiesOnly yes LogLevel FATAL

KDE Mixer Master Mute/Unmute

arguably better than using the driver interface. lots of potentially cool stuff to be done w/ the dcop client.

Bind a key with a command

the -x option is for binding to a shell command

list files recursively by size

Check reverse DNS

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:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands by vishnu81