Commands by phattmatt (3)

  • If you are an unlucky soul behind a corporate firewall you will likely find that downloading gpg keys is blocked. This is because the hkp protocol uses port 11371 by default to transfer the key. By adding "hkp://" to the beginning of the hostname and ":80" to the end you are asking gpg to try using port 80 to connect (less likely to be blocked by a firewall). This relies on the remote server answering to requests over port 80. Show Sample Output


    0
    sudo apt-key adv --keyserver hkp://keys.gnupg.net:80 --recv-keys [key to get here]
    phattmatt · 2013-07-23 08:29:40 8
  • Requires software found at: http://lpccomp.bc.ca/remserial/ Remote [A] (with physical serial port connected to device) ./remserial -d -p 23000 -s "115200 raw" /dev/ttyS0 & Local [B] (running the program that needs to connect to serial device) Create a SSH tunnel to the remote server: ssh -N -L 23000:localhost:23000 user@hostwithphysicalserialport Use the locally tunnelled port to connect the local virtual serial port to the remote real physical port: ./remserial -d -r localhost -p 23000 -l /dev/remser1 /dev/ptmx & Example: Running minicom on machine B using serial /dev/remser1 will actually connect you to whatever device is plugged into machine A's serial port /dev/ttyS0.


    1
    remserial -d -p 23000 -s "115200 raw" /dev/ttyS0 &
    phattmatt · 2012-11-19 17:56:02 6
  • Runs the identify command (from ImageMagick) on each jpg file in the current directory and returns image details according to the format parameter. The example here returns: Filename FileSize Compression Width Height More information about the available format options can be found here: http://www.imagemagick.org/script/escape.php I usually redirect the output to a text file using "> listofdetails.txt" at the end. Spreadsheet magic can then be applied. Show Sample Output


    0
    for file in *.jpg; do identify -format '%f %b %Q %w %h' $file; done
    phattmatt · 2012-11-16 10:06:35 7

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

check open ports without netstat or lsof

Random quote from Borat
I improved a bit on the original by only using sed and extracting the quote with a matching group. Use -nE for sed on Mac OSX Use -nr for sed on Linux. Warning! The quotes from Borat are definitely offensive.

Display IPs accessing your Apache webserver.

Set RGB gamma of secondary monitor
This command first determines whether a second screen is connected. If this is the case, it sets the screen's RGB gamma via xrandr. Useful for cheap or slightly defective monitors with a tint. In this example a yellowing/champagne color deviation is compensated for by decreasing the red and the green portion of the image.

duration of the DNS-query

rename anime fansubs
renames Anime Episodes to files, that can be parsed by sonarr & co

Router discovery

purge all packages marked with 'rc'
After you install/remove lots of packages, there are many packages marked with 'rc'. This script help you to purge these packages, it will save some spaces from your disk.

Rename files in batch

prettier "cal" command
Displays the same output as "cal", but with the current day highlighted (probably dependent on gnu grep, as I'm not sure other grep's support the "--color=auto" option). Tested and working on Ubuntu 11 and OSX Lion.


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: