Command Line Magic

Don't do something for your predecesors, learn from them and do something for your decendants.

curl -N --limit-rate 16K http://f.climagic\.org/techsup.mp3 | mpg123 - # Stream mp3 at bitrate speed (128Kbits). WARNING: NSFW "lyrics"

Nullaphobia - The fear of what might be happening after you start to run a command and don't see output immediately. ie. rm -fr *

egrep -wo "(Donnie|Frank|Roberta|Grandma)" story.txt |sort|uniq -c|sort -r # Search for names and build a frequency count for each name.

df -lP |awk '{sum += $3} END {printf "%d GiB\n", sum/2**20}' # Show the total space used on all your local disk partitions.

for dir in */ ; do echo "${dir%/}" ; done # Use the */ trick to get only the directories, then use ${dir%/} to remove the trailing / you get

grep -P -o '(?<=href=")http:\S+(?=")' *.html # Use perl regex (negative look-behind/look-ahead assertions) to get URLs.

convert -size 1280x720 plasma:green-blue background.png # Create a 1280x720 color plasma image. Different each time. Uses ImageMagick

strings /dev/urandom | tr -c -d '0-9' | dd of=randomnumbers.txt bs=1 count=1M # Write 1MB (1048576) of random numbers to a file.

When confronted with new things, I first scoff at it. Then I scoff again. Then I try it. Then I use it. Then I defend it as a way of life.

sed "/bang/ s/foo/bar/" # Replace foo with bar only on lines that contain 'bang'. Use in pipeline or with file args. Thanks @Agarri_FR

Server: nc -l 8762 < video.mpg Client: nc server 8762 | mplayer -cache 1000 - # Poor man's video streaming service at video bitrate.

ssh -t user1@server1 'ssh -t user2@server2 "ssh -t user3@server3"' # After all the host keys and auth, you'll be on server3.

rig # rig is this cool little program that generates random identities.

http://store.climagic.com/  climagic t-shirts are available to show everyone you have shell skills.

play -n synth pl G2 pl B2 pl D3 pl G3 pl D4 pl G4 delay 0 .05 .1 .15 .2 .25 remix - fade 0 4 .1 norm -1 # Guitar strum. play is from sox pkg

sudo shutdown -h 60 & mpg123 ambientmusic/*.mp3 # Play music for 60 minutes and then shutdown. Like sleep on alarm clock.

less +F filename.log # Using +F option or pressing F in less is similar to `tail -f filename.log` but can use less's features. Thx @gazoombo