Commands by vasti (1)

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Change every instance of OLD to NEW in file FILE
Very quick way to change a word in a file. I use it all the time to change variable names in my PHP scripts (sed -i 's/$oldvar/$newvar/g' index.php)

Clear current session history (bash)

Use nroff to view the man pages
Using nroff , it is possible to view the otherwise garbled man page with col command.

pretend to be busy in office to enjoy a cup of coffee
combination of several of the above

Fetch the current human population of Earth

Avoids ssh timeouts by sending a keep alive message to the server every 60 seconds
ssh_config is the system-wide configuration file for ssh. For per-user configuration, which allows for different settings for each host: $echo 'ServerAliveInterval 60' >> ~/.ssh/ssh_config On OSX: $echo 'ServerAliveInterval 60' >> ~/.ssh/config or $echo 'ServerAliveInterval 60' >> ~/etc/ssh_config

Find Duplicate Files (based on MD5 hash) -- For Mac OS X
This works on Mac OS X using the `md5` command instead of `md5sum`, which works similarly, but has a different output format. Note that this only prints the name of the duplicates, not the original file. This is handy because you can add `| xargs rm` to the end of the command to delete all the duplicates while leaving the original.

gzip compression with progress bar and remaining time displayed

Extracting a range of pages from a PDF, using GhostScript
In this example we extract pages 14-17

diff color words

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