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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.

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Find if the command has an alias

SSH connection through host in the middle
Unreachable_host is unavailable from local network, but it's available from reachable_host's network. This command creates a connection to unreachable_host through "hidden" connection to reachable_host.

List only directories, one per line

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Find out which process uses an old lib and needs a restart after a system update
Shows the full output of lsof.

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"

Batch Convert SVG to PNG (in parallel)
Convert some SVG files into PNG using ImageMagick's convert command. Run the conversions in parallel to save time. This is safer than robinro's forkbomb approach :-) xargs runs four processes at a time -P4

Get just the IP for a hostname
has the benefit of being a bit more cross-platform.

Minimize Apps When Middle Clicking on Titlebar
Middle click on titlebar to minimize apps

Create black and white image
Use ImageMagick to create a "black and white" copy of an image.


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