Commands by unixmonkey28771 (2)

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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"

Grab IP address on machine with multiple interfaces
Instead of hard-coding in a check to scrape info from ifconfig based on a specific interface, do it in a more portable way. This works really well if you switch between wired, wireless, bluetooth or even VPN connections. You can get your current IP in a script (since it'll be something like tun0 instead of eth0 or wlan1). This uses a well known public ip address 8.8.8.8, but it doesn't actually connect to it, it just shows you the route it would take.

Recursive find and replace file extension / suffix (mass rename files)
Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

Graphically show percent of mount space used
Automatically drops mount points that have non-numeric sizes (e.g. /proc). Tested in bash on Linux and AIX.

Size (in bytes) of all RPM packages installed
This command will output the size of all RPM packages and string them together into one enormous addition command which will be calculated by the echo $(( ))

Replace spaces in filename
This command will replace spaces in filename with underscore, for all file in directory that contain spaces.

mirrors directory to a ftp server
http://lftp.yar.ru/

Visualizing system performance data

Find the package that installed a command

Prints per-line contribution per author for a GIT repository
Uses line-porcelain in git blame, which makes it easier to parse the output.


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