Commands by twjolson (5)

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hard disk information - Model/serial no.
Get the hard disk information with out shutting down and opening the system. It gives information on model no., serial no., cylinders/heads/sectors, and the supported features of the hard disk.

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"

Delete all empty/blank lines from text file & output to file

Get your public ip

Get the size of all the directories in current directory (Sorted Human Readable)
as per eightmillion's comment. Simply economical :)

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

check open ports without netstat or lsof

Install pip with Proxy
Installs pip packages defining a proxy

clone directory structure
dir1 and all its subdirs and subdirs of subdirs ... but *no files* will be copied to dir2 (not even symbolic links of files will be made). To preserve ownerships & permissions: $ cp -Rps dir1 dir2 Yes, you can do it with $ rsync -a --include '*/' --exclude '*' /path/to/source /path/to/dest too, but I didn't test if this can handle attributes correctly (experiment rsync command yourself with --dry-run switch to avoid harming your file system) You must be in the parent directory of dir1 while executing this command (place dir2 where you will), else soft links of files in dir2 will be made. I couldn't find how to avoid this "limitation" (yet). Playing with recursive unlink command loop maybe? PS. Bash will complain, but the job will be done.

check the filesystem and use a progress bar
if you happen to start with out the -C switch then you a killall -USR1 e2fsck

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