Commands using tar (226)

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show lines that appear in both file1 and file2

Exclude a string with awk

Rename .JPG to .jpg recursively
This command is useful for renaming a clipart, pic gallery or your photo collection. It will only change the big caps to small ones (on the extension).

Get a docker container's run command line
A good way to build a new container when you don't remember how you did it the first time

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"

Recover tmp flash videos (deleted immediately by the browser plugin)
Newer versions of the flashplayer browser plugin delete the tmp flash video immediately after opening a filehandle to prevent the user from "exporting" the video by simply copying the /tmp/FlashXYZ file. This command searches such deleted flash videos and creates symbolic links to the opened filehandle with the same name as the deleted file. This allows you to play your flash-videos (from e.g. youtube) with e.g. mplayer or copy the buffered video if you want to keep it.

What is My WAN IP?
The curl command retrieve the HTML text containing the IP address. The grep command picks out the IP address from that HTML text.

Startup a VPN connection through command line

Extract a bash function
I often need to extract a function from a bash script and this command will do it.

Quickly add user accounts to the system and force a password change on first login
This command is a bit Linux specific, as --stdin doesn't exist for passwd on many Unix machines. Further, useradd is high level in most distributions and Unix derivatives except for the Debian family of distros, where adduser would be more appropriate. The last bit, with chage, will force the user to change their password on new login.

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