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use wget to check if a remote file exists

list block devices
Shows all block devices in a tree with descruptions of what they are.

list files recursively by size

check open ports without netstat or lsof

pretend to be busy in office to enjoy a cup of coffee
using seq inside a subshell instead of a bash sequence to create increments.

resume other user's screen session via su, without pty error
Normally, if you su to another user from root and try to resume that other user's screen session, you will get an error like "Cannot open your terminal '/dev/pts/0' - please check." This is because the other user doesn't have permission for root's pty. You can get around this by running a "script" session as the new user, before trying to resume the screen session. Note you will have to execute each of the three commands separately, not all on the same line as shown here. Credit: I found this at http://www.hjackson.org/blog/archives/2008/11/29/cannot-open-your-terminal-dev-pts-please-check.

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"

Create a listing of all possible permissions and their octal representation.

Detect encoding of a text file
This command gives you the charset of a text file, which would be handy if you have no idea of the encoding.

download newest adminer and rename to it's version accordingly
If the version already downloaded. it will not download again


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