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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"

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Monitor ElasticSearch cluster health - Useful for keeping an eye on ES when rebalancing takes place

Mount folder/filesystem through SSH
Install SSHFS from http://fuse.sourceforge.net/sshfs.html Will allow you to mount a folder security over a network.

Insert a line at the top of a text file without sed or awk or bash loops
Yet another way to add a line at the top a of text file with the help of the tac command (reverse cat).

Mac OS-X-> copy and paste things to and from the clipboard from the shell
Copies whatever is piped to the pbcopy command to the clipboard. pbpaste ... well pastes whats on the clipboard.

Quickly get summary of sizes for files and folders
Use this as a quick and simple alternative to the slightly verbose "du -s --max-depth=1"

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

display a smiling smiley if the command succeeded and a sad smiley if the command failed
you could save the code between if and fi to a shell script named smiley.sh with the first argument as and then do a smiley.sh to see if the command succeeded. a bit needless but who cares ;)

Open a file with specified application.
This command require mac os x.


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