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Quickly create an alias for changing into the current directory

python - covert image to base64 string for data URI use
useful if you are using lots of data URI's in your css files

Copy ssh keys to user@host to enable password-less ssh logins.
Alternative for machines without ssh-copy-id

The command used by applications in OS X to determine whether a plist is "good". from Ed Marczak.
The check an entire folder is a one-liner: plutil -lint * | grep -v OK$ from Ed Marczak

List all symbolic links in current directory
Tested with GNU and BSD ls.

Ping scanning without nmap
Usefull for when you don't have nmap and need to find a missing host. Pings all addresses from 10.1.1.1 to 10.1.1.254, modify for your subnet. Timeout set to 1 sec for speed, if running over a slow connection you should raise that to avoid missing replies. This will clean up the junk, leaving just the IP address: for i in {1..254}; do ping -c 1 -W 1 10.1.1.$i | grep 'from' | cut -d' ' -f 4 | tr -d ':'; done

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"

Watching Command
If you need to keep an eye on a command whose output is changing, use the watch command. For example, to keep an eye on your load average

escape any command aliases
e.g. if rm is aliased for 'rm -i', you can escape the alias by prepending a backslash: rm [file] # WILL prompt for confirmation per the alias \rm [file] # will NOT prompt for confirmation per the default behavior of the command

get a random 0/1, use it for on/off, yes/no
use it to add a random boolean switch to your script


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