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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)

Show available conversions
aliases on each line. i.e. txt2html: $recode ..HTML file.html txt to Base64: $recode ../b64 file.b64 and so on.

cycle through everything sox knows how to read, playing only the first three seconds
I wasted two hours reading the sox documentation and searching on the web for the format of some obscure fscking sound sample, and then finally came up with this. This plays only the first three seconds of your unknown formatted sound file using every one of sox's built-in filetypes. If you don't get an exact match, you may get close. . I could not fit every single type in and keep it under 127 characters, so you will have to replace "..." with the full list obtainable by `$ sox --help` (or try `Show sample output`) . note: /usr/bin/play should be linked to sox on most systems.

Print diagram of user/groups
Parses /etc/group to "dot" format and pases it to "display" (imagemagick) to show a usefull diagram of users and groups (don't show empty groups).

Remove annoying files from recently extracted zip archive
Inspired by http://www.commandlinefu.com/commands/view/2573/remove-all-files-previously-extracted-from-a-tar.gz-file. .... yet for zip files

Test a serial connection
If the connection works you should see a "hello" on host A. If not: check your cabeling etc :-)

Calculate days on which Friday the 13th occurs
Simply change the years listed in the first seq, and it will print out all the months in that span of years that have Friday the 13ths in them.

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

Start COMMAND, and kill it if still running after 5 seconds

check open ports without netstat or lsof


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