Commands by wildtype (1)

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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"

Watch active calls on an Asterisk PBX
This handles when you have a single call or channel. Other commands will strip out the result if there is a single channel or call active because the output changes the noun to be singular instead of plural.

Calculate md5 sums for every file in a directory tree

Buffer in order to avoir mistakes with redirections that empty your files
A common mistake in Bash is to write command-line where there's command a reading a file and whose result is redirected to that file. It can be easily avoided because of : 1) warnings "-bash: file.txt: cannot overwrite existing file" 2) options (often "-i") that let the command directly modify the file but I like to have that small function that does the trick by waiting for the first command to end before trying to write into the file. Lots of things could probably done in a better way, if you know one...

Get movie length

Count the number of pages of all PDFs in current directory and all subdirs, recursively

Ask user to confirm
Returns true if user presses the key. Use it like $ Confirm "Continue" && do action

Retry the previous command until it exits successfully
Executes the previously-run command constantly until it returns 0 (success). Put a

GREP a PDF file.
This is a good alternative to pdf2text for Ubuntu. To install it: sudo apt-get install python-pdfminer

Greets the user appropriately


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