Commands by GilesGerhold (0)

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find an unused unprivileged TCP port
Some commands (such as netcat) have a port option but how can you know which ports are unused?

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"

Right-align text in console using pipe like ( command | right )

replace XX by YY in the the current directory and cd to it. ( in ZSH )
If you are in /begin/path/with/XX/pattern cd XX YY will change your current directory to /begin/path/with/YY/pattern in ZSH

Fibonacci numbers with awk
recursive version, "pure" AWK

temporarily override alias of any command
say, someone has aliased ls to 'ls --color=always' and you want to temporarily override the alias (it does not override functions)

Search through files, ignoring .svn

list processes with established tcp connections (without netstat)
Uses lsof to list open network connections (file descriptors), grepping for only those in an established state

Create a bash script from last commands
In order to write bash-scripts, I often do the task manually to see how it works. I type ### at the start of my session. The function fetches the commands from the last occurrence of '###', excluding the function call. You could prefix this with a here-document to have a proper script-header. Delete some lines, add a few variables and a loop, and you're ready to go. This function could probably be much shorter...

Remove ( color / special / escape / ANSI ) codes, from text, with sed
Remove ( color / special / escape / ANSI ) codes, from text, with sed Credit to the original folks who I've copied this command from. The diff here is: Theirs: [m|K] Theirs is supposed to remove \E[NUMBERS;NUMBERS[m OR K] This statement is incorrect in 2 ways. 1. The letters m and K are two of more than 20+ possible letters that can end these sequences. 2. Inside []'s , OR is already assumed, so they are also looking for sequences ending with | which is not correct. This : [a-zA-Z] This resolves the "OR" issue noted above, and takes care of all sequences, as they all end with a lower or upper cased letter. This ensures 100% of any escape code 'mess' is removed.


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