Commands by kudlaty01 (1)

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validate json
I have this saved as jsonlint chmodded +x and file.js is instead $1, but YMMV

list files recursively by size

use mplayer to watch Apple Movie Trailer instead of quicktime player
http://trailers.apple.com/trailers/ just copy the .mov link and use mplayer to stream

Who invoked me? / Get parent command
Get the name of the parent command. This might be helpful, if you need to react on that information. E. g. a script called directly via ssh has got sshd as parent, manually invoked the parent process will probably be bash

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 backdoor on a machine to allow remote connection to bash
This will launch a listener on the machine that will wait for a connection on port 1234. When you connect from a remote machine with something like : nc 192.168.0.1 1234 You will have console access to the machine through bash.

Use top to monitor only all processes with the same name fragment 'foo'
top accecpts a comma separated list of PIDs.

Run the last command as root
Same as `sudo !!`. If you do not have permission to be sudo or sudo does not installed on your system, you can use this.

add repeated watermark to image

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

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