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Find usb device in realtime
Using this command you can track a moment when usb device was attached.

ROT13 using the tr command

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"

Discover full java className for import;
If you want to code without a IDE, using java may be painful to discover correct full class names to import. This script google it with javadoc word, then with some luck we got the javadoc as first item. next it curl the target javadoc and extract full name from it. Can by customized to extract other javadoc infos. Pre-reqs: bash, google-chrome, html2text and core-utils

history autocompletion with arrow keys
This will enable the possibility to navigate in the history of the command you type with the arrow keys, example "na" and the arrow will give all command starting by na in the history.You can add these lines to your .bashrc (without &&) to use that in your default terminal.

create a new script, automatically populating the shebang line, editing the script, and making it executable.
The first argument is the interpreter for your script, the second argument is the name of the script to create.

send a circular
don't need echo :P

Do some learning...

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" }

Download SSL/TLS pem format cert from https web host


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