Here is a small memo for some advanced commands or one-liners that I found useful.
Check a port on a host every 5 seconds
while :; do echo -n `date +"[%Y-%m-%d %H:%M:%S]"`; echo -n " "; nc -z 192.168.1.1 3389; if [ $? -eq 0 ]; then echo OK; else echo Unreachable; fi; sleep 5; done;When you just added yourself a group, and do not want to reboot immediately:
- To use
webdevgroup id (and privileges) in your current shell use:
newgrp webdev- To start a command with some group id (and keep current privileges in your shell) use:
sg webdev -c "command"Add this line to your .profile to take quick notes with date in the filename:
alias vimn='f(){ vim `date +%Y%m%y-%H%M`_$1.txt; unset -f f; }; f'Add this line to your .profile to generate encrypted messages in the console:
alias gpgb="echo '' | vipe | gpg -e --sign -a -r usr1@example.com -r usr2@example.com"You can add extra recipients with -r behind the alias