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#exit if user is not root
[ "$(id -u)" != "0" ] && { echo "Must be run as root! Aborting"; exit 1;}

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YYYYMMDDhhmmss=$(date +%Y%m%d%H%M%S)
echo $YYYYMMDDhhmmss
# will output 20120604164021

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[[ "hello" =~ ^h.[a-z]{2,3}[^[:digit:][:alpha:]]$ ]] && echo "match"

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# I want to *snoop* the stdout(1) and stderr(2) of the process named 'ntfsresize'
# (run as root)
strace -p $(pidof "ntfsresize") -e trace=write 2>&1 | grep 'write(1'
       
# Explanation:
#
#      -p $(pidof "ntfsresize") 
#      Apply strace to the process named "ntfsresize"
#      If you want to trace a bash script, use instead $(pidof -x "script-name.sh")
#

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sudo adduser user_x group_z
# and now logout/relogin for changes to take effect

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#PROLOGUE: all this should be run as root, otherwise stated

#update && upgrade:
apt-get update && apt-get upgrade -y

#create a new user
adduser user_x

#create group admin (funny enough, it does not exist, although its accounted in the /etc/sudoers file):
addgroup --system admin

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# See "man 5 crontab"
#
# Instead of the first five fields, one of eight special strings may appear:
#       string         meaning
#       ------         -------
#       @reboot        Run once, at startup.
#       @yearly        Run once a year, "0 0 1 1 *".
#       @annually      (same as @yearly)
#       @monthly       Run once a month, "0 0 1 * *".
#       @weekly        Run once a week, "0 0 * * 0".

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#Become user_x, with a login environment
su - user_x

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#Run command as user_x, within a login environment
sudo -u user_x -i echo This is my command and should not be quoted

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#Add this to /etc/fstab
/dev/sda1 /Windows ntfs-3g defaults,uid=1000,gid=1000,dmask=027,fmask=137 0 0