zipizap

#Become user_x, with a login environment
su - user_x

zipizap

# 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".

zipizap

#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

zipizap

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

zipizap

# 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")
#

zipizap

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

zipizap

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

zipizap

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

zipizap

function shw_grey { echo -e '\033[1;30m'"$1"'\033[0m'; }
function shw_norm { echo    "$1"; }
function shw_info { echo -e '\033[1;34m'"$1"'\033[0m'; }
function shw_warn { echo -e '\033[1;33m'"$1"'\033[0m'; }
function shw_err  { echo -e '\033[1;31mERROR: '"$1"'\033[0m'; }

shw_grey "Blablabla nothing interesting..."
shw_norm "I reclaim some attention, but still within normality"
shw_info "I'm an info message - I stand out"
shw_warn "We must fix our economic system"

zipizap

$ sudo visudo
#add the following to the end of the file:

#allow user "zipizap" to use "sudo /usr/bin/aptitude" without asking for password
zipizap ALL = NOPASSWD: /usr/bin/aptitude

#save and close the edited file