Brevis pimentorum que in domo esse debeant

cookbook.txt

# 88
echo '======================================================================================='

# 80
echo '==============================================================================='

# 75
echo '=========================================================================='

# 72
echo '======================================================================='

# 70
echo '====================================================================='

# one megabyte is one million bytes
# (2^10)^2
declare -rx LIMIT_64MB=$(( 1048576 * 64 ))

# display applications using ipv6
netstat -lp -6

# use paste instead of tr to pretty print a list into a row
dpkg -l | grep sasl | awk '{print$2}' | paste -sd' '

# use column to evenly justify a space or tab delimited file
column -t file1
# use column to evenly justify a csv file
column -t -s, file2
# Get the process id of a process
pidof $1
pgrep $1

# Use "date +$DATE4FILE" to create a file name based on the time
DATE4FILE='%Y%m%d%H%M%S'
# easier to read
DATE4READ='%Y-%m-%d_%H:%M:%S'

# outputs 'servername was restarted x days ago'
echo "$HOSTNAME was restarted $(uptime | tr , ' ' | awk '{print $3" "$4}') ago"

# trim some fat
| head -2 | tail -1

# find newish files
touch -t "$(date '+%Y%m%d0000')" datestamp && find / -newer ./timestamp -print

# check the existence of a named process
[ "$(type -t type)" ] && echo true || echo false

# display users home directory path
grep $USER /etc/passwd | cut -d: -f 6
getent passwd $UID | cut -d: -f 6

# display users default shell
getent passwd $UID | cut -d: -f3,7 | grep "^${UID}:"
echo $SHELL
echo $BASH_VERSION
cat /proc/$$/cmdline
ls -l /proc/$$/exe

# track start and end time of a script
start="$(date +%s)"
end="$(date +%s)"
diff="$(expr $end - $start)"
echo "Started at $start : Ended at $end"
echo "Elapsed time = $diff seconds"
# same as above with bash builtin
# echo "$BASH_SECONDS"

# duration of visitation by IP
grep "^12.106.111.10 " access_log | grep -vw css | grep -vw gif | grep -vw jpg | grep -vw png | grep -vw ico | awk '{ print $4,$7 }' | cut -c2-
grep "^12.106.111.10 " /var/log/apache2/access_log | egrep -vw 'css|gif|jpg|png|ico' | awk '{ print $4,$7 }' | cut -c2-

# unique visitors
cut -d" " -f1 /var/log/apache2/access_log | sort -u

# display width of terminal
echo "$(stty size | cut -d" " -f2)"
# /usr/openwin/bin/resize sets COLUMNS
echo "$COLUMNS"

# display threads associated with a PID
ps -e -T | grep $(pidof firefox)
# count them
ps -e -T | grep $(pidof firefox) | wc -l

# limit cpu use usage of a running process
## -l is the limit from 0 to 100
cpulimit -p PID -l 50
# limit using path to the executable
cpulimit -P /usr/bin/whoami -l 50

# make a copy of the repositories used for installation of packages
cp /etc/apt/sources.list $HOME/repo_sources.list

# display list of installed packages
dpkg --get-selections | egrep -v 'deinstall|hold|purge' | awk '{print $1}'
# output list of installed packages to a file
dpkg --get-selections | egrep -v 'deinstall|hold|purge' > installedpackages.txt

# install packages from a file
apt-get update
dpkg --set-selections < installedpackages.txt
apt-get dselect-upgrade

# oneliner install packages from a file
cat installedpackages.txt | xargs -a installedpackages.txt sudo aptitude install

# install packages onto a computer without internet from a cd or thumbdrive
apt-get install aptoncd

# benchmark hdd
hdparm -t /dev/sda

# storage space used by directory - alias?
du -s * 2>/dev/null | sort -n | cut -f2 | xargs du -sh 2>/dev/null

# install 64bit tor browser
wget https://www.torproject.org/dist/torbrowser/5.5/tor-browser-linux64-5.5_en-US.tar.xz
tar -xvJf tor-browser-linux64-5.5_en-US.tar.xz
cd tor-browser_en-US
./start-tor-browser.desktop

# install 32bit tor browser
wget https://www.torproject.org/dist/torbrowser/5.5/tor-browser-linux32-5.5_en-US.tar.xz
tar -xvJf tor-browser-linux32-5.5_en-US.tar.xz
cd tor-browser_en-US
./start-tor-browser.desktop