virullius

echo "syntax for base conversion in bash is: \$((\$BASE#\$VALUE))"
echo

echo "Decimal value of Hexadecimal 2B: \$((16#2B))"
echo $((16#2B))
echo

echo "Decimal value of binary 0110: \$((2#0110))"
echo $((2#0110))
echo

virullius

# trick is to match on a non-printing character (^ is beginning of line) OR your pattern.
# this way all lines match but only your pattern containing printable characters will be highlighted
# using ^ requires Extended-Regexp option (-E)
grep -E '^|pattern' file.log

virullius

exec su -l $USER

virullius

Install MS Office 2010 Pro 32 bit on LinuxMint 17 (Ubuntu 14.04)

install prerequisite winbind

sudo apt-get install winbind

create prefix

WINEPREFIX=/home/<username>/.wine-<myprefix> WINEARCH=win32 wine 'wineboot'

virullius

kill -0 $(ps -eo pid,command | grep nginx | grep master | awk  -F ' ' '{print $1}')

virullius

# default nice value seems fine in my case; ionice has no default, using class 3 for idle IO time
ionice -c 3 nice tar ~/the-webapp-20150106.tgz /opt/the-webapp

virullius

host $(host $THE_DNSNAME | awk -F ' ' '{print $4}')

virullius

ssh user@host 'bash -s' < /path/to/my-script.sh

virullius

ip addr show | grep 'inet ' | grep -v -E 'lo$' | awk -F ' ' '{print $NF, "\t", $2}'

virullius

# view MBR with partition table
sudo dd if=/dev/sda bs=512 count=1 | hexdump -C
# backup MBR without partition table
sudo dd if=/dev/sda of=mbr.backup bs=446 count=1