IP='130.10.10.10'
NETMASK='255.255.252.0'

l="${IP%.*}";r="${IP#*.}";n="${NETMASK%.*}";m="${NETMASK#*.}"

SUBNET=$((${IP%%.*}&${NETMASK%%.*})).\
       $((${r%%.*}&${m%%.*})).\
       $((${l##*.}&${n##*.})).\
       $((${IP##*.}&${NETMASK##*.}))

l="${SUBNET%.*}";r="${SUBNET#*.}"

BROADCAST=$((${SUBNET%%.*}|256+~${NETMASK%%.*})).\
          $((${r%%.*}|256+~${m%%.*})).\
          $((${l##*.}|256+~${n##*.})).\
          $((${SUBNET##*.}|256+~${NETMASK##*.}))

SUBNET is 130.10.8.0
BROADCAST is 130.10.11.255

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date in unix timestamp: date +%s

convert unix timestamp to date: date --date "Jan 1, 1970 00:00:00 +0000 + $1 seconds"

set date with unix timestamp: date -s "Jan 1, 1970 00:00:00 +0000 + $1 seconds"


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perl -MMIME::Base64 -e 'print encode_base64("string");'

perl -MMIME::Base64 -e 'print decode_base64("c3RyaW5n");'

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Linux Kernel:

modprobe usbmon
mount -t debugfs none_debugs /sys/kernel/debug
cat /sys/kernel/debug/usbmon/<x>t (x=Gerätenummer 1,2,3,...)

libusb with radare/libusbsniff:

LD_PRELOAD=/usr/lib/libusbsniff.so ./my-usb-program

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this one-liner has following benefits:

* restart if pressing ESC (while ! ... ; do true; done)

* store result in a variable not a file (whiptail ... 3>&1 1>&2 2>&3)

while ! choosen=$(whiptail --nocancel --noitem --radiolist "Please choose" \
10 19 3 1 1 2 0 3 0 3>&1 1>&2 2>&3); do true; done

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