One Liners

Unset (http) env vars

Only if you trust your environment, mind.
eval $(env | grep -i http | sed 's/^/unset /; s/=.*//')

Core Count

cat /proc/cpuinfo | egrep "core id|physical id" | tr -d "\n" | sed s/physical/\\nphysical/g | grep -v ^$ | sort | uniq | wc -l

Socket Count

cat /proc/cpuinfo | grep "physical id" | sort | uniq | wc -l

Iterate through arrays in bash

for i in ${!ARR[@]}; do echo ${ARR[$i]}; done

Restrict outgoing bandwidth on Linux

burst is ((<rate in bits/s> / ) / 8) `latency` is the amount of data to queue before dropping traffic `tc qdisc add dev bond1 root tbf rate 4.5gbit burst 562500 latency 100ms` Remove: `tc qdisc del dev bond1 root`