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Fun bash one liners

Remove all tab characters

tr -d '\t'

Find lines containing literal tabs

awk '/\t/'

grep -P

Join files using a tab separator

join -t $'\t' file1 file2

A simple awk for isolating columns

awk '{print $2}'

Simple system benchmarks

yes | sed '=' | sed '/y/d'

time seq -n 1e6

Print a few random numbers

od -d < /dev/random | awk '{ print $2 }' | head

What shell am I using?

lsof -p $$

See which processes are listening to a $PORT

netstat -pntl | grep $PORT # linux

lsof -nP -iTCP:$PORT | grep LISTEN # os x

Useful flags for rsync

rsync -h --progress --stats --verbose

Recover files from a slightly corrupted tar archive

cpio -ivd -H tar < file.tar