Quora thread snippets

shell_games.sh

cat a b | sort | uniq > c   # c is a union b
cat a b | sort | uniq -d > c   # c is a intersect b
cat a b b | sort | uniq -u > c   # c is set difference a - b

find . -type f -ls

find . -name \*.py | xargs grep some_function
cat hosts | xargs -I{} ssh root@{} hostname

cat access.log | egrep -o 'acct_id=[0-9]+' | cut -d= -f2 | sort | uniq -c | sort -rn


ps aux | grep mypattern | awk '{ print $2}' | xargs kill

pkill -f mypattern

# Top ten running processes sorted by memory usage
ps aux | sort -nk +4 | tail

diff -y