Ask YC: What are the command line tools you can't live without?
Obviously, tools like 'ls' will be in everyone's repertoire. Looking for some possibly obscure or under-utilized tools here.
socat is the swiss army knife that just about lets you forget everything's not a file:
$ socat readline: file:/dev/ttyS0,crnl,crtscts,echo=0 # interact with a serial port
$ socat readline: tcp:google.com:80 # interact with a tcp port
$ socat tcp-listen:1234,fork exec:cat # a forking cat service
apt-cache search --names-only <name>
less -S
free -m
time
host
Some of us have moved away from some of these arcane methods of interaction.
They call it progress you know...
:-)