Some really great tips several of which I’m now using, some I learned from others, but all very useful.
Now in my .bashrc:
alias gps='ps aux | grep $1'
alias gls='ls -la $1 | grep $2'
Surely more as time goes on, but I often grep ps for a pid (or three) and grep ls to avoid scrolling/get rid of the noise.
To clarify his #10, you only type the substitution and it’s applied on the last command and then run. The bash manpage says: