perl -lane 'short script'
find [....] -print0 | xargs -0 cmd
( set -e ; cmd1; cmd2; cmd3 ) && killall some-daemon
ps -C cmd
lsof -c cmd
$(( arithmetic ))
for n in [...] ; do cmd $n ; done
some-command | grep | while read n ; do cmd $n ; done
lshw combines lspci, lsusb, lshal, lspcmcia and more. Forgot what motherboard a server has? lshw knows. What size/manufacture/number of DIMMs you installed? lshw knows. What version of BIOS? lshw might know. Under CentOS you have to get it from RPMForge.
One should learn variable expansion syntax if one spend any time with bash.
And yes, I do type while and for loops at the command line.