process : ps
files : ls
package manager : pm list packages -f
netstat
printenv
netcfg
cd

start an activity (see on the device) :

link : am start 'http://www.wikipedia.org'
facebook : am start -a android.intent.action.VIEW -d facebook://facebook.com/inbox
start tracetool service : am broadcast -a TTServiceStart
start tracetool intent : am start -a android.intent.action.MAIN -n service.tracetool/service.tracetool.MainServiceActivity
