For explanations on what all of these commands do, read their help files. For example type "Help filch" in the mud. For a few commands, I have also included an brief explanation here.
Backstab, Only Thieves and Assassins can get this, you need co.st level 60 and co.it.we level 60.
Ambush, Anyone can get this, you need co.st level 60 and co.it.we level 60.
Abscond, Only Thieves and Assassins can get this, you need Co.st level 50. Some dodge would also be good if you want to pull it off succesfully.
Case, Thief only, you need Co.ca.pe level 30.
Conceal, Only Thieves and Assassins can get this, you need Co.hi.ob level 30.
Crack, Thief only, you need Co.lo.sa level 60.
Disable, Only Thieves and Assassins can get this, you need Co.it.tr level 60 and Co.lo.tr level 60.
Filch, Thief only, you need Co.ma.st level 150.
Hide, Anyone can get this, however only thieves and assassins tend to be any good at it, you need Co.hi.pe level 10.
Lpick, Anyone can get this, however only thieves and assassins tend to be any good at it, you need Co.lo.do level 60.
Palm, Anyone can get this, however only thieves tend to be any good at it, you need Co.Ma.Pal level 3.
Peek, Anyone can get this, however only thieves and assassins tend to be any good at it, you need Co.st level 10.
Plant, Anyone can get this, however only thieves tend to be any good at it, you need Co.ma.pas level 5.
Probe, Only Thieves and Assassins can get this, you need Co.it.tr level 20 and Co.ca.pl level 60.
Scope, Thief only you need Co.ca.pl level 30.
Shoplift, Anyone can get this, however only thieves tend to be any good at it, you need Co.ma.st level 15.
Slip, Anyone can get this, however only thieves tend to be any good at it, you need Co.ma.pas level 3.
Snatch, Anyone can get this, however only thieves tend to be any good at it, you need Co.ma.st level 5.
Sneak, Anyone can get this, however only thieves and assasssins tend to be any good at it, you need Co.st level 10.
Steal, Anyone can get this, however only thieves and assassins tend to be any good at it, you need Co.ma.st level 20.
Unhide, Thief and Assassin only, you need co.st level 20.