There are only a few irregular tú commands, and these are irregular only in the affirmative command form. The negative command forms are the same as the tú form of the present subjunctive.
 

decir: di, no digas

hacer: haz, no hagas

ir: ve, no vayas

poner: pon, no pongas

salir: sal, no salgas

ser: sé, no seas

tener: ten, no tengas

venir: ven, no vengas