[ Cov ntaub ntawv ] rho tawm

☞ x ≔ Cov ntaub ntawv tshiab: (Qhov chaw nyob /tmp: ‘a.txt’).
x sau ntawv: ‘abc’.
✎ sau ntawv: x muaj nyob, tsum.
x rho tawm.
✎ sau ntawv: x muaj nyob, tsum.
Muaj tseeb
Tsis tseeb