Cov ntaub ntawv

☞ f ≔ Cov ntaub ntawv tshiab: (Qhov chaw nyob /tmp: ‘test.txt’).
f sau ntawv: ‘test’.
☞ q ≔ Cov ntaub ntawv tshiab: (Qhov chaw nyob /tmp: ‘test.txt’).
✎ sau ntawv: q nyeem, tsum.
test