[ Cov ntaub ntawv ] qhov loj me

☞ x ≔ Cov ntaub ntawv tshiab: (Qhov chaw nyob /tmp: ‘a.txt’).
x sau ntawv: ‘abc’.
✎ sau ntawv: x qhov loj me, tsum.
x txuas ntxiv: ‘def’.
✎ sau ntawv: x qhov loj me, tsum.
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