[ Cov-ntaub-ntawv ] rho-tawm

var x := Cov-ntaub-ntawv tshiab: (Qhov-chaw-nyob /tmp: ['a.txt']).
x sau-ntawv: ['abc'].
Stdout sau-ntawv: x muaj-nyob, tsum.
x rho-tawm.
Stdout sau-ntawv: x muaj-nyob, tsum.
Muaj-tseeb
Tsis-tseeb