Iwashi lomyalo we-Linux ugijima umyalo ngokuphindaphindiwe, ukubonisa okukhiphayo (okubukeka kuqala). Lokhu kukuvumela ukuba ubuke umkhiqizo wokuguqulwa kohlelo ngokuhamba kwesikhathi. Ngokuzenzakalelayo, uhlelo lusebenza njalo ngemva kwemizuzwana emibili; sebenzisa -n noma -interval ukucacisa isikhathi esithile.
I- ididi noma i-flagdiff flag izogqamisa umehluko phakathi kokubuyekezwa okulandelanayo. Inketho yokuhlenga iveza ukugqamisa "okunamathelayo", ukuveza ukubonisa okusebenzayo kwazo zonke izikhundla eziye zashintsha.
Ukubuka kuzosebenza kuze kuphazamiseke.
Isiqephu se-Linux Watch Command
buka i- [-dhv] [-n
Qaphela
Qaphela ukuthi umyalo unikezwa ku- "sh -c" okusho ukuthi kungase kudingeke usebenzise ukucaphuna okungeziwe ukuze uthole umphumela oyifunayo.
Qaphela ukuthi ukusetshenzwa kokukhetha kwe-POSIX kusetshenziswa (okungukuthi, ukukhethwa kokukhethwa kokukhethwa kuzo ku-ingxabano yokuqala engeyona inketho). Lokhu kusho ukuthi amafulegi emva komyalo awutholi ukuhunyushwa ngamehlo ngokwawo.
Izibonelo ze-Linux Watch Command
Ukuze ubuke ngeposi, ungase wenze:
buka-60 kusuka
Ukuze ubuke okuqukethwe kokuguqulwa komqondisi, ungasebenzisa:
bukela -d ls -l
Uma unesithakazelo kuphela kumafayela aphethwe ngumsebenzisi joe, ungasebenzisa:
bukela -d 'ls -l | fgrep joe '
Ukubona imiphumela yokucaphuna, zama lokhu:
buka i-echo $$
buka i-echo '$$'
buka i-echo "'"' $$ '"'"
Okubalulekile: Sebenzisa umyalo womuntu ( % umuntu ) ukuze ubone ukuthi umyalo usetshenziswe kanjani kukhompyutha yakho ethile.