umyalo we-echo ku-linux usetshenziselwa ukubonisa umugqa wombhalo/iyunithi yezinhlamvu ezidluliswa njengengxabano . Lona umyalo owakhelwe ngaphakathi osetshenziswa kakhulu kuma-shell scripts namafayela e-batch ukukhipha umbhalo wesimo esikrinini noma efayeleni. I-Syntax : echo [inketho] [string]
Ungayibhala kanjani i-Unix?
I-Echo iyithuluzi lomyalo le-Unix/Linux elisetshenziselwa ukubonisa imigqa yombhalo noma iyunithi yezinhlamvu edluliswa njengezimpikiswano emugqeni womyalo. Lona omunye wemiyalo eyisisekelo ku-linux futhi evame ukusetshenziswa kakhulu kumaskripthi egobolondo. Kulesi sifundo, sizobheka izinketho ezahlukene zomyalo we-echo.
Ngilenza kanjani i-echo ifayela ku-linux?
Umyalo we-echo uphrinta izintambo ezidluliswa njengezimpikiswano kokuphumayo okujwayelekile, okungaqondiswa kabusha kufayela. Ukwakha ifayela elisha sebenzisa umyalo we-echo olandelwa umbhalo ofuna ukuwuphrinta nokusebenzisa u-opharetha wokuqondisa kabusha > ukubhala okukhiphayo efayeleni ofuna ukulenza.
Uyini umyalo we-echo $0 ku-linux?
Njengoba kuchaziwe kulawa mazwana kuleyo mpendulo oxhumanisa nayo, echo $0 kalula ikubonisa igama lenqubo esebenzayo njengamanje: $0 igama lenqubo esebenzayo. Uma uyisebenzisa ngaphakathi kwegobolondo izobuyisela igama legobolondo. Uma uyisebenzisa ngaphakathi kweskripthi, kuzoba yigama lesikripthi.
Uwunanela kanjani umyalo kusikripthi segobolondo?
Umyalo we-echo ubhala umbhalo ekuphumeni okujwayelekile (stdout). I-syntax yokusebenzisa umyalo we-echo ilula kakhulu: lalela [IZINKONDLO] STRING… Okunye ukusetshenziswa okuvamile komyalo we-echo ukuguquguquka kwegobolondo kweminye imiyalo, ukubhala umbhalo ukuze u-stdout kuskripthi segobolondo, nokuqondisa kabusha umbhalo efayeleni.
I-echo isetshenziselwa ini?
I-echocardiogram (i-echo). uhlaka oluyingcaca lokunyakaza kwenhliziyo. Ngesikhathi sokuhlolwa kwe-echo, i-ultrasound (amagagasi omsindo wemvamisa ephezulu) evela entweni ephathwa ngesandla ebekwe esifubeni sakho inikeza izithombe zamavalvu enhliziyo namakamelo futhi isiza i-sonographer ukuthi ihlole isenzo sokumpompa inhliziyo.
Uyini umphumela womyalo kabani?
Incazelo: ubani owayala ukuphuma imininingwane yabasebenzisi okwamanje abangene ngemvume ohlelweni. Okukhiphayo kuhlanganisa igama lomsebenzisi, igama letheminali (angena kulo), usuku kanye nesikhathi sokungena kwabo njll. 11.
Iyini i-echo $PATH ku-Linux?
Bonisa amanye amazwana angu-7. 11. I-$PATH iyi-a imvelo variable ukuthi ihlobene nendawo yefayela. Uma umuntu ethayipha umyalo ozowusebenzisa, isistimu iwubheka ezinhlwini zemibhalo ezicaciswe yi-PATH ngohlelo olushiwo. Ungabuka izinkomba ezishiwo ngokuthayipha i-echo $PATH kutheminali.
Ubhala kanjani nge-echo?
Izimpendulo ze-2
- echo “Ngithola” kunzima ukukubhalela lokhu” > file.txt echo echo “Ngingakwazi “ukubhala” ngaphandle kokucaphuna kabili” >> file.txt.
- echo 'Ngithola" kunzima ukukubhalela lokhu' > file.txt echo echo 'Ngingakwazi "ukubhala" ngaphandle kokucaphuna kabili' >> file.txt.
Iyini i-Echo $1?
$ 1 kuyinto i-agumenti idluliselwe kumbhalo wegobolondo. Ake sithi, usebenzisa ./myscript.sh sawubona 123. bese. I-$1 izoba sawubona.
Uyini umphumela we-echo $0?
$ 0 kuyinto igama lenqubo esebenzayo. Uma uyisebenzisa ngaphakathi kwegobolondo, izobuyisela igama legobolondo. Uma uyisebenzisa ngaphakathi kweskripthi, kuzoba yigama lesikripthi.
Ithini incazelo ye-$0?
$0 inweba egameni legobolondo noma iskripthi segobolondo. Lokhu kusethwe ekuqalisweni kwegobolondo. Uma i-bash icelwa ngefayela lemiyalo, i-$0 isethwe egameni lalelo fayela.