Uyisebenzisa kanjani i-loop yesikhashana ku-Linux?

Uyibhala kanjani i-loop yesikhashana ku-Linux?

I-syntax ye-loop ngenkathi:

1. n=1. kuyilapho i-[ $n -le 5] yenza. echo “Ukusebenzisa isikhathi esingu-$n” (( n++ )) kwenziwe.
2. n=1. kuyilapho i-[ $n -le 10] yenza. uma [ $n == 6] bese. echo "kunqanyuliwe" ikhefu. fi. echo “Isikhundla: $n” (( n++ )) kwenziwe.
3. n=0. kuyilapho i-[ $n -le 5] yenza. (( n++ )) uma [ $n == 3] ngaleso sikhathi. qhubeka. fi. phinda okuthi “Isikhundla: $n” kwenziwe.

Uyisebenzisa kanjani i-loop yesikhashana ku-Unix?

I-syntax. Lapha umyalo weShell uyahlolwa. Uma inani eliwumphumela liyiqiniso, i(izi)tatimende ezinikeziwe ziyasetshenziswa. Uma umyalo ungamanga asikho isitatimende esizokwenziwa futhi uhlelo luzogxumela emugqeni olandelayo ngemva kwesitatimende esenziwe.

Uyisebenzisa kanjani i-loop yesikhashana?

The while loop evaluates the test expression inside the parenthesis () . If the test expression is true, statements inside the body of while loop are executed. Then, the test expression is evaluated again. The process goes on until the test expression is evaluated to false.

How do I read a while loop in Linux?

The following syntax is used for bash shell to read a file using while loop:

1. while read -r line; do. echo “$line” ; done < input.file.
2. while IFS= read -r line; do. echo $line; done < input.file.
3. $ while read line; do. echo $line; done < OS.txt.
4. #!/bin/bash. filename=’OS.txt’ n=1. …
5. #!/bin/bash. filename=$1. while read line; do.

Uyimisa kanjani iluphu engapheli ku-Linux?

Okungapheli ngenkathi i-Loop

Ungasebenzisa futhi isitatimende esakhelwe ngaphakathi sangempela noma esinye isitatimende esihlala sibuyisela iqiniso. I-loop yesikhathi engenhla izosebenza unomphela. Unganqamula iluphu ngokucindezela u-CTRL+C .

Uyivala kanjani iluphu yesikhashana?

Iluphu yesikhashana inganqanyulwa lapho ikhefu, i-goto, noma imbuyekezo ngaphakathi kwendikimba yesitatimende kukhishwa. Sebenzisa ukuqhubeka ukuze unqamule ukuphindaphinda kwamanje ngaphandle kokuphuma ku-loop yesikhathi. qhubeka udlulisela ukulawula ekuphindaphindweni okulandelayo kweluphu yesikhathi. Isimo sokunqanyulwa sihlolwa phezulu kweluphu.

Uyibhala kanjani i-loop ku-Unix?

Lapha i- var igama lokuguquguquka futhi elithi1 kuya ku-wordN ukulandelana kwezinhlamvu ezihlukaniswa yizikhala (amagama). Ngaso sonke isikhathi lapho i-loop iqalisa, inani le-variable var lisethwa egameni elilandelayo ohlwini lwamagama, elithi1 kuya elithiN.

Yimaphi amagama angukhiye kulawa alandelayo asetshenziswa ngenkathi iluphu?

Lapha, sinamagama angukhiye amathathu, okungukuthi ngenkathi, yenza futhi yenziwe. Igama elingukhiye lokuqala elithi 'ngenkathi' libonisa ukuqala kweluphu lapho sisebenzisa umbhalo wegobolondo. Ilandelwa yisimo esifakwe kubakaki abayindilinga.

Yiziphi izihibe ku-Linux?

I-loop ingeyokuqala kwezintathu zokwakhiwa kwegobolondo looping. Le loop ivumela ukucaciswa kohlu lwamanani. Uhlu lwemiyalo luyenziwa ngevelu ngayinye ohlwini. I-syntax yale loop ithi: ye-NAME [ku-LIST ]; yenza IMIYALELO; kwenziwe.

Siyini isibonelo se-loop ngenkathi?

Iluphu ethi “Ngenkathi” isetshenziselwa ukuphinda ibhulokhi ethile yekhodi izikhathi ezingaziwa, kuze kube yilapho kuhlangatshezwana nesimo. Isibonelo, uma sifuna ukucela inombolo ephakathi kuka-1 no-10 kumsebenzisi, asazi ukuthi umsebenzisi angafaka kangaki inombolo enkulu, ngakho sihlala sibuza ukuthi “kuyinkathi inombolo ingekho phakathi kuka-1 no-10”.

Siyini isibonelo se-Loop?

Iluphu isetshenziselwa ukwenza ibhulokhi yezitatimende ngokuphindaphindiwe kuze kube yilapho isimo esithile saneliswa. Isibonelo, uma ubonisa inombolo ukusuka ku-1 kuye ku-100 ungase ufune ukusetha inani lokuguquguqukayo liye ku-1 futhi uyibonise izikhathi ezingu-100, ukhuphule inani layo ngo-1 ekuphindaphindweni kweluphu ngakunye.

What does while loop mean?

Ezilwimini eziningi zohlelo lwekhompuyutha, i-do while loop iyisitatimende sokugeleza kokulawula esisebenzisa ibhulokhi yekhodi okungenani kanye, bese iphinda ikhiphe ibhulokhi, noma iyeke ukuyifeza, kuye ngesimo esinqunyiwe se-boolean ekugcineni kwebhulokhi. .

Ithini incazelo ku-Linux?

Kuhla lwemibhalo lwamanje kunefayela elibizwa ngokuthi “mean.” Sebenzisa lelo fayela. Uma lokhu kuwumyalelo wonke, ifayela lizokwenziwa. Uma kungukuphikisana komunye umyalo, lowo myalo uzosebenzisa ifayela. Isibonelo: rm -f ./mean.

Uyenza kanjani i-loop yesikhashana ku-bash?

Ayikho i-loop yokwenza ngenkathi ku-bash. Ukwenza umyalo kuqala bese ugijima iluphu, kufanele wenze umyalo kanye ngaphambi kweluphu noma usebenzise iluphu engapheli enesimo sekhefu.

Ulifunda kanjani ifayela ku-Linux?

Nazi ezinye izindlela eziwusizo zokuvula ifayela kutheminali:

1. Vula ifayela usebenzisa umyalo wekati.
2. Vula ifayela usebenzisa umyalo omncane.
3. Vula ifayela usebenzisa umyalo owengeziwe.
4. Vula ifayela usebenzisa umyalo we-nl.
5. Vula ifayela usebenzisa umyalo we-gnome-open.
6. Vula ifayela usebenzisa umyalo wekhanda.
7. Vula ifayela usebenzisa umyalo womsila.