Ulibhala njani ixesha kwi-loop kwi-Linux?
Syntax of while loop:
- n=1. while [ $n -le 5 ] do. echo “Running $n time” (( n++ )) done.
- n=1. while [ $n -le 10 ] do. if [ $n == 6 ] then. echo “terminated” break. fi. echo “Position: $n” (( n++ )) done.
- n=0. while [ $n -le 5 ] do. (( n++ )) if [ $n == 3 ] then. continue. fi. echo “Position: $n” done.
How do you use a while loop in Unix?
Isivakalisi. Apha umyalelo weShell uyavavanywa. Ukuba ixabiso lesiphumo liyinyaniso, iingxelo ezinikiweyo ziyaphunyezwa. Ukuba umyalelo awuyonyani ke akukho ngxelo iza kuphunyezwa kwaye inkqubo iyakutsibela kumgca olandelayo emva kwengxelo eyenziweyo.
How do you use a while loop?
The while loop evaluates the test expression inside the parenthesis () . If the test expression is true, statements inside the body of while loop are executed. Then, the test expression is evaluated again. The process goes on until the test expression is evaluated to false.
How do I read a while loop in Linux?
The following syntax is used for bash shell to read a file using while loop:
- while read -r line; do. echo “$line” ; done < input.file.
- while IFS= read -r line; do. echo $line; done < input.file.
- $ while read line; do. echo $line; done < OS.txt.
- #!/bin/bash. filename=’OS.txt’ n=1. …
- #!/bin/bash. filename=$1. while read line; do.
Umisa njani iluphu engapheliyo kwiLinux?
Okungapheliyo ngelixa iLoop
Ungasebenzisa kwakhona inyani eyakhelwe-ngaphakathi okanye nayiphi na enye ingxelo ehlala ibuyisela inyani. I-loop loop ingentla iya kuqhuba ngokungenasiphelo. Unako ukuphelisa iluphu ngokucinezela CTRL+C.
Uyivala njani loop yethutyana?
Ilophu yexesha inokuphelisa xa ikhefu, i-goto, okanye imbuyekezo ngaphakathi kwebhodi yengxelo yenziwe. Sebenzisa qhubeleka ukuphelisa iteration yangoku ngaphandle kokuphuma ngexesha loop. qhubeleka nokudlulisa ulawulo kuphindaphindo olulandelayo lwelophu yexesha. Umqathango wokuphelisa uvavanywa phezulu kwiluphu.
Uyibhala njani i-loop kwi-Unix?
Apha var ligama loguquguquko kunye negama1 ukuya kwigamaN lulandelelwano lwabalinganiswa abahlulwe zizithuba (amagama). Ngalo lonke ixesha i-loop iphumeza, ixabiso le-variable var icwangciswa kwigama elilandelayo kuluhlu lwamagama, i-word1 ukuya kwi-wordN.
Ngawaphi amagama angundoqo alandelayo asetyenziswa ngexesha loop?
Apha, sinamagama angundoqo amathathu, angala ngelixa, yenza kwaye wenze. Igama lokuqala elingundoqo 'ngelixa' libonisa isiqalo seluphu xa siqhuba umbhalo weqokobhe. Ilandelwa yimeko evalelwe kwizibiyeli ezingqukuva.
Yintoni iilophu kwiLinux?
I-loop yeyokuqala kulwakhiwo lweqokobhe oluthathu. Le loop ivumela ukuchazwa koluhlu lwamaxabiso. Uluhlu lwemiyalelo luphunyeziwe kwixabiso ngalinye kuluhlu. Isivakalisi sale loop sithi: ye NAME [kuLUHLU ]; yenza IMIYALELO; kwenziwe.
What is while loop example?
A “While” Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. For example, if we want to ask a user for a number between 1 and 10, we don’t know how many times the user may enter a larger number, so we keep asking “while the number is not between 1 and 10”.
Yintoni umzekelo weLoop?
A loop is used for executing a block of statements repeatedly until a particular condition is satisfied. For example, when you are displaying number from 1 to 100 you may want set the value of a variable to 1 and display it 100 times, increasing its value by 1 on each loop iteration.
What does while loop mean?
Kuninzi lweelwimi zenkqubo yekhompyuter, i-loop yingxelo yokuqukuqela yolawulo eyenza ibhloko yekhowudi nokuba kanye, kwaye emva koko iphumeze ngokuphindaphindiweyo ibhloko, okanye iyeke ukuyiphumeza, ngokuxhomekeke kwimeko enikiweyo ye-boolean ekupheleni kwebhloko. .
Ithini intsingiselo kwiLinux?
Kuluhlu lwangoku kukho ifayile ebizwa ngokuba yi "mean." Sebenzisa loo fayile. Ukuba lo ngumyalelo wonke, ifayile iya kuphunyezwa. Ukuba yimpikiswano komnye umyalelo, loo myalelo uya kusebenzisa ifayile. Umzekelo: rm -f ./mean.
Wenza njani i-loop ngexesha kwi-bash?
Akukho loop yokwenza-ngexesha kwi-bash. Ukwenza umyalelo kuqala emva koko ubaleke iluphu, kufuneka wenze umyalelo kube kanye phambi kweluphu okanye usebenzise iluphu engapheliyo enemeko yokwaphuka.
Uyifunda njani ifayile kwiLinux?
Ezi zilandelayo zezinye iindlela eziluncedo zokuvula ifayile kwi-terminal:
- Vula ifayile usebenzisa umyalelo wekati.
- Vula ifayile usebenzisa umyalelo omncinci.
- Vula ifayile usebenzisa umyalelo ongaphezulu.
- Vula ifayile usebenzisa umyalelo we-nl.
- Vula ifayile usebenzisa i-gnome-open command.
- Vula ifayile usebenzisa umyalelo wentloko.
- Vula ifayile usebenzisa umyalelo womsila.