I-Bash For Loop futhi Ngenkathi Izibonelo zeLuphu

Njenganoma yiluphi olunye ulimi lokubhala, iBash nayo inokwesekwa kwama-loops.

Amaluphu ahle ngokwenza imisebenzi ephindaphindwayo. Singazisebenzisela ama-loops futhi ngenkathi siphambuka kwizikripthi zethu zeBash.



IBash For Loop

I-syntax ye-loop yile:


for VARIABLE in PARAM1 PARAM2 PARAM3 do // scope of for loop done

I-loop izosebenzela ipharamitha ngayinye. Amapharamitha angaba izinombolo, ububanzi bezinombolo noma izintambo, njll.

IBash Yesibonelo Esiyindilinga

Lesi sibonelo esilula siphrinta izinombolo, 1 kuye ku-5 sisebenzisa i-loop:


#!/bin/bash for i in 1 2 3 4 5 do echo '$i' done

Lokukhipha:

1 2 3 4 5

IBash For Loop - Phrinta Ibanga Lezinombolo

Futhi singachaza uhla lwezinombolo ezizodlula kuzo:

Ngokwesibonelo:

for i in {1..5} do echo '$i' done

Lokukhipha:


1 2 3 4 5

IBash Loop Through Strings

Singasebenzisa futhi iluphu ukuvula ngamapharamitha wentambo:

#!/bin/bash for day in MON TUE WED THU FRI SAT SUN do echo '$day' done

Lokukhipha:

MON TUE WED THU FRI SAT SUN

IBash For Loop - C Isitayela

Singasebenzisa futhi i-syntax yesitayela se-C ukubhala i-loop. Ngokwesibonelo:

#!/bin/bash for ((i=1; i<=5; i++)) do echo '$i' done

Umphumela


1 2 3 4 5

OkweLoop Ukuphrinta Uhlu Lwamafayela ku-Directory Yamanje

Ukubala wonke amafayela enkombeni yamanje usebenzisa i-bash for loop, sisebenzisa:

#!/bin/bash for fname in ./ do ls -l $fname done

IBash Ngenkathi I-Loop

IBash nayo iyasekela ngenkathi iluphu. Ngenkathi izingodo zisebenzisa isethi yemiyalo kuze kube yilapho isimo sihlola ukuthi siyiqiniso.

Isi syntax seBash ngenkathi iluphu ingu:

while [condition] do //execute instructions done

Isimo sihlaziywa ngaphambi kokwenza noma imiphi imiyalelo. Ngakho-ke, kuyadingeka ukuthi ube nezindlela zokuvuselela isimo, ngaphandle kwalokho i-loop izosebenza ingunaphakade.


IBash Ngenkathi Isibonelo Esiyindilinga

Okulandelayo iluphu elula ngenkathi iphrinta izinombolo 1 kuye ku-5. I-loop iyanqanyulwa lapho inombolo ingaphezu kuka-5.

#!/bin/bash num=1 while [ $num -le 5 ] do echo '$num' let num++ done

Isitayela seBash C Ngenkathi I-Loop

Njenge-loop, singabhala futhi i-bash ngenkathi ilula ngesitayela se-C njengolimi.

Ngokwesibonelo:

#!/bin/bash num=1 while((num <= 5)) do echo $num let num++ done