'>=' Umsebenzisi: Okukhulu noma okulingana no-opharetha kubuyisela iqiniso uma i-operand yokuqala inkulu noma ilingana nomsebenzi wesibili futhi ibuyisela ingamanga.
Ubhala kanjani okukhulu noma okulingana ne-UNIX?
[ $a -lt $b ] kuyiqiniso. Ihlola ukuthi ingabe inani le-operand engakwesokunxele likhulu noma lilingana nenani le-operand engakwesokudla; uma kunjalo, isimo siba yiqiniso. [ $a -ge $b ] akulona iqiniso. Ihlola ukuthi ingabe inani le-operand kwesokunxele lingaphansi noma lilingana nenani le-operand engakwesokudla; uma kunjalo, isimo siba yiqiniso.
Yini || kusikripthi segobolondo?
The NOMA Opharetha (||) kufana nesitatimende 'esinye' ohlelweni. I-opharetha engenhla ikuvumela ukuthi wenze umyalo wesibili kuphela uma ukukhishwa komyalo wokuqala kwehluleka, okungukuthi, isimo sokuphuma somyalo wokuqala sithi '1'. … Umyalo wesibili ngeke usebenze.
Wenza kanjani okukhulu kuneLinux?
Bangama-opharetha nje. Simply: gt futhi ngiqonde > (okukhulu kuno) kanye < (ngaphansi kuka).
Ubhala kanjani ngokulinganayo kusikripthi se-bash?
Uma uqhathanisa izintambo ku-Bash ungasebenzisa ama-opharetha alandelayo: intambo1 = intambo2 kanye ne-string1 == string2 – Umsebenzisi wokulingana ubuyisela iqiniso uma ama-operands elingana. Sebenzisa = opharetha ngesivivinyo [ umyalo. Sebenzisa i- == opharetha ngo [[ umyalo wokufanisa iphethini.
Yini i-$? Ku-Unix?
I-$? okuguquguqukayo imele isimo sokuphuma somyalo odlule. Isimo sokuphuma siyinani lenombolo elibuyiswa yinoma yimuphi umyalo lapho uqedwa. … Isibonelo, eminye imiyalo ihlukanisa phakathi kwezinhlobo zamaphutha futhi izobuyisela amanani ahlukahlukene okuphuma kuye ngohlobo oluthile lokwehluleka.
Kuyini && ku-bash?
4 Izimpendulo. "&&" ngu esetshenziswa ukuhlanganisa imiyalo, ukuze umyalo olandelayo uqaliswe uma futhi kuphela uma umyalo owanduleleyo uphume ngaphandle kwamaphutha (noma, ngokunembe kakhulu, uphuma ngekhodi yokubuyisela engu-0).
Uthini umugqa wokuqala weskripthi segobolondo?
Umugqa wokuqala uyasho igobolondo okuthi uma usebenzisa iskripthi ngokuqondile (./run.sh; ngokungafani ne/bin/sh run.sh), kufanele isebenzise lolo hlelo (/bin/sh kulokhu) ukuze ilitolike. Ungayisebenzisa futhi ukuze udlulise izimpikiswano, ngokuvamile -e (ukuphuma ngephutha), noma usebenzise ezinye izinhlelo (/bin/awk, /usr/bin/perl, njll).
Kuyini << ku-Linux?
Umyalo one- << opharetha uzokwenza izinto ezilandelayo : Yethula uhlelo olucaciswe kwesokunxele sesisebenzisi, ikati ngokwesibonelo. Bamba okokufaka komsebenzisi, okufaka phakathi imigqa emisha, kuze kube yilapho okucaciswe kwesokudla sesisebenzisi kuhlangatshezwana naye kulayini owodwa, ngokwesibonelo, i-EOF.
Yenzani i-$? Kusho ukuthini ku-Linux?
$? -Isimo sokuphuma somyalo wokugcina owenziwe. $0 -I igama lefayela lombhalo wamanje. $# -Inani lama-agumenti anikezwe iskripthi. $$ -Inombolo yenqubo yegobolondo lamanje. Ngemibhalo yegobolondo, lena i-ID yenqubo abasebenzisa ngaphansi kwayo.
Yenzani lezi ezimbili ezinkulu kunezimpawu ku-Linux?
Ukuqondisa kabusha noma yimiphi imilayezo yephutha iphutha. log kanye nezimpendulo ezijwayelekile zefayela lokungena okulandelayo kuzosetshenziswa. Okukodwa okukhulu kuno-(>) kungathathelwa indawo uphawu olukhulu oluphindwe kabili kunophawu (>>) uma ungathanda ukuthi okuphumayo kufakwe kufayela kunokuba ubhale phezu kwefayela.
Kusho ukuthini okuncane kunokushiwo ku-Linux?
Uphawu olungaphansi kuno-(<) kubangela ukuthi uhlelo luthole okokufaka kufayela lezinto esikhundleni sokulinda okokufaka kwekhibhodi. Uphawu olukhulu kuno-(>) ngakolunye uhlangothi, luqondisa kabusha okukhiphayo kufayela esikhundleni sokuya kukhonsoli.