Yintoni imeko yokuphuma kwi-Unix?

Wonke umyalelo we Linux okanye we Unix owenziwe liqokobhe elishicilelweyo okanye umsebenzisi unemo yokuphuma. Ubume bokuphuma linani elipheleleyo. 0 isimo sokuphuma sithetha ukuba umyalelo ube yimpumelelo ngaphandle kweempazamo. A non-zero (1-255 amaxabiso) isimo sokuphuma kuthetha ukuba umyalelo wawusilele.

Yintoni imeko yokuphuma kwiLinux?

Ubume bokuphuma bomyalelo ophunyeziweyo ngu ixabiso elibuyiswe yinkqubo yokulinda umnxeba okanye umsebenzi olinganayo. Ubume bokuphuma buwela phakathi kwe-0 kunye ne-255, nangona, njengoko kucacisiwe ngezantsi, iqokobhe linokusebenzisa ixabiso elingaphezulu kwe-125 ngokukodwa. Imilinganiselo yokuphuma kwiqokobhe lokwakhiwa kweqokobhe kunye nemiyalelo ekhompawundi nazo zilinganiselwe kolu luhlu.

Ithini imeko yokuphuma yomyalelo?

Emva kokuba umbhalo uphelisiwe, i-$? kwilayini yomyalelo inika imeko yokuphuma yescript, oko kukuthi, umyalelo wokugqibela owenziweyo kwiscript, oko kukuthi, ngokwesiqhelo, 0 kwimpumelelo okanye inani elipheleleyo kuluhlu 1 - 255 kwimpazamo. #!/bin/bash echo molo echo $? # Imo yokuphuma 0 ibuyisiwe kuba umyalelo wenziwe ngempumelelo.

Yintoni ukuphuma ku-0 kwaye uphume ngesi-1 kwiskripthi seqokobhe?

ukuphuma (0) ibonisa ukuba inkqubo iphelisiwe ngaphandle kweempazamo. ukuphuma(1) kubonisa ukuba bekukho impazamo. Ungasebenzisa amaxabiso ahlukeneyo ngaphandle kwe-1 ukwahlula phakathi kweempazamo ezahlukeneyo.

Uyijonga njani imeko yokuphuma kwi-Unix?

Ngoku ukubona imeko yokuphuma yomyalelo we-cal umyalelo olandelayo: $ echo $? Bonisa imo yokuphuma yomyalelo: $ echo $?

Ndiyifumana njani ikhowudi yokuphuma kwiLinux?

Ukujonga ikhowudi yokuphuma singakwazi ngokulula uprinte i-$? utshintsho olukhethekileyo kwi-bash. Oku kuguquguquka kuya kuprinta ikhowudi yokuphuma yomyalelo wokugqibela. Njengoko unokubona emva kokwenza umyalelo ./tmp.sh ikhowudi yokuphuma ibe ngu-0 ebonisa impumelelo, nangona umyalelo wokuchukumisa usilele.

Ndingasijonga njani isimo sam sokuphuma?

Wonke umyalelo osebenzayo unesimo sokuphuma. Oko kukhangela kujonge ubume bokuphuma kwe umyalelo ogqitywe mva nje phambi kokuba layini iqhube. Ukuba ufuna ukuba iskripthi sakho siphume xa olo vavanyo lubuya luyinyani (umyalelo wangaphambili awuphumelelanga) emva koko ubeke ukuphuma oku-1 (okanye nantoni na) ngaphakathi ukuba ibhloko emva kwe-echo.

Yintoni i-$? Ngo bash?

$? lutshintsho olukhethekileyo kwi-bash leyo ihlala ibambe ikhowudi yokubuya/yokuphuma yomyalelo wokugqibela owenziweyo. Ungayijonga kwi-terminal ngokusebenzisa i-echo $? . Iikhowudi zokubuya zikuluhlu [0; 255]. Ikhowudi yokubuya engu-0 idla ngokuthetha ukuba yonke into ilungile.

Yintoni i-bash set?

set ngu iqokobhe elakhiweyo, esetyenziselwa ukuseta kunye nokungaseti iinketho zeqokobhe kunye neeparamitha zendawo. Ngaphandle kweengxoxo, iseti iya kuprinta zonke izinto eziguquguqukayo zeqokobhe (zombini izinto eziguquguqukayo zemekobume kunye neziguquguqukayo kwiseshoni yangoku) zibekwe kwindawo yangoku. Unako kwakhona ukufunda amaxwebhu bash.

Yintoni umahluko phakathi kokuphuma ku-0 kunye nokuphuma ku-1?

Ukuphuma (0) kunye nokuphuma (1) ziingxelo zokutsiba ze-C++ ezenza ulawulo lutsibe ngaphandle kwenkqubo ngelixa inkqubo isenziwa. … Ukuphuma (0) kubonisa ukupheliswa ngempumelelo kwe Inkqubo kunye nokuphuma (1) kubonisa ukupheliswa okungaqhelekanga kwenkqubo.

Uthini umahluko phakathi kokuphuma nokuphuma ku-1?

Ukusilela kokuPhuma: Ukusilela kokuPhuma kuboniswa ngokuphuma (1) okuthetha ukupheliswa okungaqhelekanga kwenkqubo, okt. kukho impazamo okanye uphazamiseko lwenzekile.
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phuma (0) vs ukuphuma(1) ngeC/C++ ngeMizekeliso.

Kutheni ukuphuma u-0 kusetyenziswa kwiqokobhe?

Ezi zingasetyenziswa ngaphakathi kweskripthi seqokobhe ukutshintsha ukuhamba kophumezo ngokuxhomekeke kwi impumelelo okanye ukusilela kwemiyalelo eyenziweyo. … Impumelelo ngokwesiko imelwe ngokuphuma 0 ; ukusilela kuqhele ukuboniswa ngekhowudi yokuphuma engeyiyo-zero. Eli xabiso lingabonisa izizathu ezahlukeneyo zokusilela.