I-Stderr, eyaziwa nangokuthi iphutha elijwayelekile, isichazi sefayela esizenzakalelayo lapho inqubo ingabhala imilayezo yephutha. Kuzinhlelo zokusebenza ezifana ne-Unix, njenge-Linux, i-macOS X, ne-BSD, i-stderr ichazwa yizinga le-POSIX. Inombolo yayo yesichazi sefayela ezenzakalelayo ithi 2. Kutheminali, iphutha elijwayelekile liyazenzakalela esikrinini somsebenzisi.
Isetshenziselwa ini i-stderr?
I-Stderr ingumlayezo wephutha ojwayelekile osetshenziselwa ukuphrinta okukhiphayo esikrinini noma kutheminali yeWindows. I-Stderr isetshenziselwa ukuphrinta iphutha kusikrini sokuphumayo noma ukuphela kwewindi. I-Stderr futhi ingenye yokukhishwa komyalo njenge-stdout, efakwe noma yikuphi ngokuzenzakalelayo.
Ithini incazelo ye-2 >&1?
“Usebenzisa i-&1 ukuze ubhekisele kwinani lesichazi sefayela 1 (stdout). Ngakho-ke uma usebenzisa i-2>&1 empeleni uthi “Qinisekisa kabusha i-stderr endaweni efanayo lapho siqondisa kabusha i-stdout”. Kungakho singenza into efana nale ukuqondisa kabusha kokubili i-stdout ne-stderr endaweni efanayo:
Ngingayithola kuphi i-stderr?
Kokubili okujwayelekile ( STDOUT ) nokukhishwayo kwephutha ( STDERR ) kuboniswa kutheminali yakho (yamanga). Ngokuvamile, i-STDOUT ne-STDERR zombili zingumkhiqizo oya kutheminali yakho.
Yini ukuqondisa kabusha kwe-stderr?
Isiphetho. Ukuqonda umqondo wokuqondisa kabusha nezichazi zefayela kubaluleke kakhulu lapho usebenza kulayini womyalo. Ukuze uqondise kabusha i-stderr ne-stdout , sebenzisa i-2>&1 noma &> yokwakha.
Ingabe i-stderr ifayela?
I-Stderr, eyaziwa nangokuthi iphutha elijwayelekile, isichazi sefayela esizenzakalelayo lapho inqubo ingabhala imilayezo yephutha. Kuzinhlelo zokusebenza ezifana ne-Unix, njenge-Linux, i-macOS X, ne-BSD, i-stderr ichazwa yizinga le-POSIX. Inombolo yayo yesichazi sefayela ezenzakalelayo ithi 2. Kutheminali, iphutha elijwayelekile liyazenzakalela esikrinini somsebenzisi.
Yini i-fprintf stderr?
fprintf(stderr,””); Iphrinta noma yini enikeziwe ngaphakathi kwezingcaphuno, kukhonsoli. Lapho, i-stdout ne-stderr kokubili ukusakazwa kokuphumayo. I-stdout ingumfudlana lapho uhlelo lubhala khona idatha yokuphumayo. I-stderr iwukusakaza okuphumayo okuvame ukusetshenziswa izinhlelo ukukhipha imilayezo yephutha noma ukuxilonga kukhonsoli.
Ngabe i-1.5 isho eyodwa nohhafu?
Ibinzana lesiNgisi elithi "ingxenye eyodwa" lisho uhhafu - ngamafuphi, inani elingu-0.5. … Ingxenye eyodwa inguhhafu, noma 0.5 . Ingxenye eyodwa nohhafu ingu-1.5.
Ithini incazelo ka-1 ngo-4?
Ingxenyana eyodwa-kwesine, ebhalwe ngezimpawu ezithi 1/4, isho “ucezu olulodwa, lapho kudingeka khona izingcezu ezine ukuze zenze yonke.” Ingxenyana ingxenye eyodwa kwezine, ebhalwe ngezimpawu ezithi 1/4, isho “ucezu olulodwa, lapho kudingeka khona izingcezu ezi-4 ukwenza yonke.”
Kusho ukuthini ukuthi 1 kumyalezo wombhalo?
ukunqamuka. "Hamba kahle". Ngizokhuluma nawe kamuva. 1.
Yini i-stderr ne-stdout ku-Unix?
Uma ukuqonda kwami kulungile, i-stdin yifayela lapho uhlelo lubhala khona ezicelweni zalo zokuqhuba umsebenzi enqubeni, i-stdout iyifayela lapho i-kernel ibhala khona okuphumayo kanye nenqubo eyicela ukuthi ifinyelele ulwazi kusuka, futhi i-stderr ifayela okufakwa kulo konke okuhlukile.
Iya kuphi i-fprintf stderr?
Njengoba uMark esechazile, i-printf iya ku-stdout ngenkathi i-fprintf yakho iya ku-stderr.
Iyini i-stdout ku-Unix?
I-Stdout, eyaziwa nangokuthi okukhiphayo okujwayelekile, iyisichazi sefayela esizenzakalelayo lapho inqubo ingabhala okuphumayo. Kuzinhlelo zokusebenza ezifana ne-Unix, njenge-Linux, i-macOS X, ne-BSD, i-stdout ichazwa yizinga le-POSIX. Inombolo yayo yesichazi sefayela ezenzakalelayo ithi 1. Kutheminali, okukhiphayo okujwayelekile kuyashintshashintsha esikrinini somsebenzisi.
Kusho ukuthini okungu-2 ku-Linux?
2 ibhekisela kusichazi sefayela sesibili senqubo, okungukuthi stderr . > kusho ukuqondisa kabusha. &1 isho ukuthi okuqondiwe kokuqondisa kabusha kufanele kube indawo efanayo nesichazi sefayela sokuqala, okungukuthi stdout .
Ngiyiqondisa kanjani kabusha i-stderr?
Okukhiphayo okuvamile kuthunyelwa ku-Standard Out (STDOUT) futhi imilayezo yephutha ithunyelwa Ephutha Elijwayelekile (STDERR). Uma uqondisa kabusha okukhiphayo kwekhonsoli usebenzisa > uphawu, uqondisa kabusha i-STDOUT kuphela. Ukuze uqondise kabusha i-STDERR, kufanele ucacise u-2> kuphawu lokuqondisa kabusha.
Yini oyisebenzisayo ukuze udlulisele amaphutha kufayela?
Izimpendulo ze-2
- Qondisa kabusha i-stdout kufayela elilodwa bese u-stderr uye kwelinye ifayela: umyalo> ukuphuma 2>iphutha.
- Qondisa kabusha i-stdout kufayela ( >out ), bese uqondisa kabusha i-stderr ku-stdout ( 2>&1 ): umyalo > ukuphuma 2>&1.