1 imayimira kutulutsa kokhazikika (stdout). 2 imayimira cholakwika chokhazikika (stderr). Chifukwa chake 2> & 1 imati kutumiza cholakwika chokhazikika komwe kutulutsa kokhazikika kumayendetsedwanso.
Kodi tanthauzo la 2 >& 1 ndi chiyani?
"Mumagwiritsa ntchito &1 kunena za mtengo wofotokozera fayilo 1 (stdout). Chifukwa chake mukamagwiritsa ntchito 2>&1 mukunena kuti "Lozeraninso stderr kumalo omwewo tikuwongolera stdout". Ichi ndichifukwa chake titha kuchita chonga ichi kuti tiwongolere stdout ndi stderr kumalo omwewo: "
Kodi 2 >& 1 amatanthauza chiyani ndipo nthawi zambiri amagwiritsidwa ntchito liti?
&1 imagwiritsidwa ntchito kutanthauza mtengo wofotokozera fayilo 1 (stdout). Tsopano mpaka 2> & 1 imatanthauza "Kuwongolera stderr kumalo komweko komwe tikuwongolera stdout"
$$ mu Linux ndi chiyani?
$$ ndi ID ya ndondomeko (PID) ya script yokha. $BASHPID ndiye njira ID ya zomwe zikuchitika pano za Bash. Izi sizofanana ndi $$ variable, koma nthawi zambiri zimapereka zotsatira zomwezo. https://unix.stackexchange.com/questions/291570/what-is-in-bash/291577#291577. Gawani.
Kodi 2 imatanthauza chiyani mu Linux?
2 imatanthawuza fayilo yachiwiri yofotokozera ndondomekoyi, mwachitsanzo stderr . > kumatanthauza kupita kwina. &1 zikutanthauza kuti chandamale cholozeranso chiyenera kukhala malo omwewo monga momwe amafotokozera fayilo yoyamba, mwachitsanzo, stdout .
Kodi 1.5 zikutanthauza chimodzi ndi theka?
Mawu ophiphiritsa a Chingerezi akuti "theka limodzi" amatanthauza theka - mwachidule, 0.5 mumtengo. … Theka limodzi ndi theka, kapena 0.5 . Imodzi ndi theka ndi 1.5.
Kodi 1 amatanthauzanji mu meseji?
kusokoneza. "Bayi". Ndilankhula nanu nthawi ina.
Kodi ndimatsogolera bwanji stderr?
Zomwe zimatuluka nthawi zonse zimatumizidwa ku Standard Out (STDOUT) ndipo mauthenga olakwika amatumizidwa ku Standard Error (STDERR). Mukatumiza zotulutsa za console pogwiritsa ntchito > chizindikiro, mukungotumiza STDOUT. Kuti muwongolerenso STDERR, muyenera kutchula 2> chizindikiro cholozeranso.
Mumagwiritsa ntchito chiyani kutumiza zolakwika ku fayilo?
2 Mayankho
- Sinthani stdout ku fayilo imodzi ndikupita ku fayilo ina: lamulo> kunja 2> zolakwika.
- Lozeraninso stdout ku fayilo ( >out ), ndikulozeranso stderr ku stdout ( 2>&1 ): lamulo > out 2>&1.
$ ndi chiyani? Mu Bash?
$? ndikusintha kwapadera mu bash komwe nthawi zonse kumakhala ndi code yobwerera / yotuluka ya lamulo lomaliza lomwe laperekedwa. Mutha kuziwona mu terminal ndikuyendetsa echo $? . Ma code obwelera ali mgululi [0; 255]. Khodi yobwereza ya 0 nthawi zambiri imatanthauza kuti zonse zili bwino.
Kodi $1 pa Linux ndi chiyani?
$1 ndiye mtsutso woyamba wa mzere wolamula womwe umaperekedwa ku chipolopolo. … $0 ndilo dzina la script palokha (script.sh) $1 ndiye mtsutso woyamba (filename1) $2 ndiye mtsutso wachiwiri (dir1)
Kodi kugwiritsa ntchito Linux ndi chiyani?
The '!' chizindikiro kapena wogwiritsa ntchito mu Linux atha kugwiritsidwa ntchito ngati Logical Negation operator komanso kutenga malamulo kuchokera m'mbiri ndi ma tweaks kapena kuyendetsa lamulo loyendetsa kale ndikusintha.
Kodi ndingadziwe bwanji chipolopolo changa chapano?
Momwe mungayang'anire chipolopolo chomwe ndikugwiritsa ntchito: Gwiritsani ntchito malamulo otsatirawa a Linux kapena Unix: ps -p $$ - Onetsani dzina lanu lachipolopolo modalirika. echo "$SHELL" - Sindikizani chipolopolo cha omwe akugwiritsa ntchito koma osati chipolopolo chomwe chikuyenda.
$ ndi chiyani? Mu Unix?
$? -Kutuluka kwa lamulo lomaliza lomwe laperekedwa. $0 -Dzina lafayilo lazolemba zapano. $# -Chiwerengero cha zotsutsana zomwe zaperekedwa ku script. $$ -Nambala ya ndondomeko ya chipolopolo chamakono. Kwa zolemba za zipolopolo, iyi ndi ID ya ndondomeko yomwe akugwiritsira ntchito.
Kodi ndi lamulo liti lomwe limakulolani kuti muwone malamulo onse omwe mwagwiritsa ntchito?
Ku Linux, pali lamulo lothandiza kwambiri kuti ndikuwonetseni malamulo onse omaliza omwe agwiritsidwa ntchito posachedwa. Lamuloli limangotchedwa mbiri yakale, koma litha kupezekanso poyang'ana . bash_history mu foda yanu yakunyumba.
Kodi stdout imatanthauza chiyani?
Stdout, yomwe imadziwikanso kuti "standard output", ndiye kufotokozera kwa fayilo komwe ndondomeko imatha kulemba zotsatira. M'machitidwe opangira a Unix, monga Linux, macOS X, ndi BSD, stdout imatanthauzidwa ndi muyezo wa POSIX. Nambala yake yofotokozera mafayilo ndi 1. Mu terminal, zotuluka zokhazikika zimasintha pazenera la wogwiritsa ntchito.