Ukuze ubheke imigqa embalwa yokugcina yefayela, sebenzisa umyalo womsila. umsila usebenza ngendlela efanayo neyekhanda: thayipha umsila kanye negama lefayela ukuze ubone imigqa yokugcina eyi-10 yalelo fayela, noma thayipha igama lefayela elithi tail -number ukuze ubone imigqa yenombolo yokugcina yefayela. Zama ukusebenzisa umsila ukuze ubheke imigqa emihlanu yokugcina yakho.
Ngiyibona kanjani imigqa yokugcina eyi-10 yefayela ku-Unix?
I-syntax yomyalo we-Linux tail
Umsila umyalo ophrinta inombolo yokugcina embalwa yemigqa (imigqa eyi-10 ngokuzenzakalelayo) yefayela elithile, bese uyanqamula. Isibonelo sokuqala: Ngokuzenzakalelayo “umsila” uphrinta imigqa yokugcina eyi-1 yefayela, bese uyaphuma. njengoba ubona, lokhu kuphrinta imigqa engu-10 yokugcina / var / log / imilayezo.
Ngisibona kanjani isiphetho sefayela ku-Linux?
Umyalo womsila iyinsizakalo ye-Linux esetshenziselwa ukubuka ukuphela kwamafayela ombhalo. Ungasebenzisa futhi imodi yokulandela ukuze ubone imigqa emisha njengoba yengezwa kufayela ngesikhathi sangempela. umsila ufana nensizakalo yekhanda, esetshenziselwa ukubuka ukuqala kwamafayela.
Ngiyikhombisa kanjani imigqa yokuqala eyi-10 yefayela ku-Linux?
Ukubheka imigqa embalwa yokuqala yefayela, thayipha igama lefayela lekhanda, lapho igama lefayela kuyigama lefayela ofuna ukulibuka, bese ucindezela . Ngokuzenzakalelayo, ikhanda likukhombisa imigqa yokuqala eyi-10 yefayela. Ungakushintsha lokhu ngokuthayipha igama lefayela elithi head -number, lapho inombolo iyinombolo yemigqa ofuna ukuyibona.
Ngiwubonisa kanjani umugqa wefayela ku-Unix?
Bhala i-bash script ukuze uphrinte umugqa othile efayeleni
- awk : $>awk '{if(NR==LINE_NUMBER) phrinta $0}' file.txt.
- sed : $>sed -n LINE_NUMBERp file.txt.
- ikhanda : $>head -n LINE_NUMBER file.txt | umsila -n + LINE_NUMBER Nansi i-LINE_NUMBER, iyiphi inombolo yomugqa ofuna ukuyiphrinta. Izibonelo: Phrinta umugqa kusuka efayeleni elilodwa.
Ngiwubonisa kanjani umugqa we-10 wefayela?
Ngezansi kunezindlela ezintathu ezinhle zokuthola umugqa we-nth wefayela ku-Linux.
- ikhanda / umsila. Ukusebenzisa nje inhlanganisela yemiyalo yekhanda nomsila cishe kuyindlela elula kakhulu. …
- sed. Kunezindlela ezimbalwa ezinhle zokwenza lokhu nge-sed. …
- awu. I-awk ine-NR eyakhelwe ngaphakathi egcina umkhondo wezinombolo zemigqa yefayela/yokusakaza.
Ngiwenza kanjani uhlu lwamafayela ayi-10 okuqala ku-Linux?
The Umyalo we-ls ngisho unezinketho zalokho. Ukufaka ohlwini amafayela emigqeni embalwa ngangokunokwenzeka, ungasebenzisa -format=comma ukuze uhlukanise amagama amafayela ngokhefana njengakulo myalo: $ ls -format=comma 1, 10, 11, 12, 124, 13, 14, 15, 16pgs-indawo.
Iyiphi inqubo yokubala inani lezinhlamvu nemigqa efayeleni?
Umyalo we-wc imele “isibalo samagama” futhi ine-syntax elula. Ikuvumela ukubala inani lemigqa, amagama, amabhayithi, nezinhlamvu kufayela lombhalo elilodwa noma amaningi.
Yini #! Ku-Unix?
Kukhompyutha, i-shebang ukulandelana kwezinhlamvu okuhlanganisa uphawu lwenombolo yezinhlamvu kanye nophawu lwesibabazo ( #!) ekuqaleni kombhalo. … Ibuye ibizwe ngokuthi sha-bang (okucatshangwa ukuthi ayizwanga kahle noma ayididwa umbhali encwadini yakhe yakamuva, iposi lika-2010), i-hashbang, i-pound-bang, noma i-hash-pling.
Iyini inhloso ku-Unix?
I-Unix iyisistimu yokusebenza. It isekela ukwenza izinto eziningi nokusebenza kwabasebenzisi abaningi. I-Unix isetshenziswa kakhulu kuzo zonke izinhlobo zezinhlelo zekhompiyutha ezifana nedeskithophu, ilaptop, namaseva. Ku-Unix, kune-Graphical interface yomsebenzisi efana namawindi asekela ukuzulazula okulula nendawo esekelayo.
Ngilifaka kanjani umsila wefayela ku-Linux?
Ungayisebenzisa Kanjani I-Tail Command
- Faka umyalo womsila, ulandelwe yifayela ongathanda ukulibuka: umsila /var/log/auth.log. …
- Ukuze ushintshe inombolo yemigqa ebonisiwe, sebenzisa inketho ethi -n: tail -n 50 /var/log/auth.log. …
- Ukuze ubonise isikhathi sangempela, ukusakaza okukhiphayo kwefayela elishintshayo, sebenzisa izinketho zokuthi -f noma -follow: tail -f /var/log/auth.log.
Usithola kanjani isiphetho sefayela?
Ungakwenza noma sebenzisa into ye-ifstream ethi 'fin' ebuyisela u-0 ekugcineni kwefayela noma ungasebenzisa i-eof() okuwumsebenzi welungu wekilasi le-ios. Ibuyisela inani elingelona uziro ekufinyeleleni ekugcineni kwefayela.
Ngiwubuka kanjani umyalo ku-Linux?
kusetshenziswa umyalo wokubuka ku-Linux ukwenza uhlelo ngezikhathi ezithile, ebonisa okukhiphayo kusikrini esigcwele. Lo myalo uzosebenzisa umyalo oshiwo ku-agumenti ngokuphindaphindiwe ngokubonisa okukhiphayo namaphutha. Ngokuzenzakalelayo, umyalo oshiwo uzosebenza njalo kumasekhondi angu-2 futhi iwashi lizosebenza lize liphazamiseke.