Ulithola kanjani igama lokugcina emgqeni wefayela le-UNIX?

Uwubonisa kanjani umugqa wokugcina wefayela lombhalo ku-Unix?

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.

Ngiwukhipha kanjani umugqa othize efayeleni eliku-Unix?

Ukuze ukhiphe uhla lwemigqa, isho ulayini 2 kuye ku-4, ungenza noma yikuphi kokulandelayo:

1. $ sed -n 2,4p somefile. txt.
2. $ sed '2,4! d'ifayela. txt.

Ulifaka kanjani igama kusuka kumugqa ku-Linux?

Sebenzisa -B kanye nenani lemigqa ukuze ubonise ngaphambi komdlalo: i-grep -B 2 isampula ye-phoenix - lo myalo uphrinta imigqa emibili ngaphambi komdlalo. Sebenzisa -C kanye nenani lemigqa ukuze ubonise ngaphambi nangemuva komdlalo: grep -C 2 isampula yephoenix - lo myalo uphrinta imigqa emibili ngaphambi nangemuva komdlalo.

Uwuthola kanjani umugqa wokugcina nowokuqala ku-Unix?

sed -n '1p;$p' ifayela. I-txt izophrinta eyoku-1 kanye nomugqa wokugcina wefayela. txt. Ngemva kwalokhu, uzoba ne-ary ary enenkambu yokuqala (okungukuthi, enenkomba 0 ) ewumugqa wokuqala wefayela , futhi inkambu yawo yokugcina ibe umugqa wokugcina wefayela .

Ngiyibonisa kanjani imigqa embalwa yokuqala yefayela ku-Unix?

Thayipha umyalo wekhanda olandelayo ukuze ubonise imigqa yokuqala eyi-10 yefayela elibizwa ngokuthi “bar.txt”:

1. ikhanda -10 bar.txt.
2. ikhanda -20 bar.txt.
3. sed -n 1,10p /etc/group.
4. sed -n 1,20p /etc/group.
5. awk 'FNR <= 10' /etc/passwd.
6. awk 'FNR <= 20' /etc/passwd.
7. perl -ne'1..10 bese uphrinta' /etc/passwd.
8. perl -ne'1..20 bese uphrinta' /etc/passwd.

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.

Ngingena kanjani emgqeni wefayela ku-Linux?

Bhala i-bash script ukuze uphrinte umugqa othile efayeleni

1. awk : $>awk '{if(NR==LINE_NUMBER) phrinta $0}' file.txt.
2. sed : $>sed -n LINE_NUMBERp file.txt.
3. 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.

Iyini i-NR kumyalo we-awk?

I-NR iyi-variable eyakhelwe ngaphakathi ye-AWK futhi yona isho inombolo yamarekhodi asetshenzwayo. Ukusetshenziswa : I-NR ingasetshenziswa kubhulokhi yesenzo imele inombolo yomugqa ocutshungulwayo futhi uma isetshenziswa kokuthi END ingaphrinta inombolo yemigqa ecutshungulwe ngokuphelele. Isibonelo : Ukusebenzisa i-NR ukuphrinta inombolo yomugqa kufayela usebenzisa i-AWK.

Ngilifaka kanjani ifayela ku-Linux?

Ungawusebenzisa kanjani umyalo we-grep ku-Linux

1. I-Grep Command Syntax: grep [izinketho] PATTERN [IFILE...] ...
2. Izibonelo zokusebenzisa i-'grep'
3. grep foo /file/name. …
4. grep -i "foo" /file/name. …
5. grep 'iphutha 123' /file/name. …
6. grep -r “192.168.1.5” /etc/ …
7. grep -w “foo” /file/name. …
8. egrep -w 'word1|word2' /file/name.

Ulihlanganisa kanjani igama elilodwa emgqeni?

I-syntax yile:

1. Sebenzisa izingcaphuno ezilodwa kuphethini: grep 'pattern*' file1 file2.
2. Sebenzisa okulandelayo izinkulumo ezivamile ezinwetshiwe: egrep 'pattern1|pattern2' *. py.
3. Ekugcineni, zama kumagobolondo/ama-ose amadala e-Unix: grep -e pattern1 -e pattern2 *. pl.
4. Enye inketho yokufaka izintambo ezimbili: grep 'word1|word2' input.

Ngiyithola kanjani imigqa ehlukile ku-Linux?

Ukuze uthole izenzakalo eziyingqayizivele lapho imigqa ingasondelene nefayela kudingeka libe khona ihlungwe ngaphambi kokudlulela ku-uniq . i-uniq izosebenza njengoba kulindelekile kufayela elilandelayo eliqanjwe ababhali. txt. Njengoba izimpinda ziseduze i-uniq izobuyisela izehlakalo eziyingqayizivele futhi ithumele umphumela ekuphumeni okujwayelekile.

Ngilihlanganisa kanjani igama elilodwa efayeleni?

Isesha Amaphethini Nge-grep

1. Ukusesha iyunithi yezinhlamvu ethile efayeleni, sebenzisa umyalo we-grep. …
2. I-grep iyazwela; okungukuthi, kufanele uqondanise iphethini ngokuphathelene nosonhlamvukazi abakhulu nabancane:
3. Qaphela ukuthi i-grep yehlulekile kumzamo wokuqala ngoba akukho nokukodwa kokufakiwe okuqale ngofeleba abancane a.

Uyini umyalo we-awk Unix?

Awk ulimi lokubhala olusetshenziselwa ukukhohlisa idatha kanye nokukhiqiza imibiko. Ulimi lokuhlela lomyalo we-awk aludingi ukuhlanganiswa, futhi luvumela umsebenzisi ukuthi asebenzise okuguquguqukayo, imisebenzi yezinombolo, imisebenzi yezintambo, nama-opharetha anengqondo. … I-Awk isetshenziselwa kakhulu ukuskena iphethini nokucubungula.

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.

Uthini umyalo wokulanda amarekhodi ayi-10 okuqala ngefayela?

Umyalo wekhanda, njengoba igama lisho, phrinta inombolo ephezulu engu-N yedatha yokokufaka okunikeziwe. Ngokuzenzakalelayo, iphrinta imigqa yokuqala eyi-10 yamafayela ashiwo. Uma kunikezwe igama lefayela elingaphezu kwelilodwa khona-ke idatha evela kufayela ngalinye yandulelwa igama lefayela layo.