Potso e khafetsa: Ke hatisa joang mola oa ho qetela oa faele ho Unix?

Tse ka Hare

Specifying -r causes tail to print lines from the end of the file in reverse order. The default for -r is to print the entire file this way.

Ke hatisa mola oa ho qetela oa faele joang Linux?

Litsela tse 7 tse fapaneng tsa ho hatisa mohala oa ho qetela oa faele ho Linux

Mohatla ke taelo e sebelisoang ka ho fetisisa. …
Leibole ea END ka awk e etsa hore ho be bonolo le ho feta. …
Ho sed, $ e bontša mola oa ho qetela, 'me $p e re ho hatisa(p) mola oa ho qetela($) feela. …
Kgetho e nngwe ho sed ke ho hlakola(d) mela yohle ntle le(!) mola wa ho qetela($) eo le yona e hatisang mola wa ho qetela feela.

Ke hatisa joang mola oa ho qetela oa faele?

Fumana mola oa ho qetela oa faele:

Ho sebelisa sed (stream editor): sed -n '$p' fileName.
Ho sebelisa mohatla: mohatla -1 fileName.
sebelisa awk: awk 'END {print}' fileName.

21 tse ling. 2010 г.

Which command will print the last line of a file in Unix?

Mohatla ke taelo e hatisang palo e seng kae ea ho qetela ea mela (mela e 10 ka ho sa feleng) ea faele e itseng, ebe e felisa. Mohlala 1: "Mohatla" oa kamehla o hatisa mela e 10 ea ho qetela ea faele, ebe oa tsoa. Joalokaha u bona, sena se hatisa mela e 10 ea ho qetela ea /var/log/messages.

U fihla joang moleng oa ho qetela Unix?

Ka bokhutšoane tobetsa konopo ea Esc ebe u tobetsa Shift + G ho tsamaisa sesupa pheletsong ea faele ho vi kapa vim text editor tlasa Linux le Unix-like system.

Ke fumana mela e 'maloa ea pele ea faele joang ho Unix?

Ho sheba mela e 'maloa ea pele ea faele, thaepa hlooho filename, moo filename e leng lebitso la faele eo u batlang ho e sheba, ebe o tobetsa . Ka kamehla, hlooho e u bontša mela e 10 ea pele ea faele. U ka fetola sena ka ho thaepa hlooho -number filename, moo nomoro e leng palo ea mela eo u batlang ho e bona.

Ke bonts'a mola oa pele oa faele ho Linux joang?

Ngola taelo e latelang ea hlooho ho hlahisa mela e 10 ea pele ea faele e bitsoang "bar.txt":

hlooho -10 bar.txt.
hlooho -20 bar.txt.
sed -n 1,10p /etc/group.
sed -n 1,20p /etc/group.
awk 'FNR <= 10' /etc/passwd.
awk 'FNR <= 20' /etc/passwd.
perl -ne'1..10 le ho hatisa' /etc/passwd.
perl -ne'1..20 le ho hatisa' /etc/passwd.

18 mehla. 2018 г.

Ke grep joang mola oa ho qetela oa faele?

U ka nka sena e le mofuta oa tafole, moo kholomo ea pele e leng lebitso la faele 'me ea bobeli e le papali, moo karohano ea kholomo e leng ':' tlhaku. Fumana mola oa ho qetela oa faele ka 'ngoe (e nang le lebitso la faele). Ka nako eo, filthara dipholo tsa thehiloeng paterone. Mokhoa o mong ho sena o ka etsoa ka awk ho fapana le grep.

Re lokela ho ngola taelo ea katse joang ho theha faele?

Ho theha Lifaele

Ho theha faele e ncha, sebelisa taelo ea katse e lateloang ke opareitara ea redirection ( > ) le lebitso la faele eo u batlang ho e theha. Tobetsa Enter, thaepa mongolo 'me hang ha u qetile, tobetsa CRTL+D ho boloka faele.

Ke bonts'a mohala oa faele joang ho Unix?

awk : $>awk '{ha(NR==LINE_NUMBER) hatisa $0}' file.txt.
sed : $>sed -n LINE_NUMBERp file.txt.
hlooho : $>hlooho -n LINE_NUMBER file.txt | mohatla -n + LINE_NUMBER Mona LINE_NUMBER ke, nomoro ea mohala eo u batlang ho e hatisa ke efe. Mehlala: Hatisa mola ho tsoa faeleng e le 'ngoe.

26 сент. 2017 g.

U hlophisa mela e 10 ea pele joang?

hlooho -n10 filename | grep ... hlooho e tla hlahisa mela e 10 ea pele (ho sebelisa khetho ea -n), ebe o ka kenya phallo eo ho grep . U ka sebelisa mohala o latelang: hlooho -n 10 /path/to/file | grep […]

Ke kenya file joang ho Linux?

Mokhoa oa ho Sebelisa Tail Tail

Kenya taelo ea mohatla, e lateloe ke faele eo u ka ratang ho e sheba: mohatla /var/log/auth.log. …
Ho fetola palo ea mela e bontšitsoeng, sebelisa khetho ea -n: mohatla -n 50 /var/log/auth.log. …
Ho bonts'a nako ea 'nete, tlhahiso ea phallo ea faele e fetohang, sebelisa likhetho tsa -f kapa -follow: mohatla -f /var/log/auth.log.

10 le joalo. 2017 г.

Ke kopitsa faele joang ho Linux?

Linux Copy File Mehlala

Kopitsa faele bukeng e 'ngoe. Ho kopitsa faele ho tsoa bukeng ea hau ea hajoale ho ea bukeng e 'ngoe e bitsoang /tmp/, kenya: ...
Khetho ea Verbose. Ho bona lifaele ha li ntse li kopitsoa, fetisa khetho ea -v ka tsela e latelang ho taelo ea cp: ...
Boloka litšobotsi tsa faele. …
Ho kopitsa lifaele tsohle. …
Kopi e pheta-phetoang.

Lilemo tse 19. 2021 г.

Joang ho ea qetellong ea mola ho Linux?

Sebedisa dikgaoletso tse latelang ho suthisa cursor kapele moleng wa jwale ha o ntse o thaepa taelo.

Ctrl + A kapa Lehae: E-ea qalong ea mola.
Ctrl + E kapa Qetellong: E-ea qetellong ea mola.
Alt+B: E-ea ka ho le letšehali (morao) lentsoe le le leng.
Ctrl+B: Eya ka letsohong le letšehali (ka morao) tlhaku e le 'ngoe.
Alt+F: Tsamaea ka ho le letona (pele) lentsoe le le leng.

17 mets. 2017 г.

Mokhoa oa ho bala palo ea litlhaku le mela faeleng ke ofe?

Taelo "wc" ha e le hantle e bolela "palo ea mantsoe" 'me ka mekhahlelo e fapaneng ea boikhethelo motho a ka e sebelisa ho bala palo ea mela, mantsoe le litlhaku faeleng ea mongolo. Ho sebelisa wc ntle le likhetho ho tla u fumanela lipalo tsa li-byte, mela le mantsoe (-c, -l le -w kgetho).

Ke fumana mela e 50 ea ho qetela joang ho Linux?

Taelo ea mohatla e bonts'a, ka mokhoa o ikhethileng, mela e 10 ea ho qetela ea faele ea mongolo ho Linux. Taelo ena e ka ba molemo haholo ha u hlahloba tšebetso ea morao-rao lifaeleng tsa log. Setšoantšong se ka holimo u ka bona hore mela ea ho qetela ea 10 ea faele ea /var/log/messages e bontšitsoe. Khetho e 'ngoe eo u tla e fumana e sebetsa ke khetho ea -f.