Txhawm rau saib thawj ob peb kab ntawm cov ntaub ntawv, ntaus lub taub hau filename, qhov twg filename yog lub npe ntawm cov ntaub ntawv koj xav saib, thiab tom qab ntawd nias
Kuv yuav ua li cas qhia thawj 10 kab ntawm cov ntaub ntawv hauv Linux?
Ntaus lub taub hau hauv qab no kom pom thawj 10 kab ntawm cov ntaub ntawv hu ua "bar.txt":
- taub hau -10 bar.txt.
- taub hau -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 and print' /etc/passwd.
- perl -ne'1..20 and print' /etc/passwd.
18 xee. Xyoo 2018.
Yuav ua li cas koj grep thawj 10 kab?
Koj muaj ob peb txoj kev xaiv siv cov kev pab cuam nrog rau grep . Qhov yooj yim tshaj plaws hauv kuv lub tswv yim yog siv lub taub hau : taub hau -n10 filename | grep ... lub taub hau yuav tso tawm thawj 10 kab (siv qhov kev xaiv -n), thiab tom qab ntawd koj tuaj yeem tso cov yeeb nkab tso tawm rau grep .
Cov lus txib twg yog siv los tso saib thawj 10 kab ntawm qhov pib ntawm cov ntaub ntawv?
Lub taub hau hais kom ua, raws li lub npe implies, luam tawm sab saum toj N tus naj npawb ntawm cov ntaub ntawv ntawm kev muab tswv yim. Los ntawm lub neej ntawd, nws luam thawj 10 kab ntawm cov ntaub ntawv teev tseg. Yog tias muaj ntau tshaj ib lub npe cov ntaub ntawv, cov ntaub ntawv los ntawm txhua cov ntaub ntawv yog ua ntej los ntawm nws cov ntaub ntawv npe.
Kuv yuav saib cov kab ntawv hauv Linux li cas?
Grep yog Linux / Unix command-line cuab yeej siv los tshawb nrhiav cov hlua ntawm cov cim hauv cov ntaub ntawv teev tseg. Cov ntawv tshawb nrhiav qauv hu ua ib qho kev qhia tsis tu ncua. Thaum nws pom qhov sib tw, nws luam cov kab nrog qhov tshwm sim. Cov lus txib grep yog ib qho yooj yim thaum tshawb nrhiav los ntawm cov ntaub ntawv log loj.
Kuv yuav pom 10 kab kawg ntawm cov ntaub ntawv hauv Unix li cas?
Linux tail command syntax
Tail yog ib qho lus txib uas luam tawm ob peb kab kawg (10 kab los ntawm lub neej ntawd) ntawm qee cov ntaub ntawv, ces xaus. Piv txwv 1: Los ntawm lub neej ntawd "tail" luam tawm 10 kab kawg ntawm cov ntaub ntawv, ces tawm. raws li koj tuaj yeem pom, qhov no luam tawm 10 kab kawg ntawm /var/log/messages.
Kuv yuav luam thawj 10 cov ntaub ntawv hauv UNIX li cas?
Luam thawj n cov ntaub ntawv los ntawm ib phau ntawv mus rau lwm qhov
- nrhiav. – maxdepth 1 -type f | taub hau -5 | xargs cp -t /target/directory. Qhov no zoo li pheej hmoo, tab sis ua tsis tiav vim hais tias osx cp tsis tshwm sim kom muaj. -t hloov.
- exec nyob rau hauv ob peb txawv configurations. Qhov no tej zaum ua tsis tiav rau cov teeb meem syntax ntawm kuv kawg : / Kuv tsis tuaj yeem zoo li tau txais lub taub hau xaiv ua haujlwm.
13 xee. Xyoo 2018.
Koj grep ob peb kab li cas?
Rau BSD lossis GNU grep koj tuaj yeem siv -B tus lej los teeb tsa pes tsawg kab ua ntej kev sib tw thiab -A tus lej rau tus lej ntawm kab tom qab kev sib tw. Yog tias koj xav tau tib cov kab ua ntej thiab tom qab koj tuaj yeem siv -C num . Qhov no yuav qhia 3 kab ua ntej thiab 3 kab tom qab.
Tus miv hais kom ua dab tsi?
'miv' [luv luv rau "concatenate"] cov lus txib yog ib qho ntawm cov lus txib uas nquag siv hauv Linux thiab lwm lub tshuab ua haujlwm. Cov lus txib miv tso cai rau peb los tsim ib lossis ntau cov ntaub ntawv, saib muaj cov ntaub ntawv, sib txuas cov ntaub ntawv thiab redirect tso zis hauv davhlau ya nyob twg lossis cov ntaub ntawv.
grep command ua dab tsi?
grep yog ib qho khoom siv hluav taws xob rau kev tshawb nrhiav cov ntaub ntawv dawb-ntawv teev rau cov kab uas phim cov lus qhia tsis tu ncua. Nws lub npe los ntawm ed hais kom ua g/re/p (hloov mus nrhiav cov lus qhia tsis tu ncua thiab luam cov kab sib txuam), uas muaj cov txiaj ntsig zoo ib yam.
Cov lus txib twg yog siv los txheeb xyuas cov ntaub ntawv?
Yog tag nrho! cov ntaub ntawv hais kom ua yog ib qho txiaj ntsig Linux siv los txiav txim siab hom ntaub ntawv yam tsis muaj qhov txuas ntxiv.
Koj siv head commands li cas?
Yuav Siv Lub Taub Hau Hais kom ua li cas
- Nkag mus rau lub taub hau hais kom ua, ua raws li cov ntaub ntawv uas koj xav pom: taub hau /var/log/auth.log. …
- Txhawm rau hloov cov kab uas tshwm sim, siv qhov kev xaiv -n: taub hau -n 50 /var/log/auth.log. …
- Txhawm rau qhia qhov pib ntawm cov ntaub ntawv mus txog ib tus lej ntawm bytes, koj tuaj yeem siv qhov kev xaiv -c: taub hau -c 1000 /var/log/auth.log.
10 ua. Xyoo 2017.
Kuv yuav saib cov folders li cas?
Yuav Ua Li Cas Sau Cov Ntawv Teev Npe nkaus xwb hauv Linux
- Sau cov npe siv Wildcards. Txoj kev yooj yim tshaj plaws yog siv wildcards. …
- Siv -F xaiv thiab grep. Cov kev xaiv -F ntxiv ib qho kev sib tw rau pem hauv ntej. …
- Siv -l kev xaiv thiab grep. Hauv cov npe ntev ntawm ls xws li ls -l, peb tuaj yeem 'grep' cov kab pib nrog d . …
- Siv echo hais kom ua. …
- Siv printf. …
- Siv cov lus txib nrhiav.
2 ygo. Xyoo 2012.
Kuv yuav nrhiav tau li cas ntawm Linux?
nrhiav yog ib qho lus txib rau recursively filtering khoom nyob rau hauv cov ntaub ntawv system raws li ib tug yooj yim conditional mechanism. Siv nrhiav los tshawb nrhiav cov ntaub ntawv lossis cov npe ntawm koj cov ntaub ntawv kaw lus. Siv tus chij -exec, cov ntaub ntawv tuaj yeem pom thiab ua tiav tam sim hauv tib cov lus txib.
Kuv yuav nrhiav tau lub npe filename hauv Linux li cas?
Piv txwv
- nrhiav. - npe thisfile.txt. Yog tias koj xav paub yuav ua li cas nrhiav cov ntaub ntawv hauv Linux hu ua thisfile. …
- nrhiav /home -name *.jpg. Saib tag nrho. jpg cov ntaub ntawv hauv / tsev thiab cov npe hauv qab nws.
- nrhiav. - hom f -empty. Nrhiav ib cov ntaub ntawv khoob hauv daim ntawv teev npe tam sim no.
- nrhiav /home -user randomperson-mtime 6 -iname “.db”
25 xee. Xyoo 2019.
Kuv yuav nrhiav tau ib daim nplaub tshev hauv Linux li cas?
Koj yuav tsum siv nrhiav cov lus txib. Nws yog siv los nrhiav cov ntaub ntawv ntawm Linux lossis Unix-zoo li system. Qhov chaw hais kom ua yuav tshawb los ntawm cov ntaub ntawv prebuilt ntawm cov ntaub ntawv tsim los ntawm updatedb. Cov lus txib nrhiav yuav tshawb cov ntaub ntawv nyob-system rau cov ntaub ntawv uas phim cov txheej txheem tshawb nrhiav.