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 nyeem thawj 10 kab ntawm cov ntaub ntawv hauv Linux li cas?
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.
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.
Yuav ua li cas koj grep thawj 10 kab?
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 . Koj tuaj yeem siv cov kab hauv qab no: taub hau -n 10 /path/to/file | grep […]
Kuv yuav pom li cas 10 kab kawg ntawm cov ntaub ntawv hauv Linux?
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 paub kuv lub plhaub tam sim no li cas?
Yuav kuaj xyuas lub plhaub twg kuv siv: Siv cov lus txib hauv qab no Linux lossis Unix: ps -p $$ - Tso koj lub npe plhaub tam sim no kom ntseeg tau. ncha "$ SHELL" - Sau lub plhaub rau cov neeg siv tam sim no tab sis tsis tas lub plhaub uas khiav ntawm lub zog.
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.
Cov lus txib twg yog siv los txheeb xyuas cov ntaub ntawv?
Cov ntaub ntawv hais kom ua siv cov ntaub ntawv /etc/magic los txheeb xyuas cov ntaub ntawv uas muaj tus lej khawv koob; uas yog, tej ntaub ntawv uas muaj tus lej lossis cov hlua tsis tu ncua uas qhia txog hom. Qhov no qhia txog hom ntaub ntawv ntawm myfile (xws li cov npe, cov ntaub ntawv, ASCII ntawv, C qhov kev pab cuam, los yog archive).
Head command yog dab tsi?
Lub taub hau hais kom ua yog ib qho kev siv hluav taws xob rau kev tso tawm thawj feem ntawm cov ntaub ntawv muab rau nws ntawm tus qauv nkag. Nws sau cov txiaj ntsig mus rau cov qauv tsim tawm. Los ntawm lub neej ntawd lub taub hau rov qab thawj kaum kab ntawm txhua cov ntaub ntawv uas nws tau muab.
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.
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.
Kuv yuav qhia cov kab ntawv hauv Unix li cas?
lwm yam khoom
- awk : $>awk '{if(NR==LINE_NUMBER) print $0}' file.txt.
- sed : $>sed -n LINE_NUMBERp file.txt.
- head : $>head -n LINE_NUMBER file.txt | tail -n + LINE_NUMBER Ntawm no LINE_NUMBER yog, kab xov tooj twg koj xav luam tawm. Piv txwv: Sau ib kab los ntawm ib daim ntawv.
26 xee. Xyoo 2017.
Dab tsi yog txheej txheem los suav cov cim thiab kab hauv cov ntaub ntawv?
Cov lus txib "wc" feem ntau txhais tau tias "cov lus suav" thiab nrog cov kev xaiv sib txawv ib tus tuaj yeem siv nws los suav cov kab, cov lus, thiab cov cim hauv cov ntawv nyeem. Siv wc tsis muaj kev xaiv yuav ua rau koj suav ntawm bytes, kab, thiab cov lus (-c, -l thiab -w xaiv).
Koj tsim cov ntaub ntawv li cas hauv Linux?
- Tsim cov ntaub ntawv Linux tshiab los ntawm kab hais kom ua. Tsim cov ntaub ntawv nrog Kov Command. Tsim ib cov ntaub ntawv tshiab nrog tus neeg khiav dej num Redirect. Tsim Cov Ntaub Ntawv nrog Cat Command. Tsim cov ntaub ntawv nrog ncha hais kom ua. Tsim cov ntaub ntawv nrog printf Command.
- Siv Text Editors los tsim cov ntaub ntawv Linux. Vi Text Editor. Vim Text Editor. Nano Text Editor.
27 июн ib. Xyoo 2019.