Kuv yuav nrhiav tau thawj 100 kab 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.
Kuv yuav ua li cas qhia thawj 10 kab ntawm cov ntaub ntawv hauv Linux?
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 . Los ntawm lub neej ntawd, lub taub hau qhia koj thawj 10 kab ntawm cov ntaub ntawv. Koj tuaj yeem hloov qhov no los ntawm kev ntaus lub taub hau -number filename, qhov twg tus lej yog tus lej ntawm kab koj xav pom.
Kuv yuav ua li cas grep thawj kab ntawm cov ntaub ntawv hauv Linux?
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 […]
Koj pom kab hauv cov ntaub ntawv li cas hauv Linux?
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 ua li cas qhia cov kab hauv ib cov ntaub ntawv hauv Unix?
Yuav suav cov kab hauv cov ntaub ntawv li cas hauv UNIX/Linux
- Cov lus txib "wc -l" thaum khiav ntawm cov ntaub ntawv no, tso tawm cov kab suav nrog rau lub npe file. $ wc -l file01.txt 5 file01.txt.
- Txhawm rau tshem tawm cov npe ntawm qhov tshwm sim, siv: $ wc -l < file01.txt 5.
- Koj tuaj yeem muab cov lus txib tso tawm rau wc hais kom ua siv yeeb nkab. Piv txwv li:
Kuv yuav luam 10 kab kawg hauv Linux li cas?
1. suav cov kab hauv cov ntaub ntawv, siv 'cat f. txt | wc -l` thiab tom qab ntawd siv lub taub hau thiab tus Tsov tus tw hauv lub raj xa dej los luam tawm 81424 kab kawg ntawm cov ntaub ntawv (kab #totallines-81424-1 rau #totallines).
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 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.
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.
Kuv yuav ua li cas grep tom ntej no 10 kab?
Koj tuaj yeem siv -B thiab -A los luam cov kab ua ntej thiab tom qab kev sib tw. Yuav luam 10 kab ua ntej qhov kev sib tw, suav nrog cov kab sib txuam nws tus kheej. Thiab yog tias koj xav tau luam tawm 10 kab ntawm cov thawj coj thiab cov ntsiab lus tso tawm tom qab. -A num –after-context=num Sau cov kab ntawm cov ntsiab lus trailing tom qab txuam kab.
Dab tsi yog kev siv awk hauv Linux?
Awk yog ib qho khoom siv uas ua rau tus programmer sau me me tab sis cov kev pab cuam zoo nyob rau hauv daim ntawv ntawm cov nqe lus uas txhais cov qauv ntawv uas yuav tsum tau tshawb nrhiav nyob rau hauv txhua kab ntawm cov ntaub ntawv thiab qhov yuav tsum tau ua thaum muaj kev sib tw hauv ib qho kab. Awk feem ntau yog siv rau cov qauv scanning thiab ua.
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.
Yuav ua li cas kuv grep ib kab hauv ib cov ntaub ntawv?
Cov lus txib grep tshawb nrhiav los ntawm cov ntaub ntawv, nrhiav kev sib tw rau cov qauv teev tseg. Txhawm rau siv nws ntaus grep, ces tus qauv peb tab tom nrhiav thiab thaum kawg lub npe ntawm cov ntaub ntawv (lossis cov ntaub ntawv) peb tab tom nrhiav hauv. Cov zis yog peb kab hauv cov ntaub ntawv uas muaj cov ntawv 'tsis'.
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.
Kuv yuav tshawb nrhiav cov ntawv hauv txhua cov ntaub ntawv hauv Linux li cas?
Txhawm rau nrhiav cov ntaub ntawv uas muaj cov ntawv tshwj xeeb hauv Linux, ua cov hauv qab no.
- Qhib koj lub davhlau ya nyob twg app nyiam. XFCE4 davhlau ya nyob twg yog kuv tus kheej nyiam.
- Coj mus rhaub (yog tias xav tau) mus rau lub nplaub tshev uas koj yuav mus tshawb cov ntaub ntawv nrog qee cov ntawv tshwj xeeb.
- Ntaus cov lus txib nram qab no: grep -iRl "koj-ntawv nyeem-los-nrhiav"./
4 xee. Xyoo 2017.