Yuav ua li cas kuv grep ntau qhov tseem ceeb hauv ib cov ntaub ntawv?
Qhov yooj yim grep syntax thaum tshawb nrhiav ntau tus qauv hauv cov ntaub ntawv suav nrog kev siv cov lus txib grep ua raws los ntawm cov hlua thiab lub npe ntawm cov ntaub ntawv lossis nws txoj hauv kev. Cov qauv yuav tsum tau muab kaw nrog ib qho kev hais lus thiab sib cais los ntawm cov yeeb nkab cim. Siv lub backslash ua ntej yeeb nkab | rau cov lus qhia tsis tu ncua.
Koj ntxiv ob grep lus txib li cas?
Muaj ob txoj hauv kev:
- Pab pawg lawv: { grep 'substring1' file1.txt grep 'substring2' file2.txt } > outfile.txt. …
- Siv lub appending redirection neeg teb xov tooj >> rau qhov thib ob redirection: grep 'substring1' file1.txt > outfile.txt grep 'substring2' file2.txt >> outfile.txt.
Koj siv txuas ntxiv grep li cas?
Grep Regular Expression
Hauv nws daim ntawv yooj yim tshaj plaws, thaum tsis muaj hom kev qhia tsis tu ncua, grep txhais cov qauv tshawb nrhiav raws li cov lus qhia tsis tu ncua. Txhawm rau txhais cov qauv ua ib qho kev nthuav dav ntxiv, siv qhov -E (lossis -extended-regexp) kev xaiv.
Kuv yuav muab grep thiab nrhiav tau li cas?
Ua ke nrhiav thiab grep
- Peb pib nrog 'nrhiav' hais kom ua nws tus kheej.
- Cov '. …
- Kuv siv qhov "-type f" sib cav los qhia cov lus txib nrhiav kom tsuas yog saib cov ntaub ntawv. …
- Cov lus txib nrhiav 'exec' sib cav tso cai rau koj ua tiav cov lus txib, hauv qhov no cov lus txib grep.
- Qhov "grep 'needle'" ib feem ntawm cov lus txib zoo li ib txwm grep hais kom ua.
Yuav ua li cas kuv grep ntau lo lus nyob rau hauv ib kab?
Yuav ua li cas kuv grep rau ntau tus qauv?
- Siv ib qho lus hais hauv tus qauv: grep 'pattern *' file1 file2.
- Tom ntej no siv txuas cov kab lus tsis tu ncua: egreg 'pattern1|pattern2' * . py.
- Thaum kawg, sim cov laus Unix plhaub/oses: grep -e pattern1 -e pattern2 *. pl.
- Lwm qhov kev xaiv rau grep ob txoj hlua: grep 'word1|word2' input.
Yuav ua li cas kuv grep ntau folders?
Txhawm rau suav tag nrho cov subdirectories hauv kev tshawb nrhiav, ntxiv tus neeg teb xov tooj -r rau grep hais kom ua. Cov lus txib no luam tawm qhov sib tw rau txhua cov ntaub ntawv hauv cov npe tam sim no, subdirectories, thiab txoj hauv kev nrog lub npe file.
Koj grep cov cim tshwj xeeb li cas?
Kom phim tus cwj pwm uas tshwj xeeb rau grep -E, muab ib tug backslash ( ) nyob rau hauv pem hauv ntej ntawm tus cwj pwm. Nws yog feem ntau yooj yim dua los siv grep –F thaum koj tsis xav tau cov qauv tshwj xeeb txuam.
Yuav ua li cas kuv grep nyob rau hauv ib tug folder?
GREP: Ntiaj teb no Regular Expression Print/Paser/Processor/Program. Koj tuaj yeem siv qhov no los tshawb nrhiav cov npe tam sim no. Koj tuaj yeem hais qhia -R rau "recursive", uas txhais tau hais tias qhov kev pabcuam tshawb nrhiav hauv txhua lub subfolders, thiab lawv cov subfolders, thiab lawv cov subfolder subfolders, thiab lwm yam. grep -R "koj lo lus".
Kuv yuav grep cov ntaub ntawv hauv Linux li cas?
Yuav ua li cas siv grep hais kom ua hauv Linux
- Grep hais kom ua Syntax: grep [xaiv] Qauv [FILE…] …
- Piv txwv ntawm kev siv 'grep'
- grep foo /file/name. …
- grep -i "foo" /file/name. …
- grep ' yuam kev 123' /file/name. …
- grep -r “192.168.1.5” /etc/ …
- grep -w "foo" /file/name. …
- egrep -w 'word1|word2' /file/name.
Dab tsi yog txuas ntxiv kev nthuav qhia hauv Unix?
POSIX Extended Regular Expressions
Kev nthuav qhia tsis tu ncua lossis ERE tsw standardizes ib tug tsw zoo ib yam li ib tug siv los ntawm UNIX egrep hais kom ua. "Extended" yog txheeb ze rau thawj UNIX grep, uas tsuas muaj cov kab lus qhia, dot, caret, duas thiab hnub qub. Ib qho ERE txhawb cov no ib yam li BRE.
Cov lus txib twg luam tawm tag nrho cov kab nrog ob lub cim hauv UNIX?
Grep tshawb cov npe nkag FILEs (lossis cov qauv nkag yog tias tsis muaj cov ntaub ntawv muaj npe, lossis cov npe cov ntaub ntawv - tau muab) rau cov kab uas muaj qhov sib tw rau tus qauv muab. Los ntawm lub neej ntawd, grep luam tawm cov kab sib txuam. Tsis tas li ntawd, muaj ob txoj haujlwm sib txawv egreg thiab fgrep.
Kuv siv nrhiav hauv Linux li cas?
Cov lus txib nrhiav yog siv los tshawb nrhiav thiab nrhiav cov npe ntawm cov ntaub ntawv thiab cov npe raws li cov xwm txheej uas koj tau teev tseg rau cov ntaub ntawv uas phim cov lus sib cav. nrhiav cov lus txib tuaj yeem siv ntau yam xws li koj tuaj yeem nrhiav cov ntaub ntawv los ntawm kev tso cai, cov neeg siv, pawg, hom ntaub ntawv, hnub tim, qhov loj me, thiab lwm yam ua tau.
grep exec ua dab tsi?
Nrhiav exec ua rau pom cov lus txib kom ua tiav cov haujlwm muab ib zaug ib daim ntawv sib tw. Nws yuav tso lub npe ntawm cov ntaub ntawv nyob qhov twg peb muab lub {} placeholder. Nws yog siv los ua ke nrog lwm cov lus txib kom ua tiav qee yam haujlwm. Piv txwv li: nrhiav exec grep tuaj yeem luam tawm cov ntaub ntawv nrog qee cov ntsiab lus.
Kuv yuav luam grep filename li cas?
Xaus – Grep los ntawm cov ntaub ntawv thiab tso saib cov ntaub ntawv npe
grep -n 'string' filename: quab yuam grep ntxiv ua ntej txhua kab ntawm cov zis nrog cov kab zauv hauv nws cov ntaub ntawv nkag. grep –with-filename 'word' file LOSSIS grep -H 'bar' file1 file2 file3 : Sau cov ntaub ntawv npe rau txhua qhov sib tw.