Kev piav qhia. Cov lus txib fgrep tshawb nrhiav cov ntaub ntawv nkag tau teev tseg los ntawm Cov Ntaub Ntawv Parameter (tus qauv nkag los ntawm lub neej ntawd) rau cov kab uas phim tus qauv. Cov lus txib fgrep tshawb nrhiav tshwj xeeb rau Pattern tsis uas yog cov hlua ruaj. … Tus $,, [, |, (,), thiab / cim tau txhais lus los ntawm fgrep hais kom ua…
fgrep lo lus txib siv rau dab tsi?
Cov lus txib fgrep tshawb nrhiav cov ntaub ntawv nkag tau teev tseg los ntawm Cov Ntaub Ntawv Parameter (tus qauv nkag los ntawm lub neej ntawd) rau cov kab uas phim tus qauv. Cov lus txib fgrep tshawb nrhiav tshwj xeeb rau cov qauv tsis sib xws uas yog cov hlua ruaj khov.
fgrep yog dab tsi?
Cov lim fgrep yog siv los tshawb nrhiav cov kab cim ruaj khov hauv cov ntaub ntawv. Nws tuaj yeem muaj ntau yam ntaub ntawv los tshawb nrhiav. Cov lus txib no muaj txiaj ntsig zoo thaum koj xav tshawb nrhiav cov hlua uas muaj ntau cov lus qhia tsis tu ncua, xws li "^", "$", thiab lwm yam.
qhov txawv ntawm fgrep thiab grep yog dab tsi?
The grep lim nrhiav ib cov ntaub ntawv rau cov qauv tshwj xeeb ntawm cov cim thiab qhia txhua kab uas muaj cov qauv ntawd. Lub lim fgrep tshawb nrhiav cov kab cim ruaj khov hauv cov ntaub ntawv lossis cov ntaub ntawv.
Dab tsi yog qhov txawv ntawm grep thiab egrep cov lus txib?
Qhov sib txawv tseem ceeb ntawm grep thiab egrep yog grep yog ib qho lus txib uas tso cai rau kev tshawb nrhiav cov ntsiab lus raws li cov lus qhia tsis tu ncua thiab nthuav tawm cov kab sib txuamthaum egrep yog qhov txawv ntawm grepuas pab tshawb nrhiav cov ntsiab lus los ntawm kev siv cov kab lus txuas ntxiv los tso saib cov kab machining.
