Cov txheej txheem:
Video: Lastlog file hauv Linux yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lastlog yog ib qhov kev pab cuam muaj nyob rau hauv feem ntau Linux kev faib tawm. Nws tawm tswv yim thiab luam tawm cov ntsiab lus ntawm lub xeem nkag nkag ntaub ntawv , /var/log/ Lastlog (uas yog feem ntau yog sparse heev ntaub ntawv ), suav nrog lub npe nkag, chaw nres nkoj, thiab hnub tim thiab lub sijhawm kawg.
Ib yam li ntawd, tib neeg nug, vim li cas Lastlog yog cov ntaub ntawv tsis sib xws?
Cov Lastlog file yog tsim los ua ib sparse ntaub ntawv , yog li tsuas yog chunks ntawm lub ntaub ntawv uas yog siv tiag tiag siv lub cev cia chaw. Yog li txhua qhov chaw tiag tiag tsis faib. Cov ntaub ntawv me me xwb qhia koj tias yuav loj npaum li cas yog tias koj sim luam los yog koj yeej muaj 232 cov neeg siv.
Tsis tas li ntawd, Tallylog yog dab tsi? man pam_tally2: tallylog yog ib lub cav ntawm (ua tsis tiav) kev nkag mus thiab lub pam_tally2 mechanism tswj kev suav ntawm kev sim nkag, tuaj yeem rov pib suav rau kev ua tiav, thiab tuaj yeem tsis lees paub yog tias muaj ntau qhov kev sim ua tsis tiav.
Ntxiv mus, kuv yuav rho tawm Lastlog li cas?
Linux tshem tawm lossis tshem tawm cov ntaub ntawv nkag mus kawg
- lus txib. Cov lus txib lastlog qhia txog kev nkag mus tsis ntev los no ntawm txhua tus neeg siv lossis ntawm tus neeg siv muab.
- Task: Muab cov ntaub ntawv nkag mus zaum kawg. Tsuas ntaus cov lus txib lastlog:
- Task: Tshem tawm cov ntaub ntawv nkag mus dhau los ntawm kev rho tawm /var/log/lastlog. Tsuas yog overwrite /var/log/lastlog cov ntaub ntawv.
- xeem thiab lastb commands.
Wtmp yog dab tsi hauv Linux?
Wtmp yog ib daim ntawv ntawm lub Linux , Solaris, thiab BSD operating systems uas khaws keeb kwm ntawm txhua qhov kev nkag thiab tawm. Ntawm Linux systems, nws nyob ntawm /var/log/ wtmp ua . Ntau cov lus txib nkag wtmp ua los tshaj tawm cov txheeb cais nkag, suav nrog cov lus txib leej twg thiab kawg. Log, Operating system, Operating System cov ntsiab lus.
Pom zoo:
Yuav ua li cas yog ib tug txheej txheem nyob rau hauv lub operating system dab tsi yog ib tug xov nyob rau hauv lub operating system?
Ib tug txheej txheem, nyob rau hauv cov nqe lus yooj yim tshaj, yog ib tug executingprogram. Ib tug los yog ntau tshaj threads khiav nyob rau hauv cov ntsiab lus ntawm cov txheej txheem. Ib tug xov yog ib qho tseem ceeb chav tsev uas theoperating system faib lub sij hawm processor. Lub threadpool feem ntau yog siv los txo tus naj npawb ntawm cov ntaub ntawv thov thiab muab kev tswj hwm ntawm cov neeg ua haujlwm threads
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Pej xeem txhais tau hais tias txoj kev pom thiab tuaj yeem raug hu los ntawm lwm yam khoom ntawm lwm hom. Lwm cov kev xaiv yog tus kheej, tiv thaiv, pob thiab pob-private.Qhov no txhais tau hais tias koj tuaj yeem hu rau txoj kev zoo li qub yam tsis muaj kev tsim anobject ntawm chav kawm. void txhais tau hais tias txoj kev tsis muaj nqi