Kuti muwone mizere yoyambirira ya fayilo, lembani dzina la fayilo, pomwe filename ndi dzina la fayilo yomwe mukufuna kuyang'ana, kenako dinani.
Kodi ndimapeza bwanji mizere 10 yoyamba ya fayilo ku Unix?
Lembani mutu wotsatira kuti muwonetse mizere 10 yoyamba ya fayilo yotchedwa "bar.txt":
- mutu -10 bar.txt.
- mutu -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 ndi kusindikiza' /etc/passwd.
- perl -ne'1..20 ndi kusindikiza' /etc/passwd.
18 дек. 2018 g.
Kodi mumapanga bwanji mizere 10 yoyamba?
mutu -n10 filename | grep ... mutu utulutsa mizere 10 yoyamba (pogwiritsa ntchito -n), ndiyeno mutha kuyika zotulukazo kuti grep . Mutha kugwiritsa ntchito mzere wotsatirawu: mutu -n 10 /path/to/file | grep […]
Kodi mumapeza bwanji mzere woyamba wa fayilo ku Unix?
Mumawonetsa mizere yoyamba ya fayilo pogwiritsa ntchito mutu.
Kodi ndimawona bwanji mizere 10 yomaliza ya fayilo ku Unix?
Linux tail command syntax
Mchira ndi lamulo lomwe limasindikiza mizere ingapo yomaliza (mizere 10 mwachisawawa) ya fayilo inayake, kenako ndikumaliza. Chitsanzo 1: Mwachikhazikitso "mchira" umasindikiza mizere 10 yomaliza ya fayilo, ndikutuluka. monga mukuwonera, izi zimasindikiza mizere 10 yomaliza ya /var/log/messages.
Kodi mumapeza bwanji mizere 10 yafayilo?
Kuti muwone mizere yoyambirira ya fayilo, lembani dzina la fayilo, pomwe filename ndi dzina la fayilo yomwe mukufuna kuyang'ana, kenako dinani. . Mwachikhazikitso, mutu umakuwonetsani mizere 10 yoyamba ya fayilo. Mutha kusintha izi polemba mutu -number filename, pomwe nambala ndi mizere yomwe mukufuna kuwona.
Kodi ndimakopera bwanji mizere 10 yomaliza ku Linux?
1. kuwerengera kuchuluka kwa mizere mufayilo, pogwiritsa ntchito `mphaka f. txt | wc -l` kenako kugwiritsa ntchito mutu ndi mchira posindikiza mizere yomaliza 81424 ya fayilo (mizere #totallines-81424-1 mpaka #totallines).
Kodi mumayika bwanji mizere ingapo?
Kwa BSD kapena GNU grep mutha kugwiritsa ntchito -B num kuyika mizere ingati masewerawo asanachitike ndi -Nambala pamizere pambuyo pamasewera. Ngati mukufuna mizere yofanana musanayambe kapena mutatha kugwiritsa ntchito -C num . Izi ziwonetsa mizere itatu patsogolo ndi mizere itatu pambuyo pake.
Kodi lamulo la mphaka limachita chiyani?
Lamulo la 'paka' [lifupi la "concatenate"] ndi limodzi mwamalamulo omwe amagwiritsidwa ntchito mobwerezabwereza mu Linux ndi makina ena opangira. Lamulo la mphaka limatithandiza kupanga mafayilo amodzi kapena angapo, kuwona komwe kuli mafayilo, kusungitsa mafayilo ndikuwongoleranso zotuluka mu terminal kapena mafayilo.
Kodi grep command imachita chiyani?
grep ndi chida chamzere cholamula posaka ma seti omveka bwino a mizere yomwe imagwirizana ndi mawu okhazikika. Dzina lake limachokera ku lamulo la ed g/re/p (padziko lonse fufuzani mawu okhazikika ndi kusindikiza mizere yofananira), yomwe imakhala ndi zotsatira zofanana.
Kodi ndimawerenga bwanji mzere woyamba wa fayilo?
Gwiritsani ntchito fayilo.
Tsegulani fayilo mumayendedwe owerengera ndi mawu omasulira ndi open(filename, mode) ngati fayilo: yokhala ndi "r" . Imbani fayilo. readline() kuti mupeze mzere woyamba wa fayilo ndikusunga izi mumzere woyamba_line .
Kodi ndimawonetsa bwanji mzere wamafayilo ku Unix?
Nkhani
- awk : $>awk '{ngati(NR==LINE_NUMBER) sindikizani $0}' file.txt.
- sed : $>sed -n LINE_NUMBERp file.txt.
- mutu : $>mutu -n LINE_NUMBER file.txt | mchira -n + LINE_NUMBER Apa LINE_NUMBER ndi, nambala ya mzere yomwe mukufuna kusindikiza. Zitsanzo: Sindikizani mzere kuchokera pafayilo imodzi.
26 gawo. 2017 g.
Kodi mumawerenga bwanji mzere woyamba wa fayilo mu chipolopolo?
Kuti musunge mzere wokha, gwiritsani ntchito var=$(command) syntax. Apa, mzere=$(awk 'NR==1 {print; exit}' file) . Ndi mzere wofanana=$(sed -n '1p' file) . idzakhala yachangu pang'ono popeza kuwerenga ndi lamulo lokhazikika la bash.
Kodi ndingadziwe bwanji chipolopolo changa chapano?
Momwe mungayang'anire chipolopolo chomwe ndikugwiritsa ntchito: Gwiritsani ntchito malamulo otsatirawa a Linux kapena Unix: ps -p $$ - Onetsani dzina lanu lachipolopolo modalirika. echo "$SHELL" - Sindikizani chipolopolo cha omwe akugwiritsa ntchito koma osati chipolopolo chomwe chikuyenda.
Kodi ndi njira yotani yowerengera kuchuluka kwa zilembo ndi mizere mufayilo?
Lamulo la "wc" kwenikweni limatanthauza "kuwerengera mawu" ndipo ndi magawo osiyanasiyana osasankha munthu atha kuligwiritsa ntchito kuwerengera mizere, mawu, ndi zilembo mufayilo yamawu. Kugwiritsa ntchito wc popanda zosankha kumakupatsani mawerengero a ma byte, mizere, ndi mawu (-c, -l ndi -w).
Kodi Linux kernel ndi chiyani?
Linux® kernel ndiye chigawo chachikulu cha Linux opareshoni system (OS) ndipo ndiye mawonekedwe oyambira pakati pa zida zamakompyuta ndi machitidwe ake. Imalumikizana pakati pa 2, kuyang'anira zinthu moyenera momwe mungathere.