1. Lamulo losasintha lomwe limabwera m'maganizo mwathu ndi lamulo la mutu. mutu wokhala ndi mwayi "-1" ukuwonetsa mzere woyamba.
Kodi mumapeza bwanji mzere woyamba wa fayilo ku Unix?
Mumawonetsa mizere yoyamba ya fayilo pogwiritsa ntchito mutu.
Kodi ndimapeza bwanji mzere woyamba wa fayilo mu Linux?
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 mumapeza bwanji mzere wina kuchokera ku fayilo ku Unix?
- 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. Kuti tisindikize mzere wa 4 kuchokera pa fayilo ndiye kuti tidzayendetsa malamulo otsatirawa.
26 gawo. 2017 g.
Kodi mumalumphira bwanji mzere woyamba ku Unix?
Mzere woyamba wa fayilo ukhoza kudumpha pogwiritsa ntchito malamulo osiyanasiyana a Linux. Monga tawonera mu phunziro ili, pali njira zosiyanasiyana zodumpha mzere woyamba wa fayilo pogwiritsa ntchito lamulo la `awk`. Zachidziwikire, kusinthika kwa NR kwa lamulo la `awk` kungagwiritsidwe ntchito kudumpha mzere woyamba wa fayilo iliyonse.
Mumawonetsa bwanji mizere 10 yoyamba 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 ndimawerenga bwanji mzere woyamba wa fayilo?
Gwiritsani ntchito fayilo. readline() kuti muwerenge mzere umodzi kuchokera pafayilo
Imbani fayilo. readline() kuti mupeze mzere woyamba wa fayilo ndikusunga izi mumzere woyamba_line . Pangani chosinthika chachiwiri, last_line , ndikubwereza mizere yonse mufayilo mpaka kumapeto.
Kodi ndimawerengera bwanji mizere mufayilo mu Linux?
Njira yosavuta yowerengera kuchuluka kwa mizere, mawu, ndi zilembo zamafayilo ndikugwiritsa ntchito lamulo la Linux "wc" mu terminal. Lamulo la "wc" kwenikweni limatanthauza "kuwerengera mawu" ndipo ndi magawo osiyanasiyana osasankha munthu atha kuligwiritsa ntchito kuwerengera mizere, mawu, ndi zilembo mufayilo yamawu.
Kodi ndikuwonetsa bwanji mzere wina mu Linux?
Momwe Mungawonetsere Mizere Yachindunji ya Fayilo mu Linux Command Line
- Onetsani mizere yeniyeni pogwiritsa ntchito malamulo amutu ndi mchira. Sindikizani mzere umodzi wokhazikika. Sindikizani mizere yeniyeni.
- Gwiritsani ntchito SED kuti muwonetse mizere yeniyeni.
- Gwiritsani ntchito AWK kusindikiza mizere yeniyeni kuchokera pafayilo.
2 pa. 2020 g.
Kodi mumawonjezera bwanji mzere ku fayilo mu Linux?
Mwachitsanzo, mutha kugwiritsa ntchito lamulo la echo kuti muwonjezere mawuwo kumapeto kwa fayilo monga momwe zasonyezedwera. Kapenanso, mutha kugwiritsa ntchito printf command (musaiwale kugwiritsa ntchito n character kuwonjezera mzere wotsatira). Mutha kugwiritsanso ntchito lamulo la mphaka kuti mulumikizane ndi fayilo imodzi kapena zingapo ndikuziphatikiza ku fayilo ina.
Kodi mumakopera bwanji mzere mu Linux?
Ngati cholozera chili kumayambiriro kwa mzerewo, chimadula ndi kukopera mzere wonsewo. Ctrl + U: Dulani gawo la mzere patsogolo pa cholozera, ndikuwonjezera pa bolodi lojambulapo. Ngati cholozera chili kumapeto kwa mzerewo, chimadula ndikukopera mzere wonsewo. Ctrl+Y: Ikani mawu omaliza omwe adadulidwa ndikukopera.
Kodi ndimasindikiza bwanji mizere mu awk?
Kugwiritsa ntchito AWK kusefa Mizere
- awk “{sindikiza NF}” < pos_cut.txt | uniq.
- awk '{sindikiza $1 $2}' pos_cut.txt.
- awk '/2410626/' pos_cut.txt.
- awk '{if($8 >= 11000000) {sindikiza}}' pos_cut.txt | mutu.
- awk -F “t” '{ ngati(($7 == 6) && ($8 >= 11000000)) {sindikiza }}}' pos_cut.txt | mchira.
9 pa. 2016 g.
Kodi ndimanyalanyaza bwanji mzere woyamba mu Linux?
4 Mayankho. Chifukwa chake fo you -n +2 iyenera kudumpha mzere woyamba. Mutha kupondereza mzere wamutu kuchokera pamzere ndi -h -option. Izi zitha kuthetsa kufunika kochotsa mzere woyamba.
Kodi mumachotsa bwanji mzere woyamba ndi womaliza ku Unix?
Momwe zimagwirira ntchito:
- -i njira yosinthira fayilo yokha. Mutha kuchotsanso njirayi ndikuwongolera zomwe zatuluka ku fayilo yatsopano kapena lamulo lina ngati mukufuna.
- 1d imachotsa mzere woyamba (1 kungochita pamzere woyamba, d kuchotsa)
- $d amachotsa mzere womaliza ( $ kungochita pamzere womaliza, d kuwuchotsa)
11 inu. 2015 g.
Kodi mumalumphira bwanji mzere muzolemba zachipolopolo?
Kugwiritsira ntchito mutu kuti mupeze mizere yoyamba ya mtsinje, ndi mchira kuti mutenge mizere yomaliza mumtsinje ndi mwachilengedwe. Koma ngati mukufuna kudumpha mizere yoyambirira ya mtsinje, ndiye kuti mumagwiritsa ntchito mawu akuti "-n +k" mchira. Ndipo kulumpha mizere yomaliza ya mawu akuti "-n -k" mawu.