How do I print the nth line in Linux?
M~N with “p” command prints every Nth line starting from line M. For example, 3~2p prints every 2nd line starting from 3rd line as shown below.
Mumawerenga bwanji mzere wa nth ku Unix?
N is the line number that you want. For example, tail -n+7 input. txt | head -1 will print the 7th line of the file.
...
- tail -n+N | head -1 : 3.7 sec.
- head -N | tail -1 : 4.6 sec.
- sed Nq;d : 18.8 sec.
How do I print the nth line of a file?
Lembani bash script kuti musindikize mzere wina kuchokera pa fayilo
- 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.
Kodi ndimayika bwanji fayilo mu Linux?
Momwe mungagwiritsire ntchito lamulo la grep ku Linux
- Grep Command Syntax: grep [zosankha] PATTERN [FILE…] ...
- Zitsanzo zogwiritsa ntchito 'grep'
- grep foo /file/name. …
- grep -i "foo" /file/name. …
- grep 'error 123' /file/name. …
- grep -r "192.168.1.5" /etc/ ...
- grep -w "foo" /file/name. …
- egrep -w 'word1|word2' /file/name.
Kodi ndimayika bwanji nambala yeniyeni mu Linux?
Njira ya -n (kapena -line-number). tells grep to show the line number of the lines containing a string that matches a pattern. When this option is used, grep prints the matches to standard output prefixed with the line number.
Kodi kugwiritsa ntchito awk mu Linux ndi chiyani?
Awk ndi chida chomwe chimathandizira wopanga mapulogalamu kuti alembe mapulogalamu ang'onoang'ono koma ogwira mtima ngati mawu omwe amatanthauzira zolemba zomwe ziyenera kufufuzidwa pamzere uliwonse wa chikalata ndi zomwe zikuyenera kuchitika pomwe machesi apezeka mkati mwa mzere. Awk amagwiritsidwa ntchito kwambiri chitsanzo kupanga sikani ndi processing.
Kodi ndingagawanitse bwanji chingwe mu bash?
Mu bash, chingwe chingathenso kugawidwa popanda kugwiritsa ntchito $ IFS variable. Lamulo la 'readarray' ndi -d njira imagwiritsidwa ntchito kugawa data ya chingwe. Njira ya -d imagwiritsidwa ntchito kufotokozera munthu wolekanitsa mu lamulo ngati $ IFS. Komanso, bash loop imagwiritsidwa ntchito kusindikiza chingwecho mu mawonekedwe ogawanika.
Ndi lamulo liti lomwe lingasindikize mizere yonse mufayilo?
Kusindikiza Mizere kuchokera ku Fayilo pogwiritsa ntchito sed
sed "p" lamulo amatilola kusindikiza mizere yeniyeni kutengera nambala ya mzere kapena regex yoperekedwa. sed ndi kusankha -n idzapondereza kusindikiza kwachindunji kwa buffer / space.
How do I extract a specific line from a text file in Unix?
Kuti muchotse mizere ingapo, nenani mizere 2 mpaka 4, mutha kuchita izi:
- $ sed -n 2,4p ena fayilo. ndilembereni.
- $ sed '2,4! d' somefile. ndilembereni.
Kodi NR mu lamulo la awk ndi chiyani?
NR ndi mtundu wokhazikika wa AWK ndipo umasiyana zikuwonetsa kuchuluka kwa marekodi omwe akukonzedwa. Kagwiritsidwe : NR itha kugwiritsidwa ntchito mu block block imayimira kuchuluka kwa mzere womwe ukukonzedwa ndipo ngati igwiritsidwa ntchito mu END imatha kusindikiza kuchuluka kwa mizere yokonzedwa kwathunthu. Chitsanzo : Kugwiritsa ntchito NR kusindikiza nambala ya mzere mu fayilo pogwiritsa ntchito AWK.
Kodi ndingasindikize bwanji mzere wina wake pogwiritsa ntchito sed?
M'nkhani ino ya sed, tiwona momwe tingasindikizire mzere winawake pogwiritsa ntchito print(p) lamulo la sed. Mofananamo, kusindikiza mzere wina, ikani nambala ya mzere patsogolo pa 'p'. $ ikuwonetsa mzere womaliza. !