Ta yaya zan sami layin farko a Linux?
Ee, wannan ita ce hanya ɗaya don samun layin farko na fitarwa daga umarni. Akwai wasu hanyoyi da yawa don kama layin farko kuma, gami da sed 1q (dakata bayan layin farko), sed -n 1p (buga layin farko kawai, amma karanta komai), awk 'FNR == 1' (sai dai buga layin farko, amma kuma, karanta komai) da sauransu.
Ta yaya kuke samun layin farko a Unix?
Buga umarnin kai mai zuwa don nuna layin farko na 10 na fayil mai suna "bar.txt":
- kai -10 bar.txt.
- kai -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 da buga' /etc/passwd.
- perl -ne'1..20 da buga' /etc/passwd.
Ta yaya kuke samun layi na ƙarshe da na farko a cikin Unix?
sed -n '1p;$p' fayil. txt zai buga 1st kuma layin karshe na fayil. txt . Bayan wannan, za ku sami tsarin tsararru mai filin farko (watau tare da fihirisar 0) kasancewar layin farko na fayil , kuma filinsa na ƙarshe shine layin fayil na ƙarshe.
Ta yaya kuliyoyi ke wucewa layi 10?
Don duba ƴan layukan ƙarshe na fayil, yi amfani da umarnin wutsiya. wutsiya tana aiki daidai da kai: rubuta wutsiya da sunan fayil don ganin layin 10 na ƙarshe na waccan fayil, ko rubuta sunan wutsiya-number don ganin layin lamba na ƙarshe na fayil ɗin.
Ta yaya zan cire layin farko a Unix?
Amfani sed Command
Cire layin farko daga fayil ɗin shigarwa ta amfani da umarnin sed yana da sauƙi. Umurnin sed a cikin misalin da ke sama ba shi da wuyar fahimta. Ma'aunin '1d' yana gaya wa umarnin sed don amfani da aikin 'd' (share) akan lamba'1'.
Yaya ake karanta fayil a Unix?
Yi amfani da layin umarni don kewaya zuwa Desktop, sannan rubuta cat myFile. txt . Wannan zai buga abubuwan da ke cikin fayil ɗin zuwa layin umarnin ku. Wannan ra'ayi ɗaya ne da amfani da GUI don danna fayil ɗin rubutu sau biyu don ganin abinda ke ciki.
Menene umarnin don nuna layin fayil 10 na farko a cikin Linux?
Shugaban umurnin, kamar yadda sunan ke nunawa, buga babban adadin N na bayanan da aka bayar. Ta hanyar tsoho, yana buga layin 10 na farko na fayilolin da aka ƙayyade. Idan an samar da sunan fayil fiye da ɗaya to bayanai daga kowane fayil suna gaba da sunan fayil ɗin sa.
Ta yaya zan nuna layin fayil a Unix?
Rubuta rubutun bash don buga wani layi na musamman daga fayil
- awk : $>awk '{if(NR==LINE_NUMBER) buga $0}' file.txt.
- sed : $>sed -n LINE_NUMBERp file.txt.
- kai: $> kai -n LINE_NUMBER file.txt | wutsiya -n + LINE_NUMBER Anan LINE_NUMBER shine, lambar layin da kake son bugawa. Misalai: Buga layi daga fayil ɗaya.
Ta yaya zan buga layi na biyu a Unix?
3 Amsoshi. wutsiya tana nuna layin ƙarshe na fitowar kai kuma layin ƙarshe na fitowar kai shine layin na biyu na fayil ɗin. PS: Game da "me ke damun 'kai | wutsiya'" umurnin - shelltel daidai ne.
Menene NR a cikin umarnin AWK?
NR shine AWK da aka gina a ciki kuma shi yana nuna adadin bayanan da ake sarrafa su. Amfani: Ana iya amfani da NR a aikin toshe yana wakiltar adadin layin da ake sarrafa kuma idan an yi amfani da shi a END yana iya buga adadin layin da aka sarrafa gaba ɗaya. Misali: Amfani da NR don buga lambar layi a cikin fayil ta amfani da AWK.
Ta yaya AWK ke aiki a Unix?
Ana amfani da umarnin AWK a cikin Unix don sarrafa tsari da dubawa. Yana bincika fayiloli ɗaya ko fiye don ganin idan sun ƙunshi layukan da suka dace da ƙayyadaddun alamu sannan kuma aiwatar da ayyukan haɗin gwiwa.