Ukwenza lokhu, cindezela u-Esc , thayipha inombolo yomugqa, bese ucindezela u-Shift-g . Uma ucindezela u-Esc bese u-Shift-g ngaphandle kokucacisa inombolo yomugqa, kuzokuyisa kulayini wokugcina efayelini.
Ngingena kanjani emgqeni wefayela ku-Linux?
The need to get/print a particular line of a file on the Linux shell is a common task. Luckily there are various ways to do this.
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Izindlela ezi-3 zokuthola i-Nth Line yefayela ku-Linux
- ikhanda / umsila. Ukusebenzisa nje inhlanganisela yemiyalo yekhanda nomsila cishe kuyindlela elula kakhulu. …
- sed. …
- awu.
Uya kanjani emgqeni othile ngokuncane?
Ukuze uye ekugcineni, cindezela usonhlamvukazi G. Ukuze uye emgqeni othile, faka inombolo ngaphambi kokucindezela izinkinobho ze-g noma ze-G.
Ngiwubuka kanjani umugqa wefayela?
Ithuluzi i-wc “ikhawunta yamagama” kumasistimu wokusebenza afana ne-UNIX, kodwa ungaphinda uyisebenzise ukubala imigqa efayeleni ukwengeza inketho -l. i-wc -l foo izobala inani lemigqa ku- foo .
Ngiwubonisa kanjani umugqa wokuqala wefayela ku-Linux?
Thayipha umyalo wekhanda olandelayo ukuze ubonise imigqa yokuqala eyi-10 yefayela elibizwa ngokuthi “bar.txt”:
- ikhanda -10 bar.txt.
- ikhanda -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 bese uphrinta' /etc/passwd.
- perl -ne'1..20 bese uphrinta' /etc/passwd.
Ngiwenza kanjani umugqa kusuka kufayela?
Umyalo we-grep usesha ifayela, ufuna okufanayo nephethini eshiwo. Ukuyisebenzisa thayipha grep , bese kuba iphethini esiseshayo kanye ekugcineni igama lefayela (noma amafayela) esicinga kuwo. Okukhiphayo yimigqa emithathu efayeleni equkethe izinhlamvu ezithi 'hhayi'.
Uthini umyalo wokuvezwa kohlu lwamafayela?
Bona izibonelo ezilandelayo:
- Ukufaka ohlwini wonke amafayela ohlwini lwemibhalo lwamanje, thayipha okulandelayo: ls -a Lokhu kuklelisa wonke amafayela, kuhlanganisa. ichashazi (.)…
- Ukuze ubonise imininingwane enemininingwane, thayipha okulandelayo: ls -l chap1 .profile. …
- Ukuze ubonise ulwazi oluningiliziwe mayelana nohla lwemibhalo, thayipha okulandelayo: ls -d -l .
Imuphi umyalo ozosusa yonke imigqa engenalutho embhalweni omdala wefayela?
8. Imuphi umyalo ozosusa yonke imigqa engenalutho kufayela elidala. txt? Incazelo: None.
Ngilifaka kanjani ifayela ku-Linux?
Ungawusebenzisa kanjani umyalo we-grep ku-Linux
- I-Grep Command Syntax: grep [izinketho] PATTERN [IFILE...] ...
- Izibonelo zokusebenzisa i-'grep'
- grep foo /file/name. …
- grep -i "foo" /file/name. …
- grep 'iphutha 123' /file/name. …
- grep -r “192.168.1.5” /etc/ …
- grep -w “foo” /file/name. …
- egrep -w 'word1|word2' /file/name.
Ngibala kanjani inani lemigqa efayeleni?
Ungabala kanjani imigqa efayeleni ku-UNIX/Linux
- Umyalo othi “wc -l” uma usetshenziswa kuleli fayela, ukhipha isibalo somugqa kanye negama lefayela. $ wc -l file01.txt 5 file01.txt.
- Ukuze ukhiphe igama lefayela kumphumela, sebenzisa: $ wc -l < file01.txt 5.
- Ungakwazi njalo ukunikeza okukhipha umyalo kumyalo we-wc usebenzisa ipayipi. Ngokwesibonelo:
Yimuphi umyalo osetshenziselwa ukukhomba amafayela?
Umyalo 'wefayela' usetshenziselwa ukukhomba izinhlobo zefayela. Lo myalo uhlola impikiswano ngayinye futhi uyihlukanise. I-syntax ithi 'ifayela [option] File_name'.
Ngiyikhombisa kanjani imigqa yokuqala eyi-10 yefayela ku-Linux?
Ukubheka imigqa embalwa yokuqala yefayela, thayipha igama lefayela lekhanda, lapho igama lefayela kuyigama lefayela ofuna ukulibuka, bese ucindezela . Ngokuzenzakalelayo, ikhanda likukhombisa imigqa yokuqala eyi-10 yefayela. Ungakushintsha lokhu ngokuthayipha igama lefayela elithi head -number, lapho inombolo iyinombolo yemigqa ofuna ukuyibona.
Uyini umyalo wokubonisa imigqa yokuqala yefayela eyi-10 ku-Linux?
Umyalo wekhanda, njengoba igama lisho, phrinta inombolo ephezulu engu-N yedatha yokokufaka okunikeziwe. Ngokuzenzakalelayo, iphrinta imigqa yokuqala eyi-10 yamafayela ashiwo. Uma kunikezwe igama lefayela elingaphezu kwelilodwa khona-ke idatha evela kufayela ngalinye yandulelwa igama lefayela layo.
Ngiwufunda kanjani umugqa wokuqala wefayela?
Sebenzisa ifayela. readline() ukufunda umugqa owodwa efayelini
Vula ifayela kumodi yokufunda nge-syntax ene-open(igama lefayela, imodi) njengefayela: ngemodi ethi “r” . Ifayela lekholi. umugqa wokufunda() ukuze uthole umugqa wokuqala wefayela futhi ugcine lokhu ku-variable first_line .