Ukuze Ususe imigqa efayeleni lomthombo ngokwalo, sebenzisa inketho -i ngomyalo we-sed. Uma ungafisi ukususa imigqa efayelini elingumthombo langempela ungaqondisa kabusha okukhiphayo kwe-sed command uye kwelinye ifayela.
Ngiyikhipha kanjani imigqa efayelini?
Sebenzisa i-del ukuze ususe umugqa efayelini lapho indawo yawo yaziwa khona ngokuthi {#use-del)
- a_file = vula(“sample.txt”, “r”) thola uhlu lwemigqa.
- imigqa = a_file. imigqa yokufunda()
- ifayela_.
- del lines[1] susa imigqa.
- new_file = vula(“sample.txt”, “w+”) bhala kufayela ngaphandle komugqa.
- ngomugqa emigqeni:
- new_file. bhala(umugqa)
- new_file.
How do I remove all lines from a file in Linux?
Ngokushesha ngemva kokuvula ifayela, thayipha u-“gg” ukuze uhambise ikhesa emgqeni wokuqala wefayela, ucabange ukuthi ayikho. Khona-ke thayipha dG ku susa yonke imigqa noma umbhalo kuyo. Uma i-Vim ikwenye imodi, isibonelo, faka imodi, ungangena kwimodi evamile ngokucindezela u-Esc noma .
Ngiyisusa kanjani imigqa yokuqala eyi-10 ku-Unix?
Isebenza kanjani:
- -i inketho hlela ifayela ngokwalo. Ungase futhi ususe leyo nketho bese uqondisa kabusha okukhiphayo efayeleni elisha noma komunye umyalo uma ufuna.
- 1d isusa umugqa wokuqala ( 1 ukwenza kuphela kulayini wokuqala, d ukuwususa)
- I-$d isusa umugqa wokugcina ( $ ukwenza kuphela kulayini wokugcina, d ukuwususa)
Ngiyisusa kanjani imigqa yokugcina engu-10 ku-Unix?
Ijikeleza kancane, kodwa ngicabanga ukuthi kulula ukuyilandela.
- Bala inani lemigqa efayeleni elikhulu.
- Susa inombolo yemigqa ofuna ukuyisusa esibalweni.
- Phrinta inombolo yemigqa ofuna ukuyigcina futhi uyigcine kufayela lesikhashana.
- Shintshanisa ifayela eliyinhloko ufake ifayela lesikhashana.
- Susa ifayela lesikhashana.
Uyisusa kanjani imigqa eminingi ku-Unix?
Isusa Imigqa Eminingi
- Cindezela ukhiye we-Esc ukuze uye kumodi evamile.
- Beka ikhesa kulayini wokuqala ofuna ukuwususa.
- Thayipha u-5dd bese ucindezela u-Enter ukuze ususe imigqa emihlanu elandelayo.
Ngiwususa kanjani umugqa wokuqala ku-Unix?
Ukusebenzisa the sed Command
Ukukhipha umugqa wokuqala efayelini lokufaka usebenzisa i-sed command kuqondile kakhulu. Umyalo we-sed esibonelweni esingenhla awunzima ukuwuqonda. Ipharamitha '1d' itshela umyalo we-sed ukuthi usebenzise isenzo 'd' (susa) enombolweni '1'.
Kuyini ukusetshenziswa kwe-awk ku-Linux?
I-Awk iyinsiza eyenza umhleli akwazi ukubhala izinhlelo ezincane kodwa eziphumelelayo ngendlela yezitatimende ezichaza amaphethini ombhalo okufanele aseshwe kulayini ngamunye wedokhumenti kanye nesenzo okufanele sithathwe lapho okufanayo kutholakala ngaphakathi umugqa. I-Awk isetshenziswa kakhulu ukuskena iphethini nokucubungula.
Ngiyikhipha kanjani imigqa yokuqala eyi-10 yefayela?
Susa imigqa yokuqala engu-N yefayela esendaweni emugqeni womyalo we-unix
- Kokubili izinketho ze-sed -i kanye ne-gawk v4.1 -i -inplace ngokuyisisekelo zakha ifayela lesikhashana ngemuva kwezigcawu. I-IMO sed kufanele isheshe kunomsila futhi i-awk. -…
- umsila ushesha izikhathi eziningi kulo msebenzi, kune-sed noma i-awk . (
Ngiwususa kanjani ulayini wokugcina ku-Unix?
Izimpendulo ze-6
- Sebenzisa i-sed -i '$d' ukuhlela ifayela endaweni. -…
- Kungaba yini ukususa imigqa engu-n yokugcina, lapho u-n eyinombolo ephelele? -…
- @JoshuaSalazar for i in {1..N}; do sed -i '$d' ; usuqedile ungakhohlwa ukufaka u-N – ghilesZ Oct 21 '20 ngo-13:23.