Uma uhlanganisa izinhlamvu ezikhethekile kumaphethini athayiphiwe emugqeni womyalo, zibaleke ngokuzifaka kumamaki wokucaphuna owodwa ukuze uvimbele ukutolikwa okungafanele kwegobolondo noma umyalo womyalo. Ukuze ufanise uhlamvu olukhethekile ku-grep -E, beka i-backslash ( ) ngaphambi komlingiswa.
How do I grep a character in Unix?
For example, grep uses a dollar sign njengohlamvu olukhethekile oluhambisana nesiphetho somugqa - ngakho-ke uma ufuna ngempela ukusesha uphawu lwedola, kufanele ukwandulele ngokuhlehla emuva (futhi ufake yonke iyunithi yezinhlamvu yosesho kumacaphuno owodwa). Kodwa i-fgrep ikuvumela ukuthi uthayiphe lolo phawu lwedola.
How do I use grep to find a symbol?
4.1 Searching for Patterns with grep
- Ukusesha iyunithi yezinhlamvu ethile efayeleni, sebenzisa umyalo we-grep. …
- grep is case-sensitive; that is, you must match the pattern with respect to uppercase and lowercase letters:
- Note that grep failed in the first try because none of the entries began with a lowercase “a.”
How do I grep a dot in Linux?
In grep, a dot character will match any character except a return. But what if you only want to match a literal dot? If you escape the dot: “.”, it will only match another literal dot character in your text.
Ngizenza kanjani izintambo ezihlukile ku-Linux?
Isixazululo:
- Ukusebenzisa i-grep ne-head command. Chofoza ukuphuma komyalo we-grep ukuya kumyalo wekhanda ukuze uthole umugqa wokuqala. …
- Ukusebenzisa inketho ye-m yomyalo we-grep. Inketho ye-m ingasetshenziswa ukubonisa inombolo yemigqa efanayo. …
- Ukusebenzisa i-sed command. Singasebenzisa futhi umyalo we-sed ukuze siphrinte ukuvela okuyingqayizivele kwephethini. …
- Ukusebenzisa umyalo we-awk.
Uzibhala kanjani izinhlamvu ezikhethekile ku-Unix?
Mayelana nokusekela kokhiye abaningi kwe-Unix
Uma uhlamvu lungatholakali kukhibhodi, ungafaka uhlamvu ngalo ngokucindezela inkinobho ekhethekile ethi Bhala kulandele ukulandelana kwamanye amakhi amabili. Bheka ithebula elingezansi ukuze uthole okhiye abasetshenziselwa ukufaka izinhlamvu ezihlukahlukene. Qaphela ukuthi ku-Amaya ungashintsha ukuhleleka kokhiye ababili.
Uyini umphumela womyalo kabani?
Incazelo: ubani owayala ukuphuma imininingwane yabasebenzisi okwamanje abangene ngemvume ohlelweni. Okukhiphayo kuhlanganisa igama lomsebenzisi, igama letheminali (angena kulo), usuku kanye nesikhathi sokungena kwabo njll. 11.
Yiziphi izinketho ezingasetshenziswa ngomyalo we-grep?
Umyalo we-grep usekela izinketho eziningi zokulawula okwengeziwe ekufaniseni:
- -i: yenza usesho olungazweli.
- -n: ibonisa imigqa equkethe iphethini kanye nezinombolo zomugqa.
- -v: ibonisa imigqa engaqukethe iphethini eshiwo.
- -c: ibonisa isibalo samaphethini afanayo.
Uyini umphumela wokuba ubani wc?
i-wc imele inani lamagama. Njengoba igama lisho, lisetshenziselwa ikakhulukazi inhloso yokubala. Isetshenziselwa ukuthola inombolo yemigqa, isibalo samagama, ibhayithi nokubalwa kwezinhlamvu kumafayela ashiwo kuma-agumenti wefayela. Ngokuzenzakalelayo iyabonisa okukhiphayo kwamakholomu amane.
Ithini incazelo ye-grep?
grep a insiza yomugqa womyalo yokusesha amasethi edatha yombhalo ongenalutho emigqeni ehambisana nenkulumo evamile. Igama layo livela kumyalo we-ed g/re/p (sesha emhlabeni wonke isisho esivamile bese uphrinta imigqa efanayo), onomphumela ofanayo.