Cov txheej txheem:
Video: Koj piv li cas hauv awk?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov neeg ua haujlwm sib piv hauv Awk yog siv los sib piv tus nqi ntawm cov lej lossis cov hlua thiab lawv suav nrog cov hauv qab no:
- > - ntau dua.
- <- tsawg dua.
- >= – ntau dua los yog sib npaug.
- <= – tsawg dua los yog sib npaug.
- == – sib npaug.
- !=
- some_value ~ / qauv / – muaj tseeb yog tias some_value phim cov qauv.
Hauv qhov no, awk siv rau dab tsi?
AWK hais kom ua hauv Unix/Linux nrog piv txwv. Awk yog ib hom lus scripting siv rau manipulating cov ntaub ntawv thiab tsim cov ntaub ntawv. Cov awk hais lus programming lus yuav tsum tsis muaj compiling, thiab tso cai rau tus neeg siv siv variables, numeric functions, string functions, thiab logical operators.
Qhov thib ob, dab tsi yog awk hauv plhaub ntawv? Awk yog ib qho cuab yeej zoo heev rau kev tsim UNIX / Linux plhaub scripts . AWK yog a programming hom lus uas yog tsim los ua cov ntaub ntawv raws li cov ntaub ntawv, xws li hauv cov ntaub ntawv lossis cov ntaub ntawv ntws, lossis siv plhaub cev. Hauv lwm lo lus koj tuaj yeem ua ke awk nrog plhaub scripts los yog siv ncaj qha ntawm a plhaub kom sai.
Hais txog qhov no, dab tsi yog NF hauv awk?
NF yog ib qho kev hloov pauv ua ntej uas nws tus nqi yog tus naj npawb ntawm cov teb hauv cov ntaub ntawv tam sim no. awk cia li hloov kho tus nqi ntawm NF txhua zaus nws nyeem ntawv. Txawm hais tias muaj pes tsawg daim teb, daim teb kawg hauv cov ntaub ntawv tuaj yeem sawv cev los ntawm $ NF . Yog li ntawd, $ NF yog tib yam li $7, uas yog ' piv txwv.
Koj hais li cas rau awk?
Hauv awk lus, a tawm tswv yim pib nrog tus lej cim cim (' # ') thiab txuas ntxiv mus rau qhov kawg ntawm kab. Tus ' # ' tsis tas yuav yog thawj tus cim ntawm kab. Cov awk lus ignores tus so ntawm ib kab tom qab tus lej kos npe.
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