How read a file line by line in Linux shell script?
Faʻafefea ona faitau se faila i luga ole laiga ile Bash. O le faila faila ($input) o le igoa o le faila e te manaʻomia e te faʻaogaina le poloaiga faitau. O le fa'atonuga faitau e faitau le faila i lea laina ma lea laina, tu'u laina ta'itasi i le $line bash shell variable. A faitau loa laina uma mai le faila o le a taofi le bash while loop.
E faʻafefea ona ou vaʻaia se laina faila i Linux?
Grep o se meafaigaluega laina laina Linux / Unix faʻaaogaina e suʻe ai se manoa o mataʻitusi i se faila faʻapitoa. O le mamanu su'esu'e tusitusiga e ta'ua o se fa'aaliga masani. A maua se fetaui, e lolomi le laina ma le taunuuga. O le grep command e faʻaaogaina pe a suʻesuʻe i faila faila tetele.
How do you read a file line by line while looping in Unix?
The following syntax is used for bash shell to read a file using while loop:
- while read -r laina; do. echo “$laina” ; done < input.faila.
- aʻo IFS= faitau -r laina; do. echo $laina; done < input.faila.
- $ a o faitau laina; do. echo $laina; done < OS.txt.
- #!/bin/bash. filename=’OS.txt’ n=1. …
- #!/bin/bash. filename=$1. a o faitau laina; do.
E fa'afefea ona e faitauina mea o lo'o i totonu o se faila i le shell script?
Faitauina o Faiga Fa'aoga Fa'aaogā Fa'amatalaga
- #!/bin/bash.
- faila='read_file.txt'
- i = 1.
- a o faitau le laina; fai.
- # Faitau laina taʻitasi.
- si'uleo “Line Nu. $ i : $line”
- i=$((i+1))
- faia <$file.
E fa'afefea ona e lolomi se laina ma lea laina ile Unix?
Tusi se tala bash e lolomi ai se laina patino mai se faila
- awk : $>awk '{if(NR==LINE_NUMBER) lolomi $0}' file.txt.
- sed : $>sed -n LINE_NUMBERp faila.txt.
- ulu : $>ulu -n LINE_NUMBER faila.txt | si'usi'u -n + LINE_NUMBER Lenei LINE_NUMBER o, ole numera laina e te mana'o e lolomi. Faataitaiga: Lolomi se laina mai le faila e tasi.
O le a le faʻaogaina o le awk i Linux?
O le Awk o se aoga e mafai ai e se tagata fai polokalame ona tusia ni polokalame laiti ae aoga i le tulaga o faʻamatalaga e faʻamalamalamaina ai mamanu o tusitusiga e tatau ona suʻeina i laina taʻitasi o se pepa ma le gaioiga e tatau ona faia pe a maua se fetaui i totonu o se. laina. Awk e masani ona faʻaaogaina mo fa'ata'ita'iga ma fa'agaioiga.
E faʻafefea ona ou faʻaogaina le sailiga i Linux?
O le poloaiga saili o le fa'aaoga e su'e ma su'e le lisi o faila ma fa'atonuga e fa'atatau i tulaga e te fa'amaoti mo faila e fetaui ma finauga. saili le poloaiga e mafai ona faʻaaogaina i tulaga eseese e pei e mafai ona e mauaina faila e ala i faʻatagaga, tagata faʻaoga, vaega, ituaiga faila, aso, lapopoa, ma isi tulaga talafeagai.
E faʻapefea ona e faʻaalia le numera laina i se manoa i Linux?
Ole filifiliga -n (poʻo -line-number) e taʻu atu ai le grep i fa'aali le numera o laina o lo'o i ai se manoa e fetaui ma se mamanu. A fa'aoga lea filifiliga, e lolomi e le grep le fa'atusa i galuega masani e fa'apipi'i ma le numera laina. O le fa'aaliga o lo'o i lalo o lo'o fa'aalia mai ai o lo'o maua fa'atasiga i laina 10423 ma le 10424.
How do I read a loop file?
faʻaaogā tatala() to read each line in a file using a for-loop
Call open(file) to open the file named file . Use the syntax for line in file: to iterate over the previous result file . At each iteration, line is a string representing the current line in file .
How do I read a while loop file?
Let’s break down what will happen when the above code is submitted. pusi /etc/passwd will read the contents of the file and pass it as input through the pipe. read command reads each line passed as input from cat command and stores it in the LREAD variable. read command will read file contents until EOL is interpreted.
E fa'afefea lau faitau ile bash?
faitau o se bash e fausia i totonu o le poloaiga e faitau se laina mai le faʻaoga masani (pe mai le faila faila) ma vaeluaina le laina i upu. O le upu muamua e tofia i le igoa muamua, o le upu lona lua i le igoa lona lua, ma isi. O le fa'asologa lautele o le faitau na fausia i totonu e fa'aogaina le fomu nei: faitau [filifiliga] [igoa…]
How do you read the last line of a file in Unix?
Ina ia tilotilo i nai laina mulimuli o se faila, fa'aaoga le poloaiga si'usi'u. si'usi'u e galue i le auala lava e tasi e pei o le ulu: fa'aigoa si'usi'u ma le igoa faila e va'ai ai laina mulimuli e 10 o lena faila, po'o le fa'ailoga tail -numera igoa faila e va'ai ai laina numera mulimuli o le faila. Taumafai e fa'aoga le si'usi'u e va'ai i laina mulimuli e lima o lau .
E faʻafefea ona ou grep se faila i Linux?
Faʻafefea ona faʻaogaina le grep command i Linux
- Grep Command Syntax: grep [filifiliga] PATTERN [FILE…] ...
- Fa'ata'ita'iga o le fa'aogaina o le 'grep'
- grep foo /file/igoa. …
- grep -i "foo" / faila / igoa. …
- grep 'sese 123' / faila / igoa. …
- grep -r "192.168.1.5" /etc/ ...
- grep -w "foo" / faila / igoa. …
- egrep -w 'word1|word2' /file/igoa.
E faʻafefea ona e fatuina se faila i Linux?
Faʻafefea ona fatuina se faila faila ile Linux:
- Fa'aaogā le pa'i e fai ai se faila faila: $ touch NewFile.txt.
- Fa'aaogā pusi e fai ai se faila fou: $ cat NewFile.txt. …
- Na'o le fa'aoga > e fai ai se faila faila: $ > NewFile.txt.
- I le mea mulimuli, e mafai ona tatou faʻaogaina soʻo se igoa faʻatonu tusitusiga ona fai lea o le faila, pei o: