Ruby common file operation code example

Ruby common file operation code example

This article mainly introduces common Ruby file operation code instances, such as file creation, output file content, IO operations, output file path, and stringio usage. For more information, see

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# Create a 222. rb file and input characters File = File. open ("222.rb"," w + ") File. puts "123 \ nwadwa \ n12124124 \ ndwdw" File. close     # Output 222. rb content File. open ("222.rb"," r + ") do | file | While line = file. gets Puts line End End     # Directly using IO to operate files IO. foreach ("222.rb") do | line | Puts line if line = ~ /Abc/# The output matches the row of 'abc '. Puts line if line !~ /Qwe/# The output does not match the row where 'qw' is located. End       # Absolute path of the output file Puts File. expand_path ("222.rb ")     # Count chars from a file File = File. new ("222.rb ") W_count = 0 File. each_byte do | byte | W_count + = 1 if byte =? 1 End Puts "# {w_count }"     # Create new file and write some words there Print "The file now is exist? -->" Puts File. exist? ("Asd.txt") # determine whether a file exists   File = File. new ("asd.txt", "w ") Print "The file now is exist? -->" Puts File. exist? ("Asd.txt ")   File. write ("hehe \ nhahah ")     # Io. stream operation Require 'stringio' Ios = StringIO. new ("abcdef \ n ABC \ n 12345 ") Ios. seek (5) # Move the offset pointer to 5 (where the e letter is located) Ios. puts ("xyz3") # overwrite the original data from 5 Puts ios. tell # tell -- Returns the current offset (in bytes) of ios. Puts ios. string Puts ios. string. dump # ignore the escape of \ n     # Another example Require 'stringio' Ios = StringIO. new ("abcdef \ nq9ert \ n 12345 ") Ios. seek (3) Ios. ungetc (? W) # replace the char at index 3 Puts "Ptr =#{ ios. tell }" S1 = ios. gets # filte the "\ n" S2 = ios. gets Puts s1 Puts s2     # Ruby open a file and write data Txt = File. open ("File path", "w + ") Txt. puts 'content of the file to be written' Txt. close # Reading data from a file Num = File. readlines ("File path") [0]. chomp # How to open a file System ("notepad file path ")