更新时间:2023-02-23 14:36:36
我跳过检查你看看这行是否已经存在,通常是像这样(这里我想用'BAR'替换'FOO'): / p>
full_path_to_read = File.expand_path('〜/ test1.txt')
full_path_to_write = File.expand_path('〜/ test2.txt')
File.open(full_path_to_read)do | source_file |
contents = source_file.read
contents.gsub!(/ FOO /,'BAR')
File.open(full_path_to_write,w +){| f | f.write(contents)}
end
使用 expand_path
在这里也可能有点儿迂腐,但是我喜欢它,所以我不会不小心打开一些我并不想要的文件。
I have this little program I write in ruby. I found a nice piece of code here, on SO, to find and replace something in a file, but it doesn't seems to work. Here's the code:
#!/usr/bin/env ruby
DOC = "test.txt"
FIND = /,,^M/
SEP = "\n"
#make substitution
File.read(DOC).gsub(FIND, SEP)
#Check if the line already exist
unique_lines = File.readlines(DOC).uniq
#Save the result in a new file
File.open('test2.txt', 'w') { |f| f.puts(unique_lines) }
Thanks everybody !
I skip the check you make to see if the line already exists and usually go with something like this (here I want to replace 'FOO' with 'BAR'):
full_path_to_read = File.expand_path('~/test1.txt')
full_path_to_write = File.expand_path('~/test2.txt')
File.open(full_path_to_read) do |source_file|
contents = source_file.read
contents.gsub!(/FOO/, 'BAR')
File.open(full_path_to_write, "w+") { |f| f.write(contents) }
end
The use of expand_path
is also probably a bit pedantic here, but I like it just so that I don't accidentally clobber some file I didn't mean to.