I need to search a specific xml file in a directory, look for:
<port system-property="tangosol.coherence.clusterport">30890</port>
and if the port 30890 is still there replace it with a different
integer.
I know of several ways to do this (like open the file, iterate the
lines until I find the integer, do a gsub! on on the integer). But it
seems like there might be a better way to do it. Is there a search
and replace API I don't know about?
Any thoughts?
Look for ruby -pi.bak -e 'gsub ...'
robert
On 03.04.2007 17:47, phil.swenson@gmail.com wrote:
I need to search a specific xml file in a directory, look for:
<port system-property="tangosol.coherence.clusterport">30890</port>
and if the port 30890 is still there replace it with a different
integer.I know of several ways to do this (like open the file, iterate the
lines until I find the integer, do a gsub! on on the integer). But it
seems like there might be a better way to do it. Is there a search
and replace API I don't know about?
well I *THOUGHT* I knew how to do it, here's my first crack at it:
file_name = base_config_path + '/Caching/tangosol-
coherence.xml'
File.open(file_name, File::RDWR).each{ |line|
if line.gsub!(/30890/, port.to_s)
puts "tangosol port overridden with %d" % port
break
end
}
The gsub doesn't modify the line, guess it just modifies the string.
How do I actually modify the file itself?
btw, I did look at rexml but it looked like overkill for this. I'll
take another look though.
def ChangeOnFile(file, regex_to_find, text_to_put_in_place)
text= File.read file
File.open(file, 'w+'){|f| f << text.gsub(regex_to_find,
text_to_put_in_place)}
end
Then:
ChangeOnFile('/etc/myfile.conf', /30890/, "32737")
Phil Swenson wrote:
I need to search a specific xml file in a directory, look for:
<port system-property="tangosol.coherence.clusterport">30890</port>
and if the port 30890 is still there replace it with a different
integer.I know of several ways to do this (like open the file, iterate the
lines until I find the integer, do a gsub! on on the integer). But it
seems like there might be a better way to do it. Is there a search
and replace API I don't know about?Any thoughts?
--
Posted via http://www.ruby-forum.com/\.
well I *THOUGHT* I knew how to do it, here's my first crack at it:
file_name = base_config_path + '/Caching/tangosol-
coherence.xml'
File.open(file_name, File::RDWR).each{ |line|
if line.gsub!(/30890/, port.to_s)
puts "tangosol port overridden with %d" % port
break
end
}The gsub doesn't modify the line, guess it just modifies the string.
Exactly.
How do I actually modify the file itself?
Read it, modify it, write it. Or use ruby -pi.bak ...
robert
On 03.04.2007 18:56, phil.swenson@gmail.com wrote:
gsub! is destructive - it edits in-place and does not return a value. You could get a value back from gsub, but then you'd need to do something with that value.
The following worked, though I don't consider it elegant:
require 'fileutils'
File.open("/tmp/replaceable2.txt", 'w+') do | new_file |
new_file.puts(File.open('/tmp/replaceable.txt', 'r') do | original_file |
original_file.read.gsub('30890', '44444')
end)
end
FileUtils.mv("/tmp/replaceable2.txt", "/tmp/replaceable.txt")
If you don't want the intermediate file, you could do something like this:
new_str = File.open('/tmp/replaceable.txt', 'r') { | f | f.read.gsub('30890', '44444') }
File.open('/tmp/replaceable.txt', w+) { |f| f.puts new_str }
Bob
On Apr 3, 2007, at 10:00 AM, phil.swenson@gmail.com wrote:
well I *THOUGHT* I knew how to do it, here's my first crack at it:
file_name = base_config_path + '/Caching/tangosol-
coherence.xml'
File.open(file_name, File::RDWR).each{ |line|
if line.gsub!(/30890/, port.to_s)
puts "tangosol port overridden with %d" % port
break
end
}The gsub doesn't modify the line, guess it just modifies the string.
How do I actually modify the file itself?btw, I did look at rexml but it looked like overkill for this. I'll
take another look though.
Actually, that was pretty sloppy, by opening the file in read-write mode, and then rewinding after the read, we can overwrite it with the changes in a one-liner:
File.open("/tmp/replaceable.txt", 'r+') { |f| newstr = f.read.gsub('33333', '00000'); f.rewind; f.puts(newstr) }
Bob
On Apr 4, 2007, at 12:39 PM, Robert Evans wrote:
gsub! is destructive - it edits in-place and does not return a value. You could get a value back from gsub, but then you'd need to do something with that value.
The following worked, though I don't consider it elegant:
require 'fileutils'
File.open("/tmp/replaceable2.txt", 'w+') do | new_file |
new_file.puts(File.open('/tmp/replaceable.txt', 'r') do | original_file |
original_file.read.gsub('30890', '44444')
end)
end
FileUtils.mv("/tmp/replaceable2.txt", "/tmp/replaceable.txt")If you don't want the intermediate file, you could do something like this:
new_str = File.open('/tmp/replaceable.txt', 'r') { | f | f.read.gsub('30890', '44444') }
File.open('/tmp/replaceable.txt', w+) { |f| f.puts new_str }Bob
http://www.junitfactory.com/On Apr 3, 2007, at 10:00 AM, phil.swenson@gmail.com wrote:
well I *THOUGHT* I knew how to do it, here's my first crack at it:
file_name = base_config_path + '/Caching/tangosol-
coherence.xml'
File.open(file_name, File::RDWR).each{ |line|
if line.gsub!(/30890/, port.to_s)
puts "tangosol port overridden with %d" % port
break
end
}The gsub doesn't modify the line, guess it just modifies the string.
How do I actually modify the file itself?btw, I did look at rexml but it looked like overkill for this. I'll
take another look though.
And note, this won't erase any left over old file contents that extend beyond the length of the current file, e.g., if the port number is a shorter number of characters than the old port number.
Bob
On Apr 4, 2007, at 12:44 PM, Robert Evans wrote:
Actually, that was pretty sloppy, by opening the file in read-write mode, and then rewinding after the read, we can overwrite it with the changes in a one-liner:
File.open("/tmp/replaceable.txt", 'r+') { |f| newstr = f.read.gsub('33333', '00000'); f.rewind; f.puts(newstr) }
Bob
On Apr 4, 2007, at 12:39 PM, Robert Evans wrote:
gsub! is destructive - it edits in-place and does not return a value. You could get a value back from gsub, but then you'd need to do something with that value.
The following worked, though I don't consider it elegant:
require 'fileutils'
File.open("/tmp/replaceable2.txt", 'w+') do | new_file |
new_file.puts(File.open('/tmp/replaceable.txt', 'r') do | original_file |
original_file.read.gsub('30890', '44444')
end)
end
FileUtils.mv("/tmp/replaceable2.txt", "/tmp/replaceable.txt")If you don't want the intermediate file, you could do something like this:
new_str = File.open('/tmp/replaceable.txt', 'r') { | f | f.read.gsub('30890', '44444') }
File.open('/tmp/replaceable.txt', w+) { |f| f.puts new_str }Bob
http://www.junitfactory.com/On Apr 3, 2007, at 10:00 AM, phil.swenson@gmail.com wrote:
well I *THOUGHT* I knew how to do it, here's my first crack at it:
file_name = base_config_path + '/Caching/tangosol-
coherence.xml'
File.open(file_name, File::RDWR).each{ |line|
if line.gsub!(/30890/, port.to_s)
puts "tangosol port overridden with %d" % port
break
end
}The gsub doesn't modify the line, guess it just modifies the string.
How do I actually modify the file itself?btw, I did look at rexml but it looked like overkill for this. I'll
take another look though.