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Re: Read last expression in a file?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116134] Re: Read last expression in a file?
  • From: Albert Retey <awnl at gmx-topmail.de>
  • Date: Thu, 3 Feb 2011 05:29:13 -0500 (EST)
  • References: <ii5rh6$ff3$1@smc.vnet.net> <iibea5$nul$1@smc.vnet.net> <iibh70$ol8$1@smc.vnet.net>

Hi,
>>
>> Run["tail -0 outputfile > tail.txt];
>> Import["tail.txt]
>>
>> I also tried your version: ReadList["!tail outputfile", Expression]
>> but no luck with that either.
>>
>> Any suggestions, anyone?
>>

I've seen you have a version that works, but if you are interested in a
version which doesn't create an intermediate file here is something that
also works for me on Windows (with tail installed from the Resource Kit
Tools):

Import["!tail -0 \"" <> fname <> "\"", "Text"]

my filename did contain spaces, so I needed the enclosing "". Actually
to see what goes wrong it is useful to redirect stderr to stdout, so you
can see error messages, like here:

Import["!tail -0 \"" <> fname <> "\" 2>&1", "Text"]

once you have the command line running, you can of course also use
ReadList directly to perform the conversion to Mathematica expressions:

ReadList["!tail -0 \"" <> fname <> "\"", Expression]

hth,

albert


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