Problem when using variable assignment, backticks in shell script

Tristen Hayfield tristen.hayfield@gmail.com
Tue Aug 29 22:42:00 GMT 2006


One may also do:
read x < temp
in bash
Tristen
Brian Dessent wrote:
> "Silva, Russell" wrote:
>>> x=`/usr/bin/cat < temp`;
>> I don't know what is causing your problem. I ran your testcase several
> times and never saw a failure, but from your description it seems like
> it's the kind of thing that might occur very rarely.
>> My only suggestion is that if your true desire is to actually read the
> contents of a file into a variable, then the above construct is a fairly
> expensive way of doing it. This requires a fork/exec (an operation
> which is extremely slow under cygwin) of /bin/cat, whose purpose is only
> to read from one fd and write to another. If you can live with a
> bash-specific (?) construct, then x=$(< temp) should cause the same
> effect but much more efficiently, as the shell itself just reads the
> file without invoking any subprocesses.
>> Brian
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