the outputs of a program can be to STDOUT or STDERR ( and also to files
it opens internally )
On unix like systems
STDOUT is known by &1
STDERR by &2
The output of a program on STDOUT goes wherever 1 is directed to
similarly for STDERR 2
If U want to redirect STDERR to STDOUT use 2>&1
eg. program >/dev/null 2>&1 will destroy all output of the program
Ning Luo wrote:
>
> Hi Sir
>
> I have a perl script using system function, like
> system("perl goup 1>basicName.scan 2>basicName.err");
>
> goup is another perl script, what I want to do is executing goup, then
> print the results to the file basicName.scan, if it abort abnormally
> print the error message to file basicName.err.Would you mind give a
> help how to do this.
>
> I have an example about system call, like
> system ("perl goup 1>basicName.err 2>&1 ")
> This is to print error message to file basicName.err, there is no
> syntax error, but I am not sure the meaning of 1 and 2>&1.
>
> Thanks in advance
>
> sincere yours
>
> Ning
>
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