redirect

[Praetorian Guard]

The following code snippet can be used to detect if FINDSTR is available:

FINDSTR /? >NUL 2>&1
IF ERRORLEVEL 1 ECHO FINDSTR not available!What does 2>&1 mean?Thanks in
advance.

 

[foxidrive]

The following code snippet can be used to detect if FINDSTR is available:

FINDSTR /? >NUL 2>&1
IF ERRORLEVEL 1 ECHO FINDSTR not available!

What does 2>&1 mean?

It means to direct the STDERR stream (2) to the same place that the STDOUT
stream (1) is going.

In your example STDOUT is redirected to NUL and so the snippet redirects
STDERR to NUL also.

 

[Timo Salmi]

What does 2>&1 mean?

9} How can I suppress script error messages altogether?
http://www.netikka.net/tsneti/info/tscmd009.htm

All the best, Timo

 

[Michael Mattias]

It means to direct the STDERR stream (2) to the same place that the STDOUT
stream (1) is going

Complete explanation of command-line syntax including redirection (and
pretty-well, written IMO):

http://technet.microsoft.com/en-us/library/bb490982.aspx

MCM

 

[Timo Salmi]

Complete explanation of command-line syntax including redirection (and
pretty-well, written IMO):
http://technet.microsoft.com/en-us/library/bb490982.aspx

True. It also is available locally:
hh ntcmds.chm::/redirection.htm
as given in http://www.netikka.net/tsneti/info/tscmd009.htm

All the best, Timo