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Full Discussion: /dev/null 2>&1 question
Top Forums UNIX for Dummies Questions & Answers /dev/null 2>&1 question Post 35709 by BAM on Tuesday 29th of April 2003 09:14:02 AM
Old 04-29-2003
/dev/null 2>&1 question
Hi,

suppose you have the following line at your crontab :

5 * * * * /usr/mine/script > /dev/null 2>&1

now i understood that the " > /dev/null 2>&1 outputs both Standard outpout and Standard Error messages to the /dev/null device or file...

the first part , " > /dev/null " transfers the stdout messages to the /dev/null, but i am missing the part where the stderr is also dumped at dev/null.....

2(is stderr) >(send) &1 (stdout)...

i am not understanding how you send stdout first to dev/null and then send stderr to stdout which in turn will be sent to dev/null too ???

Thanks.
 

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LEARN ABOUT OPENSOLARIS

dev

dev(7FS)							   File Systems 							  dev(7FS)

NAME

       dev - Device name file system

DESCRIPTION

       The  dev  filesystem  manages  the  name  spaces  of devices under the Solaris operating environment. The global zone's instance of the dev
       filesystem is mounted during boot on /dev.

       A subdirectory under /dev may have unique operational semantics. Most of the common device names under /dev are	created  automatically	by
       devfsadm(1M).   Others,	such  as  /dev/pts,  are dynamic and reflect the operational state of the system. You can manually generate device
       names for newly attached hardware by invoking devfsadm(1M) or implicitly, by indirectly causing	a  lookup  or  readdir	operation  in  the
       filesystem to occur.  For example, you can discover a disk that was attached when the system was powered down (and generate a name for that
       device) by invoking format(1M)).

FILES

       /dev    Mount point for the /dev filesystem in the global zone.

SEE ALSO

       devfsadm(1M), format(1M), devfs(7FS)

NOTES

       The global /dev instance cannot be unmounted.

SunOS 5.11							    9 June 2006 							  dev(7FS)
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