On Tue, Apr 01, 2003 at 09:44:19AM +1000, Martin wrote:
: $author = "Bernie Pannell" ;
: >
: > > root preexec = /bin/mount /bigdisk 2>&1 >> /tmp/bigdisk-mount.log
: >
: > I've usually put 2>&1 *after* the output file name, eg:
: > command >> logfile 2>&1
: >
: > Is there some difference either way?
:
: from man bash:
:
: Note that the order of redirections is significant. For example, the
: command
:
: ls > dirlist 2>&1
:
: directs both standard output and standard error to the file dirlist, while
because it does the > in order stated
ls stdout to dirlist
ls stderr same as stdout
: the command
:
: ls 2>&1 > dirlist
:
: directs only the standard output to file dirlist, because the standard
: error was duplicated as standard output before the standard output was
: redirected to dirlist.
also does the > in order stated
ls stderr same as current stdout (probably /dev/tty)
ls stdout to dirlist, leaving stderr as already set
Note however that mixing | and > is not strictly left to right, in that
ls 2>&1 | wc
is effectively
make ls stdout go to wc stdin
make ls stderr same as ls stdout
so the | is done *before* the >&
--
Christopher Vance
--
SLUG - Sydney Linux User's Group - http://slug.org.au/
More Info: http://lists.slug.org.au/listinfo/slug
