On Tue, Aug 02, 2005 at 01:15:35PM +0200, Joerg Sonnenberger wrote: > On Tue, Aug 02, 2005 at 02:06:32PM +0300, Vasil Dimov wrote: > > On Tue, Aug 02, 2005 at 12:52:34PM +0200, Dario Freni wrote: > > > Vasil Dimov wrote: > > > > Even we can use > > > > if [ -d /tmp -a -w /tmp ] ; then > > > > or (which is equivalent) > > > > if [ -d /tmp ] && [ -w /tmp ] ; then > > > > and save external commands (mkdir) execution and directory > > > > creation/deletion at all. > > > > > > You can't use test -w here. The script is checking if there is a > > > read-only filesystem. -w checks only the file flags (according to the > > > man page, at least). > > > > > That's correct, -w cannot be used to check read-only filesystem. > > Actually, you can. That's not portable behaviour though. >
Well, look what I discovered: # mount |grep read-only /usr/ports on /mnt/ar0s2d/usr/ports5 (nullfs, local, read-only) # sh -c '[ -w /mnt/ar0s2d/usr/ports5 ] && echo writeable' # bash -c '[ -w /mnt/ar0s2d/usr/ports5 ] && echo writeable' writeable # One should really not rely on this.
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