`readlink` fails with `-f` option

[thenickcox]

On OS X 10.10.5, running this script calls readlink -f here, which fails, and causes the script to fail:

$ /usr/local/sbin/auto-mysql-backup/runmysqlbackup.sh
readlink: illegal option -- f
usage: readlink [-n] [file ...]
usage: dirname path
No confFile found; Remote copy DISABLED.
Couldn't find the automysqlbackup script.

Interesting thing is, running man readlink clearly shows a -f option:

-f format
             Display information using the specified format.  See the FORMATS section for a description of valid formats.

Is there a more failsafe way to define the $PDIR variable?

[sund]

That was the best for all the linux versions at the time.

under Mac OS the -f switch does something else...

 -f, --canonicalize
              canonicalize  by  following  every  symlink in every component of the given name recur‐
              sively; all but the last component must exist

Ah the differences between BSD and GNU.

I'll have to look into it.

[sund]

As a workaround, replace line 7 with the following:

PDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )/"

I'm working on a more platform-agnostic way of determining the PDIR

[thenickcox]

Good to know. Thanks, @sund.