Awesome
sh-realpath
A portable, pure shell implementation of realpath
Copy the functions in realpath.sh into your shell script to
avoid introducing a dependency on either realpath
or readlink -f
, since:
realpath
does not come installed by defaultreadlink -f
is not portable to OS-X (relevant man page)
Usage
$ source ./realpath.sh
$ realpath /proc/self
/proc/2772
Or we can get tricky:
$ cd /tmp
$ mkdir -p somedir/targetdir somedir/anotherdir
$ ln -s somedir somedirlink
$ ln -s somedir/anotherdir/../anotherlink somelink
$ ln -s targetdir/targetpath somedir/anotherlink
$ realpath .///somedirlink/././anotherdir/../../somelink
/tmp/somedir/targetdir/targetpath
API
Note: unlike realpath(1)
, these functions take no options; do not use --
to escape any arguments
Function | Description |
---|---|
<pre>realpath PATH</pre> | Resolve all symlinks to PATH , then output the canonicalized result |
<pre>resolve_symlinks PATH</pre> | If PATH is a symlink, follow it as many times as possible; output the path of the first non-symlink found |
<pre>canonicalize_path PATH</pre> | Output absolute path that PATH refers to, resolving any relative directories (. , .. ) in PATH and any symlinks in PATH 's ancestor directories |
readlink Emulation
realpath.sh
includes optional readlink emulation. It exposes a readlink
function that calls the system readlink(1)
if it exists. Otherwise it uses
stat(1)
to emulate the same functionality. In contrast to the functions in
the previous section, you may pass --
as the first argument, since you may be
calling the system readlink(1)
.