From type/IO/Spec/Cygwin

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method rel2abs(|c --> List:D)

Same as IO::Spec::Win32.rel2abs, except replaces backslashes with slashes in the final result.

From type/IO/Spec/Win32

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method rel2abs(Str() $path, $base = $*CWD --> Str:D)

Returns a string representing $path converted to absolute path, based at $base, which defaults to $*CWD. If $base is not an absolute path, it will be made absolute relative to $*CWD, unless $*CWD and $base are the same.

say $*CWD;                                   # OUTPUT: «"C:\Users\camelia".IO␤» 
 
say IO::Spec::Win32.rel2abs: 'foo';          # OUTPUT: «C:\Users\camelia\foo␤» 
say IO::Spec::Win32.rel2abs: './';           # OUTPUT: «C:\Users\camelia␤» 
say IO::Spec::Win32.rel2abs: 'foo/../../';   # OUTPUT: «C:\Users\camelia\foo\..\..␤» 
say IO::Spec::Win32.rel2abs: '/foo/';        # OUTPUT: «C:\foo␤» 
 
say IO::Spec::Win32.rel2abs: 'foo', 'bar';   # OUTPUT: «C:\Users\camelia\bar\foo␤» 
say IO::Spec::Win32.rel2abs: './', '/bar';   # OUTPUT: «\bar␤» 
say IO::Spec::Win32.rel2abs: '/foo/', 'bar'; # OUTPUT: «C:\foo␤» 
 
say IO::Spec::Win32.rel2abs: 'foo/../../', 'bar';
# OUTPUT: «C:\Users\camelia\bar\foo\..\..␤» 

From type/IO/Spec/Unix

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method rel2abs(Str() $path, $base = $*CWD --> Str:D)

Returns a string representing $path converted to absolute path, based at $base, which defaults to $*CWD. If $base is not an absolute path, it will be made absolute relative to $*CWD, unless $*CWD and $base are the same.

say $*CWD;                                  # OUTPUT: «"/home/camelia".IO␤» 
 
say IO::Spec::Unix.rel2abs: 'foo';          # OUTPUT: «/home/camelia/foo␤» 
say IO::Spec::Unix.rel2abs: './';           # OUTPUT: «/home/camelia␤» 
say IO::Spec::Unix.rel2abs: 'foo/../../';   # OUTPUT: «/home/camelia/foo/../..␤» 
say IO::Spec::Unix.rel2abs: '/foo/';        # OUTPUT: «/foo␤» 
 
say IO::Spec::Unix.rel2abs: 'foo', 'bar';   # OUTPUT: «/home/camelia/bar/foo␤» 
say IO::Spec::Unix.rel2abs: './', '/bar';   # OUTPUT: «/bar␤» 
say IO::Spec::Unix.rel2abs: '/foo/', 'bar'; # OUTPUT: «/foo␤» 
 
say IO::Spec::Unix.rel2abs: 'foo/../../', 'bar';
# OUTPUT: «/home/camelia/bar/foo/../..␤»