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  1. or download this
    cd /var/tmp
mkdir mydir
...
mkdir otherdir
cd otherdir
ln -s ../mydir symdir
  2. or download this
    #!/usr/bin/perl

...
print 'dirname($0):',dirname($0),"/../datadir\n";
print 'dirname(rel2abs($0)):',dirname(rel2abs($0)),"/../datadir\n";
print '$FindBin::RealBin:',$FindBin::RealBin,"/../datadir\n";
  3. or download this
    Finding a data path:

...
dirname($0):/usr/local/bin/../datadir
dirname(rel2abs($0)):/usr/local/bin/../datadir
$FindBin::RealBin:/var/tmp/mydir/../datadir