Reliable way for a bash script to get the full path to itself? - Stack Overflow

Reliable way for a bash script to get the full path to itself? - Stack Overflow

I'm surprised that the realpath command hasn't been mentioned here. My understanding is that it is widely portable / ported.

Your initial solution becomes:

SCRIPT=`realpath $0`  SCRIPTPATH=`dirname $SCRIPT`

And to leave symbolic links unresolved per your preference:

SCRIPT=`realpath -s $0`  SCRIPTPATH=`dirname $SCRIPT`

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