BUG: Avoid using realpath to make list_future_warnings.sh compatible on macosx

Author: Marc Garcia <[email protected]>

Closes pandas-dev#19122 from datapythonista/realpath and squashes the following commits:

6bea7d9 [Marc Garcia] BUG: Avoid using realpath to make list_future_warnings.sh compatible with Mac

Author: datapythonista

Diff for: scripts/list_future_warnings.sh

@@ -28,7 +28,7 @@ EXCLUDE+="^pandas/util/_depr_module.py$|"  # generic deprecate module that raise
 EXCLUDE+="^pandas/util/testing.py$|" # contains function to evaluate if warning is raised
 EXCLUDE+="^pandas/io/parsers.py$"  # implements generic deprecation system in io reading
 
-BASE_DIR="$(dirname $(dirname $(realpath $0)))"
+BASE_DIR="$(dirname $0)/.."
 cd $BASE_DIR
 FILES=`grep -RIl "FutureWarning" pandas/* | grep -vE "$EXCLUDE"`
 OUTPUT=()