Steam game shell script testing in osh.

hl.sh

#!/bin/bash

# figure out the absolute path to the script being run a bit
# non-obvious, the ${0%/*} pulls the path out of $0, cd's into the
# specified directory, then uses $PWD to figure out where that
# directory lives - and all this in a subshell, so we don't affect
# $PWD

GAMEROOT=$(cd "${0%/*}" && echo $PWD)

#determine platform
UNAME=`uname`
if [ "$UNAME" == "Darwin" ]; then
   # Workaround OS X El Capitan 10.11 System Integrity Protection (SIP) which does not allow
   # DYLD_INSERT_LIBRARIES to be set for system processes.
   if [ "$STEAM_DYLD_INSERT_LIBRARIES" != "" ] && [ "$DYLD_INSERT_LIBRARIES" == "" ]; then
      export DYLD_INSERT_LIBRARIES="$STEAM_DYLD_INSERT_LIBRARIES"
   fi
   # prepend our lib path to LD_LIBRARY_PATH
   export DYLD_LIBRARY_PATH=${GAMEROOT}:$DYLD_LIBRARY_PATH
elif [ "$UNAME" == "Linux" ]; then
   # prepend our lib path to LD_LIBRARY_PATH
   export LD_LIBRARY_PATH=${GAMEROOT}:$LD_LIBRARY_PATH
fi

if [ -z $GAMEEXE ]; then
        if [ "$UNAME" == "Darwin" ]; then
          GAMEEXE=hl_osx
        elif [ "$UNAME" == "Linux" ]; then
          GAMEEXE=hl_linux
        fi
fi

ulimit -n 2048

# and launch the game
cd "$GAMEROOT"

STATUS=42
while [ $STATUS -eq 42 ]; do
        ${DEBUGGER} "${GAMEROOT}"/${GAMEEXE} $@
        STATUS=$?
done
exit $STATUS

hl.sh-results.txt

powerkitten@blaze-pc:~/Desktop/depotdownloader-2.3.0-hotfix1/halflife$ osh hl.sh
  GAMEROOT=$(cd "${0%/*}" && echo $PWD)
                ^
hl.sh:9: cd '/home/powerkitten/Desktop/depotdownloader-2.3.0-hotfix1/halflife/hl.sh': Not a directory
  ulimit -n 2048
  ^~~~~~
hl.sh:34: Can't execute 'ulimit': No such file or directory
        ${DEBUGGER} "${GAMEROOT}"/${GAMEEXE} $@
                    ^
hl.sh:41: Can't execute '/hl_linux': No such file or directory