Fix template for squeak script

Author: ludat

platforms/unix/config/squeak.sh.in

@@ -1,7 +1,7 @@
-#!/bin/sh
+#!/usr/bin/env bash
 # Run the VM, setting SQUEAK_PLUGINS if unset to the VM's containing directory
 # if unset, and ensuring LD_LIBRARY_PATH includes the VM's containing directory.
-BIN=`/usr/bin/dirname "$0"`/@expanded_relative_imgdir@
+BIN=$(dirname "$0")/@expanded_relative_imgdir@
 GDB=
 if [ "${SQUEAK_PLUGINS-unset}" = unset ]; then
 	export SQUEAK_PLUGINS="$BIN"
@@ -15,7 +15,7 @@ fi
 # At least on linux LD_LIBRARY_PATH's components must be absolute path names
 case "$BIN" in
 /*) PLUGINS="$BIN";;
-*) PLUGINS="`pwd`/$BIN"
+*) PLUGINS="$(pwd)/$BIN"
 esac
 
 if [ $(uname -s) = "OpenBSD" ]; then
@@ -26,8 +26,8 @@ fi
 # libc (e.g. through the FFI) then it must use the same version that the VM uses
 # and so it should take precedence over /lib libc.  This is done by setting
 # LD_LIBRARY_PATH appropriately, based on ldd's idea of the libc use by the VM.
-LIBC_SO="`/usr/bin/ldd "$BIN/squeak" | /bin/fgrep /libc. | sed 's/^.*=> \([^ ]*\).*/\1/'`"
-PLATFORMLIBDIR=`expr "$LIBC_SO" : '\(.*\)/libc.*'`
+LIBC_SO="$(ldd "$BIN/squeak" | fgrep /libc. | sed 's/^.*=> \([^ ]*\).*/\1/')"
+PLATFORMLIBDIR=$(expr "$LIBC_SO" : '\(.*\)/libc.*')
 
 if [ "$PLATFORMLIBDIR" = "" ]; then
 {
@@ -37,7 +37,7 @@ if [ "$PLATFORMLIBDIR" = "" ]; then
 	echo "  LIBC_SO="$LIBC_SO
 	cat /etc/*-release*  |  grep -v // | sed 's/^/  /' 
 	echo -n "  UNAME=" ; uname -a
-	MACHINE=`uname -m`
+	MACHINE=$(uname -m)
 	case "$MACHINE" in
 		*64*)
 			echo "  System seems to be 64 bit. You may need to (re)install the 32-bit libraries."