forget using which to locate commands. assume they are in the path.

set_command_envs

-export PS_OBJDUMP=`which objdump`
-export PS_OBJCOPY=`which objcopy`
-export PS_READELF=`which readelf`
-export PS_NM=`which nm`
-export PS_STRIP=`which strip`
+export PS_OBJDUMP=objdump
+export PS_OBJCOPY=objcopy
+export PS_READELF=readelf
+export PS_NM=nm
+export PS_STRIP=strip
 export PS_DATE="date --iso-8601=seconds"
-export PS_TAR=`which tar`
-export PS_MD5SUM=`which md5sum`
-export PS_TIMEOUT=`which timeout`
-export PS_GREP=`which grep`
+export PS_TAR=tar
+export PS_MD5SUM=md5sum
+export PS_TIMEOUT=timeout
+export PS_GREP=grep