Scripting, counting the number of readable, writable, and executable items

$ man find

#!/bin/sh

# Make sure we have a directory 
if [ $# -ne 1 ]
then
  echo "Must specify a directory name"
  exit 2
else
  if [ ! -d "$1" ]
  then
    echo "Specified directory does no exist"
    exit 3
  fi
fi

# set up a temporary file name
TF=/tmp/$0.tmp

# Long listing (minus user and group, for sake of efficiency) to temp file
#   copying only the first field which is the attributes, as we only care about counts
ls -log "$1" | awk '{print $1}' | grep -v total > $TF
# Look for each attribute in turn and count (the -c) it
r_count=$(grep -c "r" $TF)
w_count=$(grep -c "w" $TF)
x_count=$(grep -c "x" $TF)
# show the results
echo "Read: $r_count"
echo "Write: $w_count"
echo "Execute: $x_count"

# Tidy up
rm $TF
exit