Initial data commit

Task/I-before-E-except-after-C/UNIX-Shell/i-before-e-except-after-c.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+matched() {
+  grep -Poe "$1" unixdict.txt | wc -l
+}
+
+check() {
+  local num_for="$(matched "$3")"
+  local num_against="$(matched "$2")"
+  if [ "$num_for" -le "$(expr 2 \* "$num_against")" ]; then
+    echo "Clause $1 not plausible ($num_for examples; $num_against counterexamples)"
+    return 1
+  else
+    echo "Clause $1 is plausible ($num_for examples; $num_against counterexamples)"
+    return 0
+  fi
+}
+
+check 1 '(?<!c)ei' '(?<!c)ie'
+PLAUSIBLE_1=$?
+check 2 'cie' 'cei'
+PLAUSIBLE_2=$?
+if [ $PLAUSIBLE_1 -eq 0 -a $PLAUSIBLE_2 -eq 0 ]; then
+  echo "Overall, the rule is plausible"
+else
+  echo "Overall, the rule is not plausible"
+fi