2016 Update

Task/Soundex/UNIX-Shell/soundex-2.sh

@@ -0,0 +1,36 @@
+soundex() {
+    local -u word=${1//[^[:alpha:]]/.}
+    local letter=${word:0:1}
+    local soundex=$letter
+    local previous=$letter
+
+    word=${word:1}
+    word=${word//[AEIOUY]/.}
+    word=${word//[WH]/=}
+
+    while [[ ${#soundex} -lt 4 && -n $word ]]; do
+        letter=${word:0:1}
+
+        if [[ $letter == "." ]]; then
+            previous=""
+
+        elif [[ $letter == "=" ]]; then
+            if [[ $previous == [A-Z] && ${word:1:1} == [A-Z] ]] &&
+               [[ ${value[$previous]} -eq ${value[${word:1:1}]} ]]
+            then
+                word=${word:1}
+            fi
+
+        elif [[ -z $previous ]] ||
+             [[ $letter != $previous && ${value[$letter]} -ne ${value[$previous]} ]]
+        then
+            previous=$letter
+            soundex+=${value[$letter]}
+        fi
+
+        word=${word:1}
+    done
+    # right pad with zeros
+    soundex+="000"
+    echo "${soundex:0:4}"
+}