Solved acronym in Bash

bash/acronym/acronym.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+# replaces any character that is not alphanumeric ([:alnum:]),
+# a blank space ([:blank:]), or a single quote (') with a space character
+# and convert to uppercase
+phrase=$(echo "$1" | tr -c "[:alnum:][:blank:]'" " " | tr "[:lower:]" "[:upper:]")
+
+# appends the first character of each word to $acronym
+for word in $phrase; do
+    acronym+=$(echo "${word:0:1}")
+done
+
+echo "$acronym"