Solution for pangram

bash/pangram/pangram.sh

@@ -1,24 +1,17 @@
 #!/usr/bin/env bash
 
-# The following comments should help you get started:
-# - Bash is flexible. You may use functions or write a "raw" script.
-#
-# - Complex code can be made easier to read by breaking it up
-#   into functions, however this is sometimes overkill in bash.
-#
-# - You can find links about good style and other resources
-#   for Bash in './README.md'. It came with this exercise.
-#
-#   Example:
-#   # other functions here
-#   # ...
-#   # ...
-#
-#   main () {
-#     # your main function code here
-#   }
-#
-#   # call main with all of the positional arguments
-#   main "$@"
-#
-# *** PLEASE REMOVE THESE COMMENTS BEFORE SUBMITTING YOUR SOLUTION ***
+# Convert to lowercase and remove non-alphabetic characters
+sentence_alpha="$(echo "$1" | tr '[:upper:]' '[:lower:]' | tr -cd '[:alpha:]')"
+
+# `fold -w1` splits the string into individual characters, one per line
+# `sort -u` remove duplicates
+# `tr` delete newline characters
+sentence_unique="$(echo -n "${sentence_alpha}" | fold -w1 | sort -u | tr -d '\n')"
+
+# Check if the unique alphabets count is 26 (total number of English alphabets)
+if [[ ${#sentence_unique} == 26 ]]; then
+    echo "true"
+else
+    echo "false"
+fi
+