Implement shell command to output names of files in sample files directory

Author: ike-agu

shell-pipelines/ls-grep/script-03.sh

@@ -5,4 +5,4 @@ set -euo pipefail
 # TODO: Write a command to output the names of the files in the sample-files directory whose name starts with an upper case letter and doesn't contain any other upper case letters.
 # Your output should contain 7 files.
 
-
+ls sample-files | grep '^[A-Z][^A-Z]*$'