Add script to remove empty lines from a file

bashExercise/4.sh

@@ -0,0 +1,13 @@
+if [ $# -eq 0 ]; then
+    echo "Usage: $0 <filename>"
+    exit 1
+fi
+
+input_file="$1"
+output_file="${input_file}.tmp"
+
+sed '/^$/d' "$input_file" > "$output_file"
+
+mv "$output_file" "$input_file"
+
+echo "Empty lines removed from $input_file"