#!/usr/bin/env bash # Define the word to search for PATTERN="nologin" FILE="/etc/shells" # Check if the configuration file exists if [ ! -f "$FILE" ]; then echo "File $FILE not found." exit 1 fi grep -q -E "$PATTERN" "$FILE" >/dev/null FOUND=$? if [ $FOUND -eq 0 ]; then echo "The line containing '$PATTERN' is in the File $FILE." exit 1 else echo "$PATTERN is not in the File or not Found" exit 0 fi