osslip25

Q2import os
import re

def search_file(filename, pattern):
try:
with open(filename, 'r') as file:
for line_number, line in enumerate(file, start=1):
if re.search(pattern, line):
print(f"Pattern found in {filename} at line {line_number}: {line.strip()}")
return
print(f"Pattern not found in {filename}")
except FileNotFoundError:
print(f"File not found: {filename}")
except Exception as e:
print(f"An error occurred: {e}")

def main():
while True:
command = input("myshell$ ")
tokens = command.split()

    if not tokens:
        continue

    if tokens[0] == 'search' and len(tokens) == 4 and tokens[1] == 'f':
        _, _, filename, pattern = tokens
        search_file(filename, pattern)
    elif tokens[0] == 'exit':
        break
    else:
        # Execute other commands
        try:
            pid = os.fork()
            if pid == 0:
                # Child process
                os.execvp(tokens[0], tokens)
            else:
                # Parent process
                os.waitpid(pid, 0)
        except Exception as e:
            print(f"An error occurred: {e}")

if name == "main":
main()