Linux’s “cat” command implemented using Python. It opens the file specified in the command argument and prints it onto console.
Linux Cat Command Project Python
To Build a Linux Cat Command You need to follow the below steps
Step 1. Download Python
You need Python to run this script. You can visit here to download Python and then you need to install packages named:
- argparse
- pathlib
pip install argparse
pip install pathlibStep 2. Write the following code
Write this code in a Python file or directly copy this code and save the file with the name and .py extension linuxcat.py
#!/usr/bin/python
import argparse
from pathlib import Path
from sys import stderr, stdout
import os
class CatError(Exception):
pass
class Logger:
def __init__(self, verbosity=False):
self.verbose = verbosity
def error(self, message):
print(f'ERROR: {message}')
logger = Logger()
'''
Read the selected text file
Example:
your/path/file.txt
'''
def readFile(src: Path):
'''
if the given path is a directory
ERROR the path is a directory
'''
if src.is_dir():
logger.error(f'The path {src}: is a directory')
else:
with open(src, 'r') as f:
for lines in f:
print(lines, end='')
def cli() -> argparse.Namespace:
parser = argparse.ArgumentParser(
prog='cat',
description='cat command implementation in python',
epilog='Example: your/path/file.txt'
)
parser.add_argument(
'source',
type=Path,
help='Source file'
)
return parser.parse_args()
def main():
args = cli()
try:
readFile(args.source)
except CatError as e:
logger.error(e)
exit(1)
except KeyboardInterrupt:
logger.error('\nInterrupt')
'''
Start the program
'''
if __name__ == '__main__':
main()Step 3. Run the code
After saving the code double-click on the file to run the program or simply open Command Prompt and write the following command.
python linuxcat.py