It sounds like you want a Python script that will:
* Search for files in the current directory (or a specified directory) whose names contain the substring "abcd".
* Open each matching file.
* Read the content of the file.
* Replace all occurrences of the string "qwerty" with "youo" within the content.
* Write the modified content back to the file.
Here is a Python script to accomplish this. It uses the os module for file system operations and the re module for robust string replacement, although a simple str.replace() is also fine for this specific case. I will use str.replace() for simplicity.
Python Code
import os
def replace_text_in_files(directory='.', filename_substring='abcd', old_text='qwerty', new_text='youo'):
"""
Searches for files containing a specific substring in their name within a directory,
and replaces a given text string inside those files.
Args:
directory (str): The directory to search in. Defaults to the current directory ('.').
filename_substring (str): The substring to look for in the file names.
old_text (str): The text to be replaced.
new_text (str): The replacement text.
"""
print(f"Starting search in directory: {os.path.abspath(directory)}")
found_files = 0
modified_files = 0
try:
# 1. Iterate over all entries in the directory
for filename in os.listdir(directory):
filepath = os.path.join(directory, filename)
# Check if it's a file and contains the filename substring
if os.path.isfile(filepath) and filename_substring in filename:
print(f"\n--- Processing file: {filename} ---")
found_files += 1
try:
# 2. Open and read the entire content
with open(filepath, 'r') as file:
original_content = file.read()
# 3. Check if the text to be replaced exists
if old_text in original_content:
print(f"Found '{old_text}' inside the file. Replacing...")
# 4. Replace the text
new_content = original_content.replace(old_text, new_text)
# 5. Open the file again in write mode ('w') and write the new content
with open(filepath, 'w') as file:
file.write(new_content)
modified_files += 1
print(f"Replacement successful. File updated.")
else:
print(f"'{old_text}' not found in file. Skipping update.")
except Exception as e:
print(f"An error occurred while reading/writing file {filename}: {e}")
except FileNotFoundError:
print(f"Error: Directory not found: {directory}")
except Exception as e:
print(f"An unexpected error occurred: {e}")
print("\n--- Summary ---")
print(f"Files matching '{filename_substring}': {found_files}")
print(f"Files successfully modified: {modified_files}")
print("Operation complete.")
# --- Execution ---
if __name__ == "__main__":
# You can change '.' to a specific path like '/home/user/my_docs'
# The default '.' means the current working directory where the script is run.
replace_text_in_files(
directory='.',
filename_substring='abcd',
old_text='qwerty',
new_text='youo'
)
How to Use the Code
* Save: Save the code above as a Python file (e.g., file_replacer.py).
* Create Test Files: In the same directory where you saved the script, create a few test files.
* test_abcd_1.txt (content: This is a test with qwerty data.)
* another_abcd_file.log (content: The key is qwerty but also another qwerty.)
* not_matching_file.txt (content: This should be ignored.)
* Run: Open your terminal or command prompt, navigate to that directory, and run the script:
python file_replacer.py
* Check: After execution, open the files that contained "abcd" in their name. The text "qwerty" should now be replaced with "youo".
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