sed.py

A simple script to perform basic sed-like text manipulations on files or strings using Python.

Description

sed.py allows you to perform text substitutions, deletions, insertions, and other manipulations on text files or strings. The script supports multiple commands and provides feedback after each command is executed.

Examples

• Substitute (s): replace "brown" with "green" in example.txt:

  python sed.py -e "s/brown/green/" example.txt
  

• Append (a): Append text after each line matched by a pattern:

  python sed.py -e "a/append/additional text/" sample.txt
  

• Insert (i): Insert text before each line matched by a pattern on all lines:

  python BasicSedSed.py "i/sample/insert this text/" example.txt
  

• Delete (d): Delete lines matching a pattern on lines:

  python sed.py -e "d/data/" example.txt
  

• Print ('p'): Print lines containing "All" in example.txt:

  python sed.py -e "p/pattern/" sample.txt
  

• You can combine multiple commands using the -e option multiple times::

  python sed.py -e "s/old/new/" -e "d/remove/" sample.txt
  

  or

  python sed.py -e "command1;command2;..." filename.txt
  

• Or using script file:

  python sed.py -f script_file.sed sample.txt
  

Options

• -e :Add the script of editing commands to the end of the script. This option can be used multiple times.
• -f :Add the editing commands in the file script_file to the end of the script. This option can be used multiple times.

Output

For each command, the script provides feedback:

• If the pattern is found, it prints the relevant lines.
• If the pattern is not found, it prints a proper message.
• After all commands are executed, it prints the final content.

Help

To display the help message with the available commands:

python sed.py --help

To activate the venv:

cd to the script path
venv\Scripts\activate

Error Values

• 0: Successful completion.
• 1: No commands provided.
• 2: File not found.
• 3: Invalid command format.
• 4: Error processing file.
• 5: Error reading file.
• 6: Error writing file.
• 7: Unknown error.

Unit Test

to activate the unittest:

python -m unittest unit_test.py