Requirements

For this assignment a simple and naive version of sed will be created.

This requirements will be:

• Only the substitution command is required.
• Create a command line utility that accepts options and arguments.
• The first argument will be the command and the second one will be the file.
• Check if the file specified exists.
• Check if the substitution command is valid.
• Implement the -n option, which prevents a line from being printed unless specified by ‘p’.
• Implement the -i [extension] which tells sed to edit the file instead of printing to the standard output.
• A copy of the original should be saved in [file_name].[extension]
• Multiple substitution commands should be accepted with the -e option, with one command per -e appearance.
• When the -n option appears, the line should not be printed to the standard output unless specified.
• The -f [script-file] option should expect a file which consists of several lines containing one command each.
• Implement the p flag which tells that the line should be printed.
• Implement the g flag which tells that all occurrences of the search should be replaced on the line. By default only the first occurrence of each line is replaced.

Ecosystem

Operating system: Ubuntu 20.04.2 LTS Node: v14.17.4 npm: 6.14.14

Installation

• Download the repository and within it run npm install

• Or install the package from npm with npm install sedclone -g

Use

• If you downloaded the repository then you can use it with node index.js --help

• If you installed globally from npm then you can use sedclone --help