Lab work 5: myrls utility

‍Authors: Andrii Yaroshevych, Pavlo Kryven, Yurii Kharabara

Variant: -

Description

myrls is a simple implementation of the ls(1) command for recursively listing directory contents. The closest output ls can produce is achieved with:

ls -ARFo --time-style="+%Y-%m-%d %H:%M:%S" [path]

‍-A: list all files except . and ..

-R: list subdirectories recursively

-F: append indicator (one of */=>|) to entries

-o: like -l, but do not list group information

--time-style="+%Y-%m-%d %H:%M:%S": show modification time in the specified format

Prerequisites

The project is written in C standard 99 with GNU extensions and does not require any additional libraries.

• C compiler with C99 support (gcc, clang, etc.)
• CMake 3.15 or higher (optional)
• Make (optional)

‍Note

Your system must be POSIX-compliant

Compilation

You can use CMake directly:

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release && cmake --build build

use provided compile.sh script:

./compile.sh -O

or manually:

$(C_COMPILER) -std=gnu99 -O3 -o myrls myrls.c

Usage

myrls [path] [-h|--help]

Where path is a path to the directory or file to be listed. If path is not specified, the current working directory is used.

Use -h or --help to display usage information.

Exit status

myrls returns the following exit values:

• 0 - Success
• 1 - Minor problems encountered during execution (e.g., cannot access file)
• 2 - Fatal error (e.g., cannot allocate memory, command-line usage error)

Details

If ownership of a file is unknown or cannot be determined, the user ID is displayed instead.

Results

Additional tasks

None.

License

The [MIT](LICENSE) License.