stack.sh

stack.sh is a simple shell tool that implements a directory stack, allowing you to save and manage a list of directories.

Features

Push the current directory onto the stack
Pop the top directory from the stack
Swap the current directory with the top of the stack
List all directories in the stack
Remove the entire stack

Usage

stack [ up | dw | sw | ls | rm | help ]

Commands

up: Push the current directory onto the stack
dw: Pop the top directory from the stack and display it
sw: Replace the top of the stack with the current directory and display the previous top
ls: List all directories in the stack
rm: Remove the entire stack
help: Display help information

Installation

Save the script as stack.sh in a directory included in your PATH.
Make the script executable:
```
chmod +x stack.sh
```
You can now use the tool by running stack.sh or simply stack if you rename it.

How it works

The stack is stored in a file named stack_<PPID> in the /tmp/stackdata/ directory.
Each directory is stored as a separate line in the stack file.
The script uses standard Unix commands like pwd, head, tail, and wc to manipulate the stack.

Notes

The script uses set -e to exit immediately if any command fails.
If no arguments are provided, the script will display an error message and the usage information.
Invalid commands will display the usage information and exit with an error code.

License

This project is licensed under the MIT License. See the LICENSE file in the repository for the full license text.