dryrun

A safe and intelligent dry-run tool for Bash operations.
It simulates potentially destructive shell commands, supports native dry-run flags where available, and provides helpful diagnostics for shell scripts.

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Features

• Real dry-run support for tools like rsync, apt, yum, git, terraform, and kubectl
• Simulation of filesystem commands: rm, cp, mv, mkdir, touch, etc.
• Script parsing to simulate execution line-by-line
• Syntax checking via bash -n
• Static analysis for:
  • Unquoted variable usage
  • Dangerous patterns like rm -rf $VAR
  • Linting with shellcheck

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Usage

dryrun <command> [arguments...]

Examples

dryrun rm -rf /etc
dryrun apt-get install nginx
dryrun cp file.txt /tmp/
dryrun rsync -av . /backup

Extended modes

dryrun syntax script.sh        # Syntax check with bash -n
dryrun trace script.sh         # Print commands without executing them
dryrun script script.sh        # Simulate file operations in a script
dryrun check-vars script.sh    # Warn about unquoted/dangerous variables
dryrun lint script.sh          # Lint the script using shellcheck

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Installation

Make the script executable and move it into your PATH:

chmod +x dryrun.sh
sudo mv dryrun.sh /usr/local/bin/dryrun

Then you can run it from anywhere:

dryrun <command>

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Requirements

• bash
• shellcheck (optional, for dryrun lint)

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Author

Developed by Siddharth Jain.
Feel free to contribute or suggest improvements.