autojanet/skills/understand/languages/shell.md

Shell Language Prompt Snippet

Key Concepts

• Shebang Line: #!/bin/bash or #!/usr/bin/env bash specifying the interpreter
• Variables: VAR=value assignment, $VAR or ${VAR} expansion, no spaces around =
• Functions: function name() or name() for reusable command groups
• Conditionals: if [[ condition ]]; then ... fi with [[ ]] for extended tests
• Loops: for item in list, while condition, until condition iteration patterns
• Pipes and Redirection: | for chaining commands, > / >> / 2>&1 for output redirection
• Exit Codes: $? captures last command status; set -e exits on any failure
• Strict Mode: set -euo pipefail for robust error handling (exit on error, undefined vars, pipe failures)
• Command Substitution: $(command) captures command output as a string
• Here Documents: <<EOF ... EOF for multi-line string input to commands

Notable File Patterns

• *.sh / *.bash — Shell script files
• scripts/*.sh — Project automation scripts (build, deploy, setup)
• entrypoint.sh — Docker container entry point script
• install.sh / setup.sh — Environment setup scripts
• .bashrc / .bash_profile / .zshrc — Shell configuration files

Edge Patterns

• Shell scripts triggers other scripts or build processes they invoke
• Entry point scripts deploys the application they start
• Setup scripts configures the development environment
• Build scripts depends_on the source files they compile or package

Summary Style

"Build automation script compiling TypeScript, running tests, and packaging the release artifact." "Docker entry point script handling signal forwarding and graceful shutdown." "Environment setup script installing dependencies and configuring development tools."