Writing Terminal Commands

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Supported Shells

• Bash
• Sh
• Zsh

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Command Format

# Single command
command --flag value

# Multi-line command
command1 && \
  command2 | \
  grep 'pattern'

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Examples

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Basic Command

# Get system uptime
uptime

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Piped Commands

# Find and count Java processes
ps aux | grep java | wc -l

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Environment Variables

# Use environment variables
echo "Current user is $USER"

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Best Practices

• Keep commands simple and focused
• Use full paths to binaries when possible
• Handle errors with || operator
• Use set -e at the start of scripts to fail fast

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Security Considerations

• Avoid using root privileges unless necessary
• Never include sensitive data directly in commands
• Use environment variables for secrets
• Validate all user inputs