System Commands

These commands allow the format to interact with the external environment or retrieve system-level information.

date - Current Date

Returns the current system date.

• Syntax: date
• Format: Returns YYYYMMDD h:m:s (varies by implementation).

Example:

"Report generated on: ", date

getenv - Get Environment Variable

Retrieves the value of an operating system environment variable.

• Syntax: getenv('VAR_NAME')

Example:

"Server Name: ", getenv('SERVER_NAME')

system - System Call

Executes an external operating system command. Use with caution.

• Syntax: system('command')
• Returns: The exit code of the command (0 usually means success).

Example:

/* Listing files in Linux */
system('ls -l')