# Functions
EnvAppendValue combines command line and environment var into a single argument.
EnvSetValue set flag value if CLI option/argument is unset and env var is set.
NewCommandManager instantiates a CommandManager.
# Structs
CommandManager holds root command or first parent can stores group of command.
Flag holds information about a command flag.
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# Type aliases
CommandError represents a command error type.
EnvHandler defines an environment handler type to set flag's values from environment variables.
FlagError represents a flag error type.