clig(7)

NAME

::clig::Flag - declare a flag (boolean, classic) option

package require clig
namespace import ::clig::*
setSpec db
Flag -opt varname usage

The Flag command declares an option without any parameters. The command line parser merely checks for the existence of opt on the command line.
tcl: If parseCmdline finds opt on the command line, variable varname in the caller's context is set to 1. If opt is not on the command line, the variable is not set.
C: If opt is found on the command line the slot variableP in the structure returned by the parser will be set to a non-zero value, otherwise it will be 0.; Example use of Flag:

Flag -v verbose {verbose operation}