When standard output is a terminal, this will by default, perform the action corresponding to capname .
Some capabilities also require parameters which are given by arg .
The capabilities must be passed to tput from the standard input instead of from the command line. Only one capname is allowed per line. In this case know boolean capabilities that are not supported by this terminal will not cause a non-zero exit status. Normally this option is unnecessary, because the default is taken from the environment variable TERM . Requested capabilities were written correctly.