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tput displays various error messages if problems occur. In
addition, it exits with one of the following status values:
- 0
-
Normal status; the given capability is present.
- 1
-
The given Boolean or string capability is not present.
- 2
-
Usage error;
tput was given invalid arguments.
- 3
-
The terminal type given (either in the `TERM' environment variable
or by the `-T' switch) is unknown, or the termcap database can not
be read.
- 4
-
The given capability is unknown.
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