jrw32982 This is the only way I've found that works on a plain vanilla tcl 8.4 to detect if stdin is set to a terminal or a file/pipe/socket

set interactive [ expr ! [ catch { exec /bin/sh -c { [ -t 0 ] }}]]

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RFox - 2013-05-29 11:13:27

What about checking the value of tcl_interactive?

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jrw32982 tcl_interactive doesn't tell you if you're running interactively (if your script can receive input from a terminal). It tells you if you're running a script.

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PYK 2015-03-12: AMG and others have suggested variations on

catch {fconfigure stdout -mode}

or

catch {fconfigure stdout -xchar}

See Also  edit

SQLite checkin 559835e5

The source for the information on the page.

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