Truncate the file behind the given channel at the given location (or the current by default). Operation is (probably) not supported by non-file channels.

chan truncate channelId ?length?

Like the ftruncate() call in C's stdio.

Introduced in Tcl 8.5.

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AMG: For one possible use of this command, see How do I remove one line from a file?.

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AMG: Any plans to add support for [chan truncate] to reflected channels?

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