# close Close a channel opened with `open`. ## Syntax

[close $chan]

## Parameters - `$chan` — Channel handle returned by `open`. ## Examples

set chan [open "/tmp/log.txt" "w"]
[puts $chan "done"]
[close $chan]                         # => true
[close $chan]                         # => false (already closed)

## Returns `true` if this call closed the channel, `false` if it was already closed. Closing is idempotent. Standard streams (`:stdin`, `:stdout`, `:stderr`) cannot be closed — passing one raises an error. Dropped channels are also closed by the GC, so an explicit `close` is a courtesy rather than a requirement. ## See Also `open`, `gets`, `puts`