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-rw-r--r--pullimap.md9
1 files changed, 6 insertions, 3 deletions
diff --git a/pullimap.md b/pullimap.md
index a367dd1..72418aa 100644
--- a/pullimap.md
+++ b/pullimap.md
@@ -131,8 +131,9 @@ Valid options are:
: One of `imap`, `imaps` or `tunnel`.
`type=imap` and `type=imaps` are respectively used for IMAP and IMAP
over SSL/TLS connections over a INET socket.
- `type=tunnel` causes `pullimap` to open a pipe to a *command*
- instead of a raw socket.
+ `type=tunnel` causes `pullimap` to create an unnamed pair of
+ connected sockets for interprocess communication with a *command*
+ instead of a opening a network socket.
(Default: `imaps`.)
*host*
@@ -160,7 +161,9 @@ Valid options are:
: Command to use for `type=tunnel`. Must speak the [IMAP4rev1
protocol][RFC 3501] on its standard output, and understand it on its
- standard input.
+ standard input. The value is passed to `` `/bin/sh -c` `` if it
+ contains shell metacharacters; otherwise it is split into words and
+ the list is passed to `execvp`(3).
*STARTTLS*