A command line runs as its own command pane unless it is clicked at a shell's prompt

A middle click, an exec write or a tag word that no builtin knows was typed
into some terminal for the pane's directory, sharing whatever state that
shell was in and answering nothing, so a misspelling vanished into a shell.
Now only a line clicked at an interactive terminal's prompt is typed there.
From anywhere else it runs as a command pane: a terminal whose child is
$SHELL -c the line in the pane's directory, full emulation, which shows its
output and then exit N from the host's reaping of the child, and stays. A
finished command pane is the next command's for its directory, which runs
below what it showed after a '% line' line (acme appends to +Errors and never
clears it, util.c:213); a running one gets a second pane. Kill ends a command
pane's whole process group, the log records run and exit, exec reads back the
command pane's serial, and a line is at most 1 KB, read off the pane as the
host forks rather than carried in every spawn effect. ttyForDir's search for
a free shell is gone. The goldens of chordcut, cmdword and layout-open change
where a file's exec now opens a command pane, and ttytaken is rewritten to
exec from the terminal itself; docs/open-questions.md records the decision.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/fs-help.txt b/src/fs-help.txt
index 7e869f9e..0e87f40e 100644
--- a/src/fs-help.txt
+++ b/src/fs-help.txt
@@ -39,7 +39,7 @@ Pitfalls, one each:
   data: > replaces the addr range, : > deletes it, a 2nd > inserts (addr moved); body: > empties all.
   tag reads the path, then its own text; writes append; truncating clears it, default words too.
   A terminal's body is a history snapshot frozen per open; pty/data is the live stream.
-  exec: a word no builtin knows is typed into a terminal in the pane's directory, and not an error.
+  exec: a non-builtin line runs as a command pane ($SHELL -c; exit N shown, logged), a shell's typed in.
   Through a mount a malformed write is EINVAL, a well-formed one that fails EIO: log's err says why.
   lock/unlock on a pane's ctl need a held fd (exec 3>ctl); a lock someone holds fails: retry.
   Closing a column's last pane leaves a +New in its place; Delcol closes the column.