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-rw-r--r--docs/fs.md7
1 files changed, 5 insertions, 2 deletions
diff --git a/docs/fs.md b/docs/fs.md
index 7470bdf3..bcf5dd5b 100644
--- a/docs/fs.md
+++ b/docs/fs.md
@@ -390,8 +390,11 @@ same tree without leaving the process.
the next command there too. The log says `run <serial> <line>` and `exit
<serial> <N|?>`; `exec` reads back the command pane's serial; Kill stops
its whole line, `&` jobs included; a command line is at most 1024 bytes, and a
- longer one written to an exec fails the write (EINVAL, `a command line is
- at most 1024 bytes`) before anything in it runs; a builtin's line (a long
+ longer one written to an exec fails the write (EINVAL, `invalid command
+ line: a command line is at most 1024 bytes`, and one with a control
+ character but a tab, `invalid command line: it holds a control character
+ other than a tab`; the root's exec logs either against the pane it would
+ have run at) before anything in it runs; a builtin's line (a long
`Msg`, an Edit block) may be longer. To run a command again, execute
its line again from its directory: `echo 'make test' > pane/<n>/exec` on
the command pane runs it there, below the last run. A misspelled word is a