lttng-clear(1): normalize style and add details

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Change-Id: I50709df27a04bbb5f300c734b9a85ae3a7c311c2
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/doc/man/lttng-clear.1.txt b/doc/man/lttng-clear.1.txt
index 8b63d6c0c54a8d4c11c0c187232fdac634e38881..6a84ae08465b6baa047a5bccc7d12406c487a0e8 100644 (file)
--- a/doc/man/lttng-clear.1.txt
+++ b/doc/man/lttng-clear.1.txt
@@ -1,6 +1,6 @@
 lttng-clear(1)
 ===============
-:revdate: 6 November 2019
+:revdate: 2 April 2020
 
 NAME
 ----
@@ -10,12 +10,14 @@ lttng-clear - Clear a tracing session
 SYNOPSIS
 --------
 [verse]
-*lttng* ['linkgenoptions:(GENERAL OPTIONS)'] *clear* [option:--all | 'SESSION']
+*lttng* ['linkgenoptions:(GENERAL OPTIONS)'] *clear* ['SESSION' | option:--all]
 
 
 DESCRIPTION
 -----------
-The `lttng clear` command clears one or more tracing sessions.
+The `lttng clear` command clears one or more tracing sessions, that is,
+it deletes the contents of their tracing buffers and all their local and
+streamed trace data.
 
 If no options are specified, the current tracing session is cleared
 (see man:lttng-create(1) for more information about the current
@@ -24,26 +26,34 @@ tracing session).
 If 'SESSION' is specified, the existing tracing session named 'SESSION'
 is cleared.
 
-If the option:--all option is used, *all* the tracing sessions, as listed
-in the output of `lttng list`, are cleared.
+With the option:--all option, *all* the tracing sessions, as listed in
+the output of `lttng list` (see man:lttng-list(1)), are cleared.
 
-Clearing a tracing session deletes the contents of the tracing buffers and
-all local or streamed trace data.
+If a tracing session is configured in snapshot mode (see the
+man:lttng-create(1) command's nloption:--snapshot option), only the
+tracing buffers are cleared.
 
-If a session is configured in snapshot mode, only the tracing buffers are cleared.
+For a given tracing session, if at least one rotation occurred (see
+man:lttng-rotate(1)), only its tracing buffers and its current trace
+chunk are cleared; its archived trace chunks are :not: cleared.
 
-If at least one rotation occurred, only the tracing buffers and the current
-trace chunks are cleared. Previous trace chunks are not cleared.
+NOTE: The nloption:--disallow-clear option and the
+`LTTNG_RELAYD_DISALLOW_CLEAR` environment variable of
+man:lttng-relayd(8) can disable remote clearing operations. If LTTng
+sends tracing data over the network for 'SESSION' (or for any tracing
+session with the option:--all option) to a relay daemon configured as
+such, `lttng clear` fails.
 
-Note that a lttng-relayd daemon can be configured to disallow clear operations
-using LTTNG_RELAYD_DISALLOW_CLEAR. Clear commands performed on a streaming
-session utilizing such lttng-relayd daemon will fail.
 
 include::common-cmd-options-head.txt[]
 
 
+Target
+~~~~~~
 option:-a, option:--all::
-    Clear all tracing sessions.
+    Clear all the tracing sessions instead of the current tracing
+    session or the tracing session named 'SESSION'.
+
 
 include::common-cmd-help-options.txt[]
 
@@ -53,6 +63,8 @@ include::common-cmd-footer.txt[]
 
 SEE ALSO
 --------
+man:lttng-create(1),
 man:lttng-rotate(1),
 man:lttng-set-session(1),
+man:lttng-relayd(8),
 man:lttng(1)