lttng-crash(1): document the command's positional argument

[lttng-tools.git] / doc / man / lttng-crash.1.txt

diff --git a/doc/man/lttng-crash.1.txt b/doc/man/lttng-crash.1.txt
index b3982d039fa4ebe3741c6a90c8ebbdfa6edc14f7..a8a2c9f4dfaaee1880c76617ea27f1a9f8bb3c37 100644 (file)
--- a/doc/man/lttng-crash.1.txt
+++ b/doc/man/lttng-crash.1.txt
@@ -1,5 +1,6 @@
 lttng-crash(1)
 ==============
+:revdate: 2 April 2020
 
 
 NAME
@@ -10,7 +11,7 @@ lttng-crash - Recover and view LTTng 2 trace buffers in the event of a crash
 SYNOPSIS
 --------
 [verse]
-*lttng-crash* [option:--extract='PATH' | option:--viewer='VIEWER'] [option:-v | option:-vv | option:-vvv]
+*lttng-crash* [option:--extract='PATH' | option:--viewer='VIEWER'] [option:-v | option:-vv | option:-vvv] 'SHMDIR'
 
 
 DESCRIPTION
@@ -22,9 +23,23 @@ user applications, and user libraries.
 LTTng consists of Linux kernel modules (for Linux kernel tracing) and
 dynamically loaded libraries (for user application and library tracing).
 
-The _`lttng-crash`_ command-line tool is used to recover and view
+The `lttng-crash` command-line tool is used to recover and view
 LTTng trace buffers in the event of a system crash.
 
+`lttng-crash` reads files within the directory 'SHMDIR' and does one
+of:
+
+Without the option:--extract option::
+    Launches a trace reader (see the option:--viewer option) to view the
+    recovered traces.
+
+With the option:--extract option::
+    Extracts them as uncorrupted LTTng traces on the file system.
+
+'SHMDIR' is the directory specified as the argument of the
+nloption:--shm-path option of the man:lttng-create(1) command used to
+create the tracing session for which to recover the traces.
+
 
 OPTIONS
 -------
@@ -45,7 +60,8 @@ option:-e 'VIEWER', option:--viewer='VIEWER'::
     command arguments as well. The trace directory paths are passed to
     the 'VIEWER' command as its last arguments.
 +
-Default: `babeltrace`.
+Without this option, `lttng crash` uses man:babeltrace2(1) if it's
+available. Otherwise, it tries to use man:babeltrace(1).
 
 
 Program information
@@ -78,4 +94,4 @@ man:lttng(1),
 man:lttng-sessiond(8),
 man:lttng-relayd(8),
 man:lttng-ust(3),
-man:babeltrace(1)
+man:babeltrace2(1)