# lttng-destroy

## NAME



           lttng-destroy - Destroy an LTTng tracing session
    


## SYNOPSIS



           **lttng**[_GENERAL OPTIONS_] **destroy**[**--no-wait**] [**--all** | _SESSION_]
    


## DESCRIPTION



           The **lttng destroy** command destroys one or more tracing sessions.
    
           If no options are specified, the current tracing session is
           destroyed (see lttng-create(1) for more information about the
           current tracing session).
    
           If _SESSION_ is specified, the existing tracing session named
           _SESSION_ is destroyed. **lttng list** outputs all the existing tracing
           sessions (see lttng-list(1)).
    
           If the **--all** option is used, **all** the tracing sessions, as listed
           in the output of **lttng list** , are destroyed.
    
           Destroying a tracing session stops any tracing running within the
           latter. By default, the implicit lttng-stop(1) command invoked by
           the **lttng destroy** command ensures that the tracing session’s trace
           data is valid before returning. With the **--no-wait** option, the
           lttng-stop(1) command finishes immediately, hence a local trace
           might not be valid when the command is done. In this case, there
           is no way to know when the trace becomes valid.
    
           Destroying a tracing session does not destroy the recorded trace
           data, if any; it frees resources acquired by the session daemon
           and tracer side, making sure to flush all trace data.
    
           If at least one rotation occurred during the chosen tracing
           session’s lifetime (see lttng-rotate(1) and
           lttng-enable-rotation(1)), and without the **--no-wait** option, all
           the tracing session’s output directory’s subdirectories are
           considered trace chunk archives once the command returns: it is
           safe to read them, modify them, move them, or remove them.
    


## OPTIONS



           General options are described in lttng(1).
    
           **-a** , **--all**
               Destroy all tracing sessions.
    
           **-n** , **--no-wait**
               Do not ensure that the chosen tracing session’s trace data is
               valid before returning to the prompt.
    
       **Program information**
           **-h** , **--help**
               Show command help.
    
               This option, like lttng-help(1), attempts to launch
               **/usr/bin/man** to view the command’s man page. The path to the
               man pager can be overridden by the **LTTNG_MAN_BIN_PATH**
               environment variable.
    
           **--list-options**
               List available command options.
    


## ENVIRONMENT VARIABLES



           **LTTNG_ABORT_ON_ERROR**
               Set to 1 to abort the process after the first error is
               encountered.
    
           **LTTNG_HOME**
               Overrides the **$HOME** environment variable. Useful when the user
               running the commands has a non-writable home directory.
    
           **LTTNG_MAN_BIN_PATH**
               Absolute path to the man pager to use for viewing help
               information about LTTng commands (using lttng-help(1) or **lttng**
               **COMMAND --help**).
    
           **LTTNG_SESSION_CONFIG_XSD_PATH**
               Path in which the **session.xsd** session configuration XML schema
               may be found.
    
           **LTTNG_SESSIOND_PATH**
               Full session daemon binary path.
    
               The **--sessiond-path** option has precedence over this
               environment variable.
    
           Note that the lttng-create(1) command can spawn an LTTng session
           daemon automatically if none is running. See lttng-sessiond(8) for
           the environment variables influencing the execution of the session
           daemon.
    


## FILES



           **$LTTNG_HOME/.lttngrc**
               User LTTng runtime configuration.
    
               This is where the per-user current tracing session is stored
               between executions of lttng(1). The current tracing session
               can be set with lttng-set-session(1). See lttng-create(1) for
               more information about tracing sessions.
    
           **$LTTNG_HOME/lttng-traces**
               Default output directory of LTTng traces. This can be
               overridden with the **--output** option of the lttng-create(1)
               command.
    
           **$LTTNG_HOME/.lttng**
               User LTTng runtime and configuration directory.
    
           **$LTTNG_HOME/.lttng/sessions**
               Default location of saved user tracing sessions (see
               lttng-save(1) and lttng-load(1)).
    
           **/usr/local/etc/lttng/sessions**
               System-wide location of saved tracing sessions (see
               lttng-save(1) and lttng-load(1)).
    
               **Note**
    
               **$LTTNG_HOME** defaults to **$HOME** when not explicitly set.
    


## EXIT STATUS



           **0**
               Success
    
           **1**
               Command error
    
           **2**
               Undefined command
    
           **3**
               Fatal error
    
           **4**
               Command warning (something went wrong during the command)
    


## BUGS



           If you encounter any issue or usability problem, please report it
           on the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-
           tools>.
    


## RESOURCES



           •   LTTng project website <https://lttng.org>
    
           •   LTTng documentation <https://lttng.org/docs>
    
           •   Git repositories <http://git.lttng.org>
    
           •   GitHub organization <http://github.com/lttng>
    
           •   Continuous integration <http://ci.lttng.org/>
    
           •   Mailing list <http://lists.lttng.org> for support and
               development: **lttng-dev@lists.lttng.org**
    
           •   IRC channel <irc://irc.oftc.net/lttng>: **#lttng** on **irc.oftc.net**
    


## THANKS



           Special thanks to Michel Dagenais and the DORSAL laboratory
           <http://www.dorsal.polymtl.ca/> at École Polytechnique de Montréal
           for the LTTng journey.
    
           Also thanks to the Ericsson teams working on tracing which helped
           us greatly with detailed bug reports and unusual test cases.
    


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