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#### 2.4.8 Diary and Echo Commands

Octave’s diary feature allows you to keep a log of all or part of an interactive session by recording the input you type and the output that Octave produces in a separate file.

Command: diary
Command: diary on
Command: diary off
Command: diary filename

  Record a list of all commands and the output they produce, mixed together just as they appear on the terminal.

  Valid options are:

  on

    Start recording a session in a file called `diary` in the current working directory.

  off

    Stop recording the session in the diary file.

  filename

    Record the session in the file named filename.

  With no arguments, `diary` toggles the current diary state.

  See also: history.

Sometimes it is useful to see the commands in a function or script as they are being evaluated. This can be especially helpful for debugging some kinds of problems.

Command: echo options

  Control whether commands are displayed as they are executed. Valid options are:

  `on`

    Enable echoing of commands as they are executed in script files.

  `off`

    Disable echoing of commands as they are executed in script files.

  `on all`

    Enable echoing of commands as they are executed in script files and functions.

  `off all`

    Disable echoing of commands as they are executed in script files and functions.

  With no arguments, `echo` toggles the current echo state.

Built-in Function: val = echo_executing_commands ()
Built-in Function: old_val = echo_executing_commands (new_val)
Built-in Function: echo_executing_commands (new_val, "local")

  Query or set the internal variable that controls the echo state. It may be the sum of the following values:

  1

    Echo commands read from script files.

  2

    Echo commands from functions.

  4

    Echo commands read from command line.

  More than one state can be active at once. For example, a value of 3 is equivalent to the command `echo on all`.

  The value of `echo_executing_commands` may be set by the `echo` command or the command line option `--echo-commands`.

  When called from inside a function with the `"local"` option, the variable is changed locally for the function and any subroutines it calls. The original variable value is restored when exiting the function.

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