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docs: clarify how to pass arguments using backup --stdin-from-command
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@ -584,11 +584,13 @@ Reading data from a command
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Sometimes, it can be useful to directly save the output of a program, for example,
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``mysqldump`` so that the SQL can later be restored. Restic supports this mode
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of operation; just supply the option ``--stdin-from-command`` when using the
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``backup`` action, and write the command in place of the files/directories:
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``backup`` action, and write the command in place of the files/directories. To prevent
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restic from interpreting the arguments for the commmand, make sure to add ``--`` before
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the command starts:
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.. code-block:: console
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$ restic -r /srv/restic-repo backup --stdin-from-command mysqldump [...]
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$ restic -r /srv/restic-repo backup --stdin-from-command -- mysqldump --host example mydb [...]
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This command creates a new snapshot based on the standard output of ``mysqldump``.
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By default, the command's standard output is saved in a file named ``stdin``.
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@ -596,7 +598,7 @@ A different name can be specified with ``--stdin-filename``:
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.. code-block:: console
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$ restic -r /srv/restic-repo backup --stdin-filename production.sql --stdin-from-command mysqldump [...]
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$ restic -r /srv/restic-repo backup --stdin-filename production.sql --stdin-from-command -- mysqldump --host example mydb [...]
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Restic uses the command exit code to determine whether the command succeeded. A
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non-zero exit code from the command causes restic to cancel the backup. This causes
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