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Document availability of self-update command 

The self-update command is only available when running as a PHAR (see
commit 761ad6d171); notably, it is not defined in the Ubuntu package.
pull/9351/head
Lucas Werkmeister 2020-10-26 13:03:24 +01:00 committed by GitHub
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@ -607,6 +607,9 @@ you may have to run the command with `root` privileges
sudo -H composer self-update sudo -H composer self-update
``` ```
If Composer was not installed as a PHAR, this command is not available.
(This is sometimes the case when Composer was installed by an operating system package manager.)
### Options ### Options
* **--rollback (-r):** Rollback to the last version you had installed. * **--rollback (-r):** Rollback to the last version you had installed.