sudo -u www-data php occ #以www-data用户身份执行OCC文件
会输出以下内容（以Nextcloud为例）：
Nextcloud version 11.0.1
Usage:
command [options] [arguments]
Options:
-h, --help Display this help message
-q, --quiet Do not output any message
-V, --version Display this application version
--ansi Force ANSI output
--no-ansi Disable ANSI output
-n, --no-interaction Do not ask any interactive question
--no-warnings Skip global warnings, show command output only
-v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
Available commands:
_completion BASH completion hook.
check check dependencies of the server environment
help Displays help for a command
list Lists commands
status show some status information
upgrade run upgrade routines after installation of a new release. The release has to be installed before.
app
app:check-code check code to be compliant
app:disable disable an app
app:enable enable an app
app:getpath Get an absolute path to the app directory
app:list List all available apps
background
background:ajax Use ajax to run background jobs
background:cron Use cron to run background jobs
background:webcron Use webcron to run background jobs
config
config:app:delete Delete an app config value
config:app:get Get an app config value
config:app:set Set an app config value
config:import Import a list of configs
config:list List all configs
config:system:delete Delete a system config value
config:system:get Get a system config value
config:system:set Set a system config value
dav
dav:create-addressbook Create a dav addressbook
dav:create-calendar Create a dav calendar
dav:sync-birthday-calendar Synchronizes the birthday calendar
dav:sync-system-addressbook Synchronizes users to the system addressbook
db
db:convert-type Convert the Nextcloud database to the newly configured one
db:generate-change-script generates the change script from the current connected db to db_structure.xml
encryption
encryption:change-key-storage-root Change key storage root
encryption:decrypt-all Disable server-side encryption and decrypt all files
encryption:disable Disable encryption
encryption:enable Enable encryption
encryption:encrypt-all Encrypt all files for all users
encryption:list-modules List all available encryption modules
encryption:set-default-module Set the encryption default module
encryption:show-key-storage-root Show current key storage root
encryption:status Lists the current status of encryption
federation
federation:sync-addressbooks Synchronizes addressbooks of all federated clouds
files
files:cleanup cleanup filecache
files:scan rescan filesystem
files:transfer-ownership All files and folders are moved to another user - shares are moved as well.
files_external
files_external:applicable Manage applicable users and groups for a mount
files_external:backends Show available authentication and storage backends
files_external:config Manage backend configuration for a mount
files_external:create Create a new mount configuration
files_external:delete Delete an external mount
files_external:export Export mount configurations
files_external:import Import mount configurations
files_external:list List configured admin or personal mounts
files_external:notify Listen for active update notifications for a configured external mount
files_external:option Manage mount options for a mount
files_external:verify Verify mount configuration
group
group:adduser add a user to a group
group:list list configured groups
group:removeuser remove a user from a group
integrity
integrity:check-app Check integrity of an app using a signature.
integrity:check-core Check integrity of core code using a signature.
integrity:sign-app Signs an app using a private key.
integrity:sign-core Sign core using a private key.
l10n
l10n:createjs Create javascript translation files for a given app
log
log:file manipulate logging backend
log:manage manage logging configuration
maintenance
maintenance:data-fingerprint update the systems data-fingerprint after a backup is restored
maintenance:mimetype:update-db Update database mimetypes and update filecache
maintenance:mimetype:update-js Update mimetypelist.js
maintenance:mode set maintenance mode
maintenance:repair repair this installation
maintenance:singleuser set single user mode
maintenance:update:htaccess Updates the .htaccess file
security
security:certificates list trusted certificates
security:certificates:import import trusted certificate
security:certificates:remove remove trusted certificate
trashbin
trashbin:cleanup Remove deleted files
trashbin:expire Expires the users trashbin
twofactorauth
twofactorauth:disable Disable two-factor authentication for a user
twofactorauth:enable Enable two-factor authentication for a user
user
user:add adds a user
user:delete deletes the specified user
user:disable disables the specified user
user:enable enables the specified user
user:info show user info
user:lastseen shows when the user was logged in last time
user:list list configured users
user:report shows how many users have access
user:resetpassword Resets the password of the named user
user:setting Read and modify user settings
versions
versions:cleanup Delete versions
versions:expire Expires the users file versions
在CentOS中，命令是这样的：
sudo -u apache php occ
区别就是Ubuntu和CentOS的http服务器用户不同
使用它！
1，遇到一个新命令行工具，我们首先要help一下。
sudo -u www-data php occ -h
输出如下
Usage:
help [options] [--] [<command_name>] #格式：help [选项] [--] [命令名]
Arguments:
command The command to execute
command_name The command name [default: "help"] #命令名（对应使用格式中的“命令名”）
Options: #选项
--format=FORMAT The output format (txt, xml, json, or md) [default: "txt"] #输出格式，默认为txt，下文中有讲
--raw To output raw command help #输出原始命令帮助
-h, --help Display this help message #显示帮助信息
-q, --quiet Do not output any message #不输出任何信息
-V, --version Display this application version #显示程序版本
--ansi Force ANSI output #强制使用ANSI格式输出
--no-ansi Disable ANSI output #禁用ANSI输出
-n, --no-interaction Do not ask any interactive question #不要询问任何问题（所有选项默认，大概这个意思）
--no-warnings Skip global warnings, show command output only #跳过错误信息
-v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
# 增加消息的详细程度：1用于正常输出，2用于更详细的输出，3用于调试
Help:
The help command displays help for a given command: #详细地，查看一个命令的使用方法，例如：
php occ help list
You can also output the help in other formats by using the --format option:
php occ help --format=xml list
To display the list of available commands, please use the list command.
使用-h选项获取一个命令的详细信息，比如我要查询maintenance:mode（维护模式）命令的使用方式
输入
sudo -u www-data php occ help maintenance:mode
Usage:
maintenance:mode [options] #格式： maintenance:mode+选项（即maintenance:mode后面跟选项）
Options: #选项（对应上面格式中的“选项”）
--on enable maintenance mode #激活维护模式
--off disable maintenance mode #关闭维护模式
-h, --help Display this help message #显示帮助信息，即本段信息
-q, --quiet Do not output any message #不输出任何信息
-V, --version Display this application version
--ansi Force ANSI output
--no-ansi Disable ANSI output
-n, --no-interaction Do not ask any interactive question
--no-warnings Skip global warnings, show command output only
-v|vv|vvv, --verbose Increase the verbosity of messages: 1 for normal output,
2 for more verbose output and 3 for debug
2.显示ownCloud/Nextcloud版本
以Ubuntu、Nextcloud为例
sudo -u www-data php occ -V #选项为-V，注意大写 Nextcloud version 9.0.0 #Nextcloud版本为 9.0.0
3.查询您的Nextcloud服务器状态
sudo -u www-data php occ status - installed: true #安装状态：已安装 - version: 9.0.0.19 #版本：9.0.0.19 - versionstring: 9.0.0 #版本串：9.0.0 - edition: #发行版本，社区版不显示，企业版可能会显示
4.命令输出格式，可以输出txt, xml, json或 md格式的信息
比如以json格式输出服务器状态信息：
sudo -u www-data php occ status --output=json
{"installed":true,"version":"9.0.0.19","versionstring":"9.0.0","edition":""}
或者以json_pretty格式输出：
sudo -u www-data php occ status --output=json_pretty
{
"installed": true,
"version": "9.0.0.19",
"versionstring": "9.0.0",
"edition": ""
}
（这样，OCC命令可以作为一个API来使用）
5.命令自动补全
Nextcloud11后，OCC命令可以使用自动补全命令，你需要以下命令来设置自动补全
# BASH ~4.x, ZSH source <(/var/www/html/nextcloud/occ _completion --generate-hook) # BASH ~3.x, ZSH /var/www/html/nextcloud/occ _completion --generate-hook | source /dev/stdin # BASH (any version) eval $(/var/www/html/nextcloud/occ _completion --generate-hook)
设置后，只有提供OCC文件完整目录（比如/var/www/html/nextcloud/occ <tab>）才能使用自动补全。在–generate-hook之后指定–programm occ，便可无需在写完整目录。
这样，当你使用OCC命令行工具时，按下Tab键便可自动补全剩余的命令内容。
例如
输入 sudo -u www-data php occ sta 按Tab键，命令自动补全为： sudo -u www-data php occ status
插件（APP）管理命令
使用以下命令列出、激活禁用插件
app app:check-code check code to be compliant #检查代码是否合法 app:disable disable an app #禁用一个插件（app） app:enable enable an app #激活一个插件 app:getpath Get an absolute path to the app directory #获取应用程序目录的绝对路径 app:list List all available apps #列出所有可用的插件
命令示例：
sudo -u www-data php occ app:list Enabled: - activity: 2.4.1 - comments: 1.1.0 - dav: 1.1.1 - direct_menu: 0.10.0 - federatedfilesharing: 1.1.1 - federation: 1.1.1 - files: 1.6.1 - files_external: 1.1.2 - files_markdown: 1.0.0 - files_pdfviewer: 1.0.1 - files_sharing: 1.1.1 - files_texteditor: 2.2 - files_trashbin: 1.1.0 - files_versions: 1.4.0 - files_videoplayer: 1.0.0 - firstrunwizard: 2.0 - gallery: 16.0.0 - logreader: 2.0.0 - lookup_server_connector: 1.0.0 - nextcloud_announcements: 1.0 - notifications: 1.0.1 - password_policy: 1.1.0 - provisioning_api: 1.1.0 - serverinfo: 1.1.1 - sharebymail: 1.0.1 - survey_client: 0.1.5 - systemtags: 1.1.3 - theming: 1.1.1 - twofactor_backupcodes: 1.0.0 - updatenotification: 1.1.1 - user_saml: 1.2.2 - workflowengine: 1.1.1 Disabled: - admin_audit - encryption - external - files_accesscontrol - files_automatedtagging - files_retention - spreed - spreedme - templateeditor - user_external - user_ldap
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