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---
module: command
short_description: Execute commands on targets
version_added: historical
description:
- The C(command) module takes the command name followed by a list of space-delimited arguments.
- The given command will be executed on all selected nodes.
- The command(s) will not be
processed through the shell, so variables like C($HOME) and operations
like C("<"), C(">"), C("|"), C(";") and C("&") will not work.
Use the M(shell) module if you need these features.
- To create C(command) tasks that are easier to read than the ones using space-delimited
arguments, pass parameters using the C(args) L(task keyword,../reference_appendices/playbooks_keywords.html#task)
or use C(cmd) parameter.
- Either a free form command or C(cmd) parameter is required, see the examples.
- For Windows targets, use the M(win_command) module instead.
options:
free_form:
description:
- The command module takes a free form command to run.
- There is no actual parameter named 'free form'.
cmd:
type: str
description:
- The command to run.
argv:
type: list
description:
- Passes the command as a list rather than a string.
- Use C(argv) to avoid quoting values that would otherwise be interpreted incorrectly (for example "user name").
- Only the string or the list form can be
provided, not both. One or the other must be provided.
version_added: "2.6"
creates:
type: path
description:
- A filename or (since 2.0) glob pattern. If it already exists, this step B(won't) be run.
removes:
type: path
description:
- A filename or (since 2.0) glob pattern. If it already exists, this step B(will) be run.
version_added: "0.8"
chdir:
type: path
description:
- Change into this directory before running the command.
version_added: "0.6"
warn:
description:
- Enable or disable task warnings.
type: bool
default: yes
version_added: "1.8"
stdin:
description:
- Set the stdin of the command directly to the specified value.
version_added: "2.4"
stdin_add_newline:
type: bool
default: yes
description:
- If set to C(yes), append a newline to stdin data.
version_added: "2.8"
strip_empty_ends:
description:
- Strip empty lines from the end of stdout/stderr in result.
version_added: "2.8"
type: bool
default: yes
notes:
- If you want to run a command through the shell (say you are using C(<), C(>), C(|), etc), you actually want the M(shell) module instead.
Parsing shell metacharacters can lead to unexpected commands being executed if quoting is not done correctly so it is more secure to
use the C(command) module when possible.
- " C(creates), C(removes), and C(chdir) can be specified after the command.
For instance, if you only want to run a command if a certain file does not exist, use this."
- Check mode is supported when passing C(creates) or C(removes). If running in check mode and either of these are specified, the module will
check for the existence of the file and report the correct changed status. If these are not supplied, the task will be skipped.
- The C(executable) parameter is removed since version 2.4. If you have a need for this parameter, use the M(shell) module instead.
- For Windows targets, use the M(win_command) module instead.
- For rebooting systems, use the M(reboot) or M(win_reboot) module.
seealso:
- module: raw
- module: script
- module: shell
- module: win_command
author:
- Ansible Core Team
- Michael DeHaan
s[
- name: return motd to registered var
command: cat /etc/motd
register: mymotd
- name: Run command if /path/to/database does not exist (without 'args' keyword).
command: /usr/bin/make_database.sh db_user db_name creates=/path/to/database
# 'args' is a task keyword, passed at the same level as the module
- name: Run command if /path/to/database does not exist (with 'args' keyword).
command: /usr/bin/make_database.sh db_user db_name
args:
creates: /path/to/database
# 'cmd' is module parameter
- name: Run command if /path/to/database does not exist (with 'cmd' parameter).
command:
cmd: /usr/bin/make_database.sh db_user db_name
creates: /path/to/database
- name: Change the working directory to somedir/ and run the command as db_owner if /path/to/database does not exist.
command: /usr/bin/make_database.sh db_user db_name
become: yes
become_user: db_owner
args:
chdir: somedir/
creates: /path/to/database
# 'argv' is a parameter, indented one level from the module
- name: Use 'argv' to send a command as a list - leave 'command' empty
command:
argv:
- /usr/bin/make_database.sh
- Username with whitespace
- dbname with whitespace
- name: safely use templated variable to run command. Always use the quote filter to avoid injection issues.
command: cat {{ myfile|quote }}
register: myoutput
s
cmd:
description: the cmd that was run on the remote machine
returned: always
type: list
sample:
- echo
- hello
delta:
description: cmd end time - cmd start time
returned: always
type: str
sample: 0:00:00.001529
end:
description: cmd end time
returned: always
type: str
sample: '2017-09-29 22:03:48.084657'
start:
description: cmd start time
returned: always
type: str
sample: '2017-09-29 22:03:48.083128'
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