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knife-xargs - The man page for the knife xargs subcommand.

The knife xargs subcommand is used to take patterns from standard input, download as JSON,
run a command against the downloaded JSON, and then upload any changes.


This subcommand has the following syntax:

$ knife xargs [PATTERN...] (options)


This subcommand has the following options:

-0 Use to show a NULL character (\0) instead of white space as the separator. Default:

--chef-repo-path PATH
The path to the chef-repo. This setting will override the default path to the
chef-repo. Default: same as specified by chef_repo_path in config.rb.

The number of allowed concurrent connections. Default: 10.

Use to show a diff when a file changes. Default: --diff.

Use to prevent changes from being uploaded to the Chef server. Default: false.

Use to force the upload of files even if they haven't been changed. Default:

Use to define a string that will be used to replace all occurrences of a file name.
Default: nil.

Use to define a string that will be used to replace the first occurrence of a file
name. Default: nil.

Use to build or execute a command line against a local file. Set to false to build
or execute against a remote file. Default: false.

-n MAX_ARGS, --max-args MAX_ARGS
The maximum number of arguments per command line. Default: nil.

-p [PATTERN...], --pattern [PATTERN...]
One (or more) patterns for a command line. If this option is not specified, a list
of patterns may be expected on standard input. Default: nil.

--repo-mode MODE
The layout of the local chef-repo. Possible values: static, everything, or
hosted_everything. Use static for just roles, environments, cookbooks, and data
bags. By default, everything and hosted_everything are dynamically selected
depending on the server type. Default value: default.

-s LENGTH, --max-chars LENGTH
The maximum size (in characters) for a command line. Default: nil.

-t Use to run the print command on the command line. Default: nil.

The configuration file to use.

--chef-zero-port PORT
The port on which chef-zero will listen.

-d, --disable-editing
Use to prevent the $EDITOR from being opened and to accept data as-is.

Use to have knife use the default value instead of asking a user to provide one.

-e EDITOR, --editor EDITOR
The $EDITOR that is used for all interactive commands.

The name of the environment. When this option is added to a command, the command
will run only against the named environment.

-F FORMAT, --format FORMAT
The output format: summary (default), text, json, yaml, and pp.

-h, --help
Shows help for the command.

-k KEY, --key KEY
The private key that knife will use to sign requests made by the API client to the
Chef server.

Use to view colored output.

Use to show data after a destructive operation.

--server-url URL
The URL for the Chef server.

-u USER, --user USER
The user name used by knife to sign requests made by the API client to the Chef
server. Authentication will fail if the user name does not match the private key.

-v, --version
The version of the chef-client.

-V, --verbose
Set for more verbose outputs. Use -VV for maximum verbosity.

-y, --yes
Use to respond to all confirmation prompts with "Yes". knife will not ask for

-z, --local-mode
Use to run the chef-client in local mode. This allows all commands that work
against the Chef server to also work against the local chef-repo.


The following examples show various ways of listing all nodes on the server, and then
using Perl to replace grantmc with gmc:

$ knife list 'nodes/*' | knife xargs "perl -i -pe 's/grantmc/gmc'"

or without quotes and the backslash escaped:

$ knife list /nodes/\* | knife xargs "perl -i -pe 's/grantmc/gmc'"

or by using the --pattern option:

$ knife xargs --pattern '/nodes.*' "perl -i -pe 's/grantmc/gmc'"

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