Get output of command that includes many quotes?

[John Oliver]

I want to register a variable with my java version.  I can get that with:

java -version 2>&1 | head -1 | awk 'BEGIN { FS = "\"" } ; { print $2 }'

That gives me the result I want: 1.8.0_45

But I cannot make this happen in ansible :-(  I'm going crazy with quotes and escapes.  I've tried:

  - name: Get java version

    shell: >

         java -version 2>&1 | head -1 | awk 'BEGIN { FS = "\"" } ; { print $2 }'

    register: java_ver

and:

  - name: Get java version

    command: "{{ item }}"

    with_items:

      - java -version 2>&1 | head -1 | awk 'BEGIN { FS = "\"" } ; { print $2 }'

    register: java_ver

as well as trying various combinations of quotes and escape characters.  I just can't get the right recipe.

[Matt Martz]

Because I would rather use jinja2 than piping through a bunch of shell commands:

    - name: Run java -version

      command: java -version

      register: java_version_out

      changed_when: false

    - name: Set java_version var

      set_fact: java_version="{{ java_version_out.stderr.splitlines()[0]|regex_replace('[^\d.]+', '') }}"

    - debug: var=java_version

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Matt Martz
@sivel
sivel.net

[John Oliver]

Nice!  However, your regex is also killing the underscore, and I need that.  I'm starting to monkey around with this, but I just don't know jinja, and I bet you'll have the right magic sauce before I can puzzle it out :-)

Thanks!

[Matt Martz]

You can add the underscore to the list of allowed characters in the regex_replace:

regex_replace('[^\d_.]+', '')

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