CODEWITHSUNDEEP
ansiblefile-processing
Brian
Brian

Reputation: 13593

How to remove a line after another line in a file with ansible?

My ansible inventory contains a group that has dynamically generated IP addresses.

[asg]
10.15.100.13
10.15.100.14

Is it possible to remove the line after [asg]? (i.e. 10.15.100.13)

The IP addresses in this group refers to the ec2 instances in an auto scaling group.

lineinfile module doesn't have a removeafter option.

I'd like to know if there are other alternative ways to remove the line after [asg].

regexp option doesn't work. Because the IP addresses change frequently.

Upvotes: 2

Views: 6965

Answers (2)

Chris Lam
Chris Lam

Reputation: 3614

Totally possible with replace as long as regexp is supported.

- replace:
    path: /path/to/file
    regexp: '\[asg\]\n[^\n]+' # Matches [asg] and next line
    replace: '[asg]'          # Replace both lines with [asg]

Upvotes: 3

helloV
helloV

Reputation: 52433

I am not sure it is possible using lineinfile or blockinfile, but you can achieve it using sed. WARNING: This solution is not idempotent.

- shell: /bin/sed -i.bak '/\[asg\]/{n;d}' my_inventory_file

The command will delete the line after [asg]. It will automatically create a backup file with .bak extension. Depending on your OS, the path to sed and the arguments may vary. You can refine the regexp further by:

- shell: sed -i.bak '/^\s*\[asg\]\s*$/{n;d}' my_inventory_file

{n;d} or {n;d;} for MacOS - read the line (n)ext to pattern and (d)elete it

Upvotes: 0

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