Documentation

lineinfile - Ensure a particular line is in a file, or replace an existing line using a back-referenced regular expression.

Synopsis

  • This module will search a file for a line, and ensure that it is present or absent.
  • This is primarily useful when you want to change a single line in a file only. See the replace module if you want to change multiple, similar lines or check blockinfile if you want to insert/update/remove a block of lines in a file. For other cases, see the copy or template modules.

Options

parameter required default choices comments
attributes
(added in 2.3)
no None
Attributes the file or directory should have. To get supported flags look at the man page for chattr on the target system. This string should contain the attributes in the same order as the one displayed by lsattr.

aliases: attr
backrefs
no no
  • yes
  • no
Used with state=present. If set, line can contain backreferences (both positional and named) that will get populated if the regexp matches. This flag changes the operation of the module slightly; insertbefore and insertafter will be ignored, and if the regexp doesn't match anywhere in the file, the file will be left unchanged. If the regexp does match, the last matching line will be replaced by the expanded line parameter.
backup
no no
  • yes
  • no
Create a backup file including the timestamp information so you can get the original file back if you somehow clobbered it incorrectly.
create
no no
  • yes
  • no
Used with state=present. If specified, the file will be created if it does not already exist. By default it will fail if the file is missing.
group
no
Name of the group that should own the file/directory, as would be fed to chown.
insertafter
no EOF
  • EOF
  • *regex*
Used with state=present. If specified, the line will be inserted after the last match of specified regular expression. A special value is available; EOF for inserting the line at the end of the file. If specified regular expression has no matches, EOF will be used instead. May not be used with backrefs.
insertbefore
no
  • BOF
  • *regex*
Used with state=present. If specified, the line will be inserted before the last match of specified regular expression. A value is available; BOF for inserting the line at the beginning of the file. If specified regular expression has no matches, the line will be inserted at the end of the file. May not be used with backrefs.
line
no
Required for state=present. The line to insert/replace into the file. If backrefs is set, may contain backreferences that will get expanded with the regexp capture groups if the regexp matches.
mode
no
Mode the file or directory should be. For those used to /usr/bin/chmod remember that modes are actually octal numbers (like 0644). Leaving off the leading zero will likely have unexpected results. As of version 1.8, the mode may be specified as a symbolic mode (for example, u+rwx or u=rw,g=r,o=r).
others
no
All arguments accepted by the file module also work here.
owner
no
Name of the user that should own the file/directory, as would be fed to chown.
path
yes
The file to modify.
Before 2.3 this option was only usable as dest, destfile and name.

aliases: dest, destfile, name
regexp
(added in 1.7)
no
The regular expression to look for in every line of the file. For state=present, the pattern to replace if found; only the last line found will be replaced. For state=absent, the pattern of the line to remove. Uses Python regular expressions; see http://docs.python.org/2/library/re.html.
selevel
no s0
Level part of the SELinux file context. This is the MLS/MCS attribute, sometimes known as the range. _default feature works as for seuser.
serole
no
Role part of SELinux file context, _default feature works as for seuser.
setype
no
Type part of SELinux file context, _default feature works as for seuser.
seuser
no
User part of SELinux file context. Will default to system policy, if applicable. If set to _default, it will use the user portion of the policy if available.
state
no present
  • present
  • absent
Whether the line should be there or not.
unsafe_writes
(added in 2.2)
no
Normally this module uses atomic operations to prevent data corruption or inconsistent reads from the target files, sometimes systems are configured or just broken in ways that prevent this. One example are docker mounted files, they cannot be updated atomically and can only be done in an unsafe manner.
This boolean option allows ansible to fall back to unsafe methods of updating files for those cases in which you do not have any other choice. Be aware that this is subject to race conditions and can lead to data corruption.
validate
no None
The validation command to run before copying into place. The path to the file to validate is passed in via '%s' which must be present as in the example below. The command is passed securely so shell features like expansion and pipes won't work.

Examples

# Before 2.3, option 'dest', 'destfile' or 'name' was used instead of 'path'
- lineinfile:
    path: /etc/selinux/config
    regexp: '^SELINUX='
    line: 'SELINUX=enforcing'

- lineinfile:
    path: /etc/sudoers
    state: absent
    regexp: '^%wheel'

- lineinfile:
    path: /etc/hosts
    regexp: '^127\.0\.0\.1'
    line: '127.0.0.1 localhost'
    owner: root
    group: root
    mode: 0644

- lineinfile:
    path: /etc/httpd/conf/httpd.conf
    regexp: '^Listen '
    insertafter: '^#Listen '
    line: 'Listen 8080'

- lineinfile:
    path: /etc/services
    regexp: '^# port for http'
    insertbefore: '^www.*80/tcp'
    line: '# port for http by default'

# Add a line to a file if it does not exist, without passing regexp
- lineinfile:
    path: /tmp/testfile
    line: '192.168.1.99 foo.lab.net foo'

# Fully quoted because of the ': ' on the line. See the Gotchas in the YAML docs.
- lineinfile:
    path: /etc/sudoers
    state: present
    regexp: '^%wheel\s'
    line: '%wheel ALL=(ALL) NOPASSWD: ALL'

# Yaml requires escaping backslashes in double quotes but not in single quotes
- lineinfile:
    path: /opt/jboss-as/bin/standalone.conf
    regexp: '^(.*)Xms(\\d+)m(.*)$'
    line: '\1Xms${xms}m\3'
    backrefs: yes

# Validate the sudoers file before saving
- lineinfile:
    path: /etc/sudoers
    state: present
    regexp: '^%ADMIN ALL='
    line: '%ADMIN ALL=(ALL) NOPASSWD: ALL'
    validate: 'visudo -cf %s'

Notes

Note

  • As of Ansible 2.3, the dest option has been changed to path as default, but dest still works as well.

Status

This module is flagged as preview which means that it is not guaranteed to have a backwards compatible interface.

Support

This module is maintained by those with core commit privileges

For more information on what this means please read Module Support

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