augtool(1) inspect and modify configuration files




Augeas is a configuration editing tool. It parses configuration files in their native formats and transforms them into a tree. Configuration changes are made by manipulating this tree and saving it back into native config files.

augtool provides a command line interface to the generated tree. COMMAND can be a single command as described under ``COMMANDS''. When called with no COMMAND, it reads commands from standard input until an end-of-file is encountered.


-c, --typecheck
Typecheck lenses. This can be very slow, and is therefore not done by default, but is highly recommended during development.
-b, --backup
When files are changed, preserve the originals in a file with extension '.augsave'
-n, --new
Save changes in files with extension '.augnew', do not modify the original files
-r, --root=ROOT
Use directory ROOT as the root of the filesystem. Takes precedence over a root set with the AUGEAS_ROOT environment variable.
-I, --include=DIR
Add DIR to the module loadpath. Can be given multiple times. The directories set here are searched before any directories specified in the AUGEAS_LENS_LIB environment variable, and before the default directories /usr/share/augeas/lenses and /usr/share/augeas/lenses/dist.
-t, --transform=XFM
Add a file transform; uses the 'transform' command syntax, e.g. "-t 'Fstab incl /etc/fstab.bak'".
-f, --file=FILE
Read commands from FILE.
-i, --interactive
Read commands from the terminal. When combined with -f or redirection of stdin, drop into an interactive session after executing the commands from the file.
-e, --echo
When reading commands from a file via stdin, echo the commands before printing their output.
-s, --autosave
Automatically save all changes at the end of the session.
-S, --nostdinc
Do not search any of the default directories for modules. When this option is set, only directories specified explicitly with -I or specified in AUGEAS_LENS_LIB will be searched for modules.
-L, --noload
Do not load any files on startup. This is generally used to fine-tune which files to load by modifying the entries in "/augeas/load" and then issuing a "load" command.
-A, --noautoload
Do not load any lens modules, and therefore no files, on startup. This creates no entries under "/augeas/load" whatsoever; to read any files, they need to be set up manually and loading must be initiated with a "load" command. Using this option gives the fastest startup.
Print version information and exit. The version is also in the tree under "/augeas/version".


In interactive mode, commands and paths can be completed by pressing "TAB".

The paths accepted as arguments by commands use a small subset of XPath path expressions. A path expression consists of a number of segments, separated by "/". In each segment, the character "*" can be used to match every node regardless of its label. Sibling nodes with identical labels can be distinguished by appending "[N]" to their label to match the N-th sibling with such a label. The last sibling with a specific label can be reached as "[last()]". See ``EXAMPLES'' for some examples of this.

Exit the program
ls <PATH>
List the direct children of PATH
match <PATTERN> [<VALUE>]
Find all paths that match PATTERN. If VALUE is given, only the matching paths whose value equals VALUE are printed
rm <PATH>
Delete PATH and all its children from the tree
mv <SRC> <DST>
Move node SRC to DST. SRC must match exactly one node in the tree. DST must either match exactly one node in the tree, or may not exist yet. If DST exists already, it and all its descendants are deleted. If DST does not exist yet, it and all its missing ancestors are created.
set <PATH> <VALUE>
Associate VALUE with PATH. If PATH is not in the tree yet, it and all its ancestors will be created.
clear <PATH>
Set the value for PATH to NULL. If PATH is not in the tree yet, it and all its ancestors will be created.
setm <BASE> <SUB> <VALUE>
Set multiple nodes in one operation. Find or create a node matching SUB by interpreting SUB as a path expression relative to each node matching BASE. If SUB is '.', the nodes matching BASE will be modified.
get <PATH>
Print the value associated with PATH
print [<PATH>]
Print entries in the tree. If PATH is given, printing starts there, otherwise the whole tree is printed
dump-xml [<PATH>] [<FILENAME>]
Print entries in the tree as XML. If PATH is given, printing starts there, otherwise the whole tree is printed. If FILENAME is given, the XML is saved to the given file.
Insert a new node with label LABEL right before or after PATH into the tree. WHERE must be either 'before' or 'after'.
Save all pending changes to disk. Unless either the -b or -n command line options are given, files are changed in place.
Load files according to the transforms in "/augeas/load".
defvar <NAME> <EXPR>
Define the variable NAME to the result of evaluating EXPR. The variable can be used in path expressions as $NAME. Note that EXPR is evaluated when the variable is defined, not when it is used.
defnode <NAME> <EXPR> [<VALUE>]
Define the variable NAME to the result of evaluating EXPR, which must be a nodeset. If no node matching EXPR exists yet, one is created and NAME will refer to it. If VALUE is given, this is the same as 'set EXPR VALUE'; if VALUE is not given, the node is created as if with 'clear EXPR' would and NAME refers to that node.
span <PATH>
Print the name of the file from which the node PATH was generated, as well as information about the positions in the file corresponding to the label, the value, and the entire node. PATH must match exactly one node.

You need to run 'set /augeas/span enable' prior to loading files to enable recording of span information. It is disabled by default.

Print this help text


The file system root, defaults to '/'. Can be overridden with the -r command line option
Colon separated list of directories with lenses. Directories specified here are searched after any directories set with the -I command line option, but before the default directories /usr/share/augeas/lenses and /usr/share/augeas/lenses/dist


Normally, exit status is 0. If one or more commands fail, the exit status is set to a non-zero value.

Note though that failure to load some of the files specified by transforms in "/augeas/load" is not considered a failure. If it is important to know that all files were loaded, you need to issue a "match /augeas//error" after loading to find out details about what files could not be loaded and why.


  # command line mode
  augtool print /files/etc/hosts/
  # interactive mode
  augtool> help
  augtool> print /files/etc/hosts/
  # Print the third entry from the second AcceptEnv line
  augtool print '/files/etc/ssh/sshd_config/AcceptEnv[2]/3'
  # Find the entry in inittab with action 'initdefault'
  augtool> match /files/etc/inittab/*/action initdefault
  # Print the last alias for each entry in /etc/hosts
  augtool> print /files/etc/hosts/*/alias[last()]


Lenses and schema definitions in /usr/share/augeas/lenses and /usr/share/augeas/lenses/dist


  David Lutterkort <[email protected]>


Copyright 2007-2012 Red Hat Inc.

Augeas (and augtool) are distributed under the GNU Lesser General Public License (LGPL)