options:

-h, --help

Print help (this message) and exit.

--include-path=PATHS

Set include paths. Separated by `:'. Use `;' on Windows.

-M, --depends

Output a makefile import dependency list to stdout

--no-color

Disable colorized output.

--no-ie-compat

Disable IE compatibility checks.

--no-js

Disable JavaScript in less files

-l, --lint

Syntax check only (lint).

-s, --silent

Suppress output of error messages.

--strict-imports

Force evaluation of imports.

--insecure

Allow imports from insecure https hosts.

-v, --version

Print version number and exit.

-x, --compress

Compress output by removing some whitespaces.

--clean-css

Compress output using clean-css

--clean-option=opt:val

Pass an option to clean css, using CLI arguments from https://github.com/GoalSmashers/clean-css e.g. --clean-option=--selectors-merge-mode:ie8 and to switch on advanced use --clean-option=--advanced

--source-map[=FILENAME]

Outputs a v3 sourcemap to the filename (or output filename.map)

--source-map-rootpath=X

adds this path onto the sourcemap filename and less file paths

--source-map-basepath=X

Sets sourcemap base path, defaults to current working directory.

--source-map-less-inline puts the less files into the map instead of referencing them

--source-map-map-inline

puts the map (and any less files) into the output css file

--source-map-url=URL

the complete url and filename put in the less file

-rp, --rootpath=URL

Set rootpath for url rewriting in relative imports and urls. Works with or without the relative-urls option.

-ru, --relative-urls

re-write relative urls to the base less file.

-sm=on|off

Turn on or off strict math, where in strict mode, math

--strict-math=on|off

requires brackets. This option may default to on and then be removed in the future.

-su=on|off

Allow mixed units, e.g. 1px+1em or 1px*1px which have units

--strict-units=on|off

that cannot be represented.

--global-var='VAR=VALUE' Defines a variable that can be referenced by the file.

--modify-var='VAR=VALUE' Modifies a variable already declared in the file.

-------------------------- Deprecated ----------------

-O0, -O1, -O2

Set the parser's optimization level. The lower the number, the less nodes it will create in the tree. This could matter for debugging, or if you want to access the individual nodes in the tree.

--line-numbers=TYPE

Outputs filename and line numbers. TYPE can be either 'comments', which will output the debug info within comments, 'mediaquery' that will output the information within a fake media query which is compatible with the SASS format, and 'all' which will do both.

--verbose

Be verbose.