Help message is displayed with the options available.

lessc -help
lessc -h

It includes the available paths to the library. These paths can be referenced simply and relatively in the Less files. The paths in windows are separated by colon(:) or semicolon(;).

lessc --include-path = PATH1;PATH2

It generates a makefile import dependencies list to stdout as output.

lessc -M
lessc --depends

It disables colorized output.

lessc --no-color

It disables IE compatibility checks.

lessc --no-ie-compat

It disables the javascript in less files.

lessc --no-js

It checks the syntax and reports error without any output.

lessc --lint
lessc -l

It forcibly stops the display of error messages.

lessc --silent
lessc -s

It force evaluates imports.

lessc --strict-imports

It imports from the insecure HTTPS hosts.

lessc --insecure

It displays the version number and exits.

lessc -version
lessc -v

It helps in removing the whitespaces and compress the output.

lessc -x
lessc --compress

It generates the sourcemap in less. If sourcemap option is defined without filename then it will use the extension map with the Less file name as source.

lessc --source-map
lessc -source-map = file.map

Rootpath is specified and should be added to Less file paths inside the sourcemap and also to the map file which is specified in your output css.

lessc --source-map-rootpath = dev-files/

A path is specified which has to be removed from the output paths. Basepath is opposite of the rootpath option.

lessc --source-map-basepath = less-files/

All the Less files should be included in the sourcemap.

lessc --source-map-less-inline

It specifies that in the output css the map file should be inline.

lessc --source-map-map-inline

A URL is allowed to override the points in the map file in the css.

lessc --source-map-url = ../my-map.json

It sets paths for URL rewriting in relative imports and urls.

lessc -rp=resources/
lessc --rootpath=resources/

In imported files, the URL are re-written so that the URL is always relative to the base file.

lessc -ru
lessc --relative-urls

It processes all Math function in your css. By default, it’s off.

lessc -sm = on
lessc --strict-math = on

It allows mixed units.

lessc -su = on
lessc --strict-units = on

A variable is defined which can be referenced by the file.

lessc --global-var = "background = green"

This is unlike global variable option; it moves the declaration at the end of your less file.

lessc --modify-var = "background = green"

To move on to every URL, an argument is allowed to specify.

lessc --url-args = "arg736357"

Inline source-mapping is generated.

lessc --line-numbers = comments
lessc --line-numbers = mediaquery
lessc --line-numbers = all

It loads the plugin.

lessc --clean-css
lessc --plugin = clean-css = "advanced"