# xan help ```txt Print help about the `xan` expression language. `xan help cheatsheet` will print a short cheatsheet about how the language works. It can also be found online here: https://github.com/medialab/xan/blob/master/docs/moonblade/cheatsheet.md `xan help functions` will print the reference of all of the language's functions (used in `xan select -e`, `xan map`, `xan filter`, `xan transform`, `xan flatmap` etc.). It can also be found online here: https://github.com/medialab/xan/blob/master/docs/moonblade/functions.md `xan help aggs` will print the reference of all of the language's aggregation functions (as used in `xan agg` and `xan groupby` mostly). It can also be found online here: https://github.com/medialab/xan/blob/master/docs/moonblade/aggs.md `xan help scraping` will print information about the DSL used by `xan scrape` and the related functions. It can also be found online here: https://github.com/medialab/xan/blob/master/docs/moonblade/scraping.md `xan help window` will print the reference of all of the language's window aggregation functions (as used in `xan window`). It can also be found online here: https://github.com/medialab/xan/blob/master/docs/moonblade/window.md Use the -p/--pager flag to open desired documentation in a suitable pager. Use the -O/--open to read the desired documentation online (might be slightly out of date!). Usage: xan help cheatsheet [options] xan help functions [options] xan help aggs [options] xan help scraping [options] xan help window [options] xan help --help help options: -O, --open Open the desired docs in a web browser. -p, --pager Pipe the help into a pager (Same as piping with forced colors into `less -SRi`). -S, --section Filter the `functions` doc to only include sections matching the given case-insensitive query. --json Dump the help as JSON data. --md Dump the help as Markdown. Common options: -h, --help Display this message ```