eshell: Arguments
2.2 Arguments
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Command arguments are passed to the functions as either strings or
numbers, depending on what the parser thinks they look like. If you
need to use a function that takes some other data type, you will need to
call it in an Elisp expression (which can also be used with 
expansions Expansion.). As with other shells, you can escape special
characters and spaces with the backslash (‘\’) and apostrophes (‘''’)
and double quotes (‘""’). This is needed especially for file names with
special characters like pipe (‘|’), which could be part of remote file
names.
Info Catalog
eshell: Invocation
eshell: Commands
eshell: Built-ins