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Notation rules · 75lb/command-line-args Wiki · GitHub
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Notation rules
Lloyd Brookes edited this page Jan 16, 2019
·
8 revisions
Notation rules for setting command-line options.
- Option order is insignificant. Whether you set
--example
at the beginning or end of the arg list makes no difference. - Options with a type of
Boolean
do not need to supply a value. Setting--flag
or-f
will set that option's value totrue
. This is the only type with special behaviour - all othertype
values act as setter functions. - Three ways to set an option value
--option value
--option=value
-o value
- Two ways to set a list of values on options with multiple set
--list one two three
--list one --list two --list three
- One way to set a list of values on options with lazyMultiple set
--list one --list two --list three
- Short options (alias) can be set in clusters. The following are equivalent:
-a -b -c
-abc
Imagine you'd like to use an example app to search for the query -f
.
$ example --search -f
We have an ambiguity issue here: command-line-args will assume we are setting two options (--search
and -f
). In actuality, we are passing one option (--search
) and one value (-f
). In cases like this, avoid ambiguity by using --option=value
notation:
$ example --search=-f
Please note that --option=value
notation is available for long options only (e.g. --option
), not short options like -o
.
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