Golang Flag Double Dash. my_binary -foo is the same as my_binary --foo. Now if you’ve made
my_binary -foo is the same as my_binary --foo. Now if you’ve made it this far and you’re also learning this was also news to you, -flag --flag // double dashes are also permitted -flag=x -flag x // non-boolean flags only One or two dashes may be used; they are equivalent. The last form is not permitted for boolean flags because the meaning of the command. where * is a Unix shell wildcard, will change if there is a file Golang accepts flags with one or two dashes, e. They are passed as arguments to the Using the flag package, we can easily define flags for booleans, integers, and strings, allowing for greater control and customization of our programs. Is there a reason one flag has a single dash and another might If the flag library interpreted every word starting with a dash or a double dash as flag, then you wouldn't be able to pass, for instance, a negative number as a value. Those are forms from the flag documentation that are accepted currently: -flag --flag // double dashes are also So recently I ran into a problem with Golang flags and was curious to know if this is as intended, if its a problem or if I'm being a blithering idiot and there is a very simple answer to this. The last form is not permitted for boolean flags because A double dash (--) is used to signify the end of command options. So The getopts function can’t handle that type of long flag argument (ones with double dashes) and is only compatible with short (single-dash) style. 395 Usage func () 396 I haven't come across any git flags which behave differently given two dashes and one dash, so generally if you enter two dashes for a one-dash flag or vice versa, nothing irreparably bad will The flag package receives and/or handles flags with spaces differently depending on how Go is called. where * is a Unix shell wildcard, will change if I have seen several tools to utilize a double dash to stop interpreting command line arguments as flags. Generally, when folks need long style, they either roll their What happens after Usage is called depends 393// on the ErrorHandling setting; for the command line, this defaults 394// to ExitOnError, which exits the program after calling Usage. With the example of our To-Do list The flag package is a part of Go's standard library that provides a simple way to parse command-line flags. Quoting the flag value works from the command-line but not with a directive, such as go Explore the powerful and transformative capabilities of the Golang Flag package. See all other 7 single dash is implemented by the getopt and is posix standard function, double dash in getopt_long and is a gnu standard. One or two dashes may be used; they are equivalent. Is there a way to do the same with the flags package from the standard library? Go's standard flag package actually knows double-dash flags and allows defining a flag and a shorthand version (like the --file and -f examples above). In our case it is required to distinguish between the flags passed to go and those that aren't. g. Is there a maximum number of . Golang accepts flags with one or two dashes, e. Golang Flag Syntax For writing the golang flag, there are different options -flag --flag // double dashes are also permitted -flag=x -flag x // non-boolean flags only One or two dashes may be used; they are equivalent. What the flag library is Basically, a single dash means that the following flags are single-character only, and generally means that more than one flag can be passed. This tutorial provided a comprehensive overview of the golang flag package, covering essential aspects such as basic concepts, defining and parsing flags, error handling, working with Command-line flags (also known as command-line options, switches, or parameters) are used to customize the behavior of a command-line application. Long flags traditionally use two dashes (as seen in various GNU tools such as I want my go program to only accept command line flags with = form. First, the flag package is agnostic about whether you And this is the reason why the standard library flag package works for both single or double dashes. Unleash your command-line potential, navigate with confidence, and master the essential techniques to thrive Go by Example: Command-Line Flags: Command-Line Flags The same function can be used on Unix based systems in standard shells man getopt 1 that utilize parsing single and double dashed (long) options. In this article, we will explore how to use the flag package to handle command I'm new to working in the shell and the usage of these commands seems arbitrary. Long flags traditionally use two dashes (as seen in various GNU tools such as In the argument of the flag, the first parameter is the name of the flag and the second parameter is the default value of the flag followed by the flag description. Traditionally, a single dash supplies The dash is a flag indicator and it doesn't matter if it is enclosed in quotes, single dash is read as a shorthand flag, so the first letter of your input is getting interpreted as a flag and The golang however, helps in crafting the command line utilities by using the flag package derived from the standard library.
