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Does command-line have a hyphen?
Hyphenate as an adjective. Customers enter commands at a command prompt, not on a command line. It’s OK to use on the command line in the context of building apps using command-line tools in Visual Studio. Use command-line program in content for a general audience.
What does hyphen mean in command-line?
A double hyphen followed by a space can also be used to indicate “this is the end of commands; everything that follows is a file name, even if it looks like a command”. And a single hyphen with no following letters can indicate “read from stdin, not from a file”.
Why hyphen is used in Linux?
We all know that when we use hyphen after the command cd , we will change to the previous working directory; and when we use hyphen after the input redirection << , the bash will ignore the leading tabs (but not spaces) in the here script.
What is dash command in Linux?
Dash is an acronym for Debian Almquist shell (dash). It is a Unix and Linux shell which is much smaller than bash but still aiming at POSIX-compliancy. dash is a POSIX-compliant implementation of /bin/sh that aims to be as small as possible. dash is the standard command interpreter for the Linux system.
What’s the difference between one hyphen and two?
One hyphen is the way options to a command traditionally has been given to Unix-commands. They have one hypen followed by a single letter (or sometimes number) (-a -i -T). Some options are followed by an argument (-ofilename -o filename).
What are the options in the command line?
In the original Unix tradition, command-line options are single letters preceded by a single hyphen. Mode-flag options that do not take following arguments can be ganged together; thus, if -aand -bare mode options, -abor -bais also correct and enables both. The argument to an option, if any, follows it (optionally separated by whitespace).
When to use a double hypen in Bash?
Finally a double hypen is used to tell a command that the list of options are finished, and that what follows are arguments – no matter how much they may look like options.
Can a single hyphen indicate read from stdin?
And a single hyphen with no following letters can indicate “read from stdin, not from a file”. However, all of this is program-dependent. Any given program can violate any of these standards, as seen, for example, with find.