What is command line options?
Command line options are commands used to pass parameters to a program. These entries, also known as command line switches, can provide instructions for changing various settings or executing commands in an interface.
The syntax of command line options differs from operating system to operating system. By default, in MS-DOS / Windows, a command line option is identified by a letter preceded by a forward slash.
As an example, the XCOPY command, which is used to copy files and directories, can be started with the following options, among others:
/ T - just copy the directory structure
/ C - Continue even if an error occurs
/ R - overwrite read-only files
The command 'xcopy c: dir1d: dir2 / R' copies files and subdirectories from the subdirectory 'dir1' in drive 'C:' to the subdirectory 'dir2' in drive 'D:' and overwrites write-protected files that are already in ' d: dir2 'exist.
In Unix, the convention uses a hyphen instead of a slash followed by a letter. For example, the command 'ls -l' runs a long list ('-l') of files and subdirectories in the current directory. The list contains further information such as file sizes, attributes, change dates, etc. Without the '-l' option, only the names of the files and subdirectories are listed.
The choice of a slash or a hyphen depends on the programmer. For example, most Linux programs ported to Windows still use the Unix convention when specifying command line options. The source code must be changed to use the Windows convention.