Options can be grouped together:
ls -FI
This lists the contents of the current directory. Directories are shown with a trailing '/'; files which have execute permission are shown with a trailing '*'.
The inode number of each file is also displayed.
Some options need to be given separately:
lp -d lp2 -n4 -m report.ps
This prints four copies of the file report.ps and sends mail to the user on completion.
The option -d lp2 which specifies the printer to be used is given separately from the other options. If the command were given as
lp -d lp2n4m report.ps
the command would try to find a printer with the name lp2n4m.