1. 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.
2. Some options need to be given separately:
lpr -Plp2 -#4rm report.ps
This prints four copies of the file report.ps, removes the file and sends mail to the user on completion.
The option -Plp2 which specifies the printer to be use is given serperately from the other options. If the command were given as
lpr -Plp2#4rm report.ps
the command would try to find a printer with the name lpr2#4rm.