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Full Discussion: question about getopt()
Top Forums Programming question about getopt() Post 28230 by hell666 on Monday 16th of September 2002 02:04:36 AM
Old 09-16-2002
'optarg' is of type 'string' (char *). If 'off_t' is of type int, use atoi() to convert optarg to type off_t.
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getopt(1)						      General Commands Manual							 getopt(1)

       getopt - parse command options

       set - - getopt optstring $*

       The  command  breaks  up  options in command lines for easy parsing by Shell procedures and checks for legal options.  The optstring option
       letters are recognized if a letter is followed by a colon, the option expects an argument which may or may not  be  separated  from  it	by
       white space.  For further information, see

       The special option, specified by two minus signs (- -), delimits the end of the options.  If the delimiters are used explicitly, recognizes
       it; otherwise, generates it.  In either case, places the delimiter at the end of the options.  The positional parameters ($1 $2 ...) of the
       shell  are reset so that each option is preceded by a single minus sign (-) and is in its own positional parameter; each option argument is
       also parsed into its own positional parameter.

       The following code fragment shows how you can process the arguments for a command that can take the options a or b, as well as  the  option
       o, which requires an argument:
       set -- getopt abo: $*
       if [ $? != 0 ]
	    echo $USAGE
	    exit 2
       for i in $*
	    case $i in
	    -a | -b)  FLAG=$i; shift;;
	    -o)  OARG=$2; shift 2;;
	    --)  shift; break;;
       This code accepts any of the following as equivalent:
       cmd -aoarg file file
       cmd -a -o arg file file
       cmd -oarg -a file file
       cmd -a -oarg -- file file

       The command prints an error message on the standard error when it encounters an option letter not included in optstring.

See Also
       sh5(1), getopt(3)


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