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This is the command getflagsplan9 that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


getflags, usage - command-line parsing for shell scripts

SYNOPSIS


getflags $*

usage [ progname ]

DESCRIPTION


Getflags parses the options in its command-line arguments according to the environment
variable $flagfmt. This variable should be a list of comma-separated options. Each
option can be a single letter, indicating that it does not take arguments, or a letter
followed by the space-separated names of its arguments. Getflags prints an rc(1) script
on standard output which initializes the environment variable $flagx for every option
mentioned in $flagfmt. If the option is not present on the command-line, the script sets
that option's flag variable to an empty list. Otherwise, the script sets that option's
flag variable with a list containing the option's arguments or, if the option takes no
arguments, with the string 1. The script also sets the variable $* to the list of
arguments following the options. The final line in the script sets the $status variable,
to the empty string on success and to the string usage when there is an error parsing the
command line.

Usage prints a usage message to standard error. It creates the message using $flagfmt, as
described above, $args, which should contain the string to be printed explaining non-
option arguments, and $0, the program name (see rc(1)). If run under sh(1), which does
not set $0, the program name must be given explicitly on the command line.

EXAMPLE


Parse the arguments for leak(1):

flagfmt='b,s,f binary,r res,x width'
args='name | pid list'
if(! ifs=() eval `{getflags $*} || ~ $#* 0){
usage
exit usage
}

SOURCE


/src/cmd/getflags.c
/src/cmd/usage.c

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