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getflags, usage - command-line parsing for shell scripts


getflags $*

usage [ progname ]


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.


Parse the arguments for leak(1):

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



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