GETFLAGS(8) GETFLAGS(8)
NAME
getflags, usage - command-line parsing for shell scripts
SYNOPSIS
aux/getflags $*
aux/usage
DESCRIPTION
Getflags parses the options in its command-line arguments
according to the environment variable $flagfmt. This vari-
able 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 con-
taining 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.
Additionally, getflags collects arguments according to the
environment variable $ptflagfmt. This variable has the same
format as $flagfmt. Getflags adds to the output script a
line setting $ptflag to the list collected arguments.
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)).
EXAMPLE
Parse the arguments for leak(1):
flagfmt='b,s,f binary,r res,x width'
args='name | pid list'
if(! ifs=() eval `{aux/getflags $*} || ~ $#* 0){
aux/usage
exit usage
}
SOURCE
/sys/src/cmd/aux/getflags.c
/sys/src/cmd/aux/usage.c
GETFLAGS(8) GETFLAGS(8)
SEE ALSO
arg(2)