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plan9-getflags
Langue: en
Version: 331289 (ubuntu - 24/10/10)
Section: 1 (Commandes utilisateur)
NAME
getflags, usage - command-line parsing for shell scriptsSYNOPSIS
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
SEE ALSO
arg(3)Contenus ©2006-2024 Benjamin Poulain
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