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author | Russ Cox <rsc@swtch.com> | 2009-08-14 20:38:22 -0700 |
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committer | Russ Cox <rsc@swtch.com> | 2009-08-14 20:38:22 -0700 |
commit | ae03a48ba93f8ccf98093105523897833c63029c (patch) | |
tree | e20de1127f799a1cf9236917064b420020343852 /man/man8/getflags.8 | |
parent | 5a8bc78967fef8f97da30b4368ca7e79dfdd274f (diff) | |
download | plan9port-ae03a48ba93f8ccf98093105523897833c63029c.tar.gz plan9port-ae03a48ba93f8ccf98093105523897833c63029c.tar.bz2 plan9port-ae03a48ba93f8ccf98093105523897833c63029c.zip |
move files that codebot put in the wrong place
Diffstat (limited to 'man/man8/getflags.8')
-rw-r--r-- | man/man8/getflags.8 | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/man/man8/getflags.8 b/man/man8/getflags.8 new file mode 100644 index 00000000..50274d40 --- /dev/null +++ b/man/man8/getflags.8 @@ -0,0 +1,77 @@ +.TH GETFLAGS 8 +.SH NAME +getflags, usage \- command-line parsing for shell scripts +.SH SYNOPSIS +.B getflags $* +.PP +.B usage [ progname ] +.SH DESCRIPTION +.I Getflags +parses the options in its command-line arguments +according to the environment variable +.BR $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. +.I Getflags +prints an +.IR rc (1) +script on standard output which initializes the +environment variable +.BI $flag x +for every option mentioned in +.BR $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 +.BR 1 . +The script also sets the variable +.B $* +to the list of arguments following the options. +The final line in the script sets the +.B $status +variable, to the empty string on success +and to the string +.B usage +when there is an error parsing the command line. +.PP +.I Usage +prints a usage message to standard error. +It creates the message using +.BR $flagfmt , +as described above, +.BR $args , +which should contain the string to be printed explaining +non-option arguments, +and +.BR $0 , +the program name +(see +.IR rc (1)). +If run under +.IR sh (1), +which does not set +.BR $0 , +the program name must be given explicitly on the command line. +.SH EXAMPLE +Parse the arguments for +.IR leak (1): +.IP +.EX +flagfmt='b,s,f binary,r res,x width' +args='name | pid list' +if(! ifs=() eval `{getflags $*} || ~ $#* 0){ + usage + exit usage +} +.EE +.SH SOURCE +.B \*9/src/cmd/getflags.c +.br +.B \*9/src/cmd/usage.c +.SH SEE ALSO +.IR arg (3) |