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Add a help option with usage information 

Add a basic help option and usage description which is consistent
with arcstat.py and dbufstat.py.  This also adds support for long
opts.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Kyle Blatter <kyleblatter@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
This commit is contained in:
Kyle Blatter 2014-12-04 11:31:54 -08:00 committed by Brian Behlendorf
parent 3bfc7f1b20
commit 6427f39fe0
1 changed files with 25 additions and 4 deletions
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29
cmd/arc_summary/arc_summary.py
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@ -1064,22 +1064,43 @@ def zfs_header():
div2() div2()
def usage():
sys.stdout.write("Usage: arc_summary.py [-h] [-a] [-d] [-p PAGE]\n\n")
sys.stdout.write("\t -h, --help : "
"Print this help message and exit\n")
sys.stdout.write("\t -a, --alternate : "
"Show an alternate sysctl layout\n")
sys.stdout.write("\t -d, --description : "
"Show the sysctl descriptions\n")
sys.stdout.write("\t -p PAGE, --page=PAGE : "
"Select a single output page to display,\n")
sys.stdout.write("\t "
"should be an integer between 1 and " + str(len(unSub)) + "\n\n")
sys.stdout.write("Examples:\n")
sys.stdout.write("\tarc_summary.py -a\n")
sys.stdout.write("\tarc_summary.py -p 4\n")
sys.stdout.write("\tarc_summary.py -ad\n")
sys.stdout.write("\tarc_summary.py --page=2\n")
def main(): def main():
global show_sysctl_descriptions global show_sysctl_descriptions
global alternate_sysctl_layout global alternate_sysctl_layout
opts, args = getopt.getopt( opts, args = getopt.getopt(
sys.argv[1:], "adp:" sys.argv[1:], "adp:h", ["alternate", "description", "page=", "help"]
) )
args = {} args = {}
for opt, arg in opts: for opt, arg in opts:
if opt == '-a': if opt in ('-a', '--alternate'):
args['a'] = True args['a'] = True
if opt == '-d': if opt in ('-d', '--description'):
args['d'] = True args['d'] = True
if opt == '-p': if opt in ('-p', '--page'):
args['p'] = arg args['p'] = arg
if opt in ('-h', '--help'):
usage()
sys.exit()
Kstat = get_Kstat() Kstat = get_Kstat()