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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!nntp.coast.net!dispatch.news.demon.net!demon!awfulhak.demon.co.uk!awfulhak.demon.co.uk!awfulhak.demon.co.uk!not-for-mail From: brian@awfulhak.demon.co.uk (Brian Somers) Newsgroups: comp.sys.sun.admin,alt.sys.sun,comp.unix.bsd.misc,comp.unix.programmer,comp.unix.bsd.bsdi.misc,comp.unix.admin Subject: Re: ping script Followup-To: comp.sys.sun.admin,alt.sys.sun,comp.unix.bsd.misc,comp.unix.programmer,comp.unix.bsd.bsdi.misc,comp.unix.admin Date: 5 Jul 1996 13:52:40 -0500 Organization: Coverform Ltd. Lines: 26 Message-ID: <4rjo9o$gn@anorak.coverform.lan> References: <Pine.SOL.3.93.960702171209.4062B-100000@gold.acns.fsu.edu> <31DA8A95.61BB@hybrid.com> NNTP-Posting-Host: localhost.coverform.lan X-NNTP-Posting-Host: awfulhak.demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Xref: euryale.cc.adfa.oz.au comp.sys.sun.admin:70083 alt.sys.sun:10377 comp.unix.bsd.misc:1218 comp.unix.programmer:39195 comp.unix.bsd.bsdi.misc:4257 comp.unix.admin:44536 Kenneth Coley (coley@hybrid.com) wrote: : Just look at the exit status: : : : for i in `cat ipnums` : do : ping $i > /dev/null 2>&1 : ping $i > /dev/null 2>&1 : if [ $? = 0 ] : then : runactive : else : runnoanswer : fi : done : Use two pings just because of routing issues, the : first ping may get an error. The second ping will : verify that the node is really missing. Despite the return code on FreeBSD being correct, historically, it is not guaranteed. If you want to write a portable script, don't do it this way. -- Brian <brian@awfulhak.demon.co.uk> Don't _EVER_ lose your sense of humour....