jim@tiamat.fsc.com (Jim O'Connor) (09/28/90)
What is a quick way for a shell script to find out if a networked host is currently available? For instance, I'd like to do something like if host_present hostname then # run network commands else # take other action fi Using just about rsh (or rcmd, or remsh, depending on your flavor) command will work, but it takes rsh (mine anyway) over a minute to time out, and I'd like to use something that works a little quicker. I have a socket library, so if you just have programming tips, send them along and I'll try to write a program that does just what I want. Thanks, --jim ------------- James B. O'Connor jim@tiamat.fsc.com Ahlstrom Filtration, Inc. 615/821-4022 x. 651
lih@cbnewsk.att.com (andrew.a.lih) (10/04/90)
In article <771@tiamat.fsc.com>, jim@tiamat.fsc.com (Jim O'Connor) writes: > What is a quick way for a shell script to find out if a networked > host is currently available? If you just want to know if the host is alive, then the 'ping' program will suffice. It basically sends packets over to the host you specify and returns the round trip time for the packet. Most of the time it is used to detect delays and transmission times, but in this case you can use it to see if the machine is up. /lih AT&T Bell Labs Middletown, NJ
peiffer@cs.umn.edu (Tim Peiffer (The Net Guy)) (10/06/90)
In article <1990Oct3.200749.16049@cbnewsk.att.com> lih@cbnewsk.att.com (andrew.a.lih) writes: >In article <771@tiamat.fsc.com>, jim@tiamat.fsc.com (Jim O'Connor) writes: >> What is a quick way for a shell script to find out if a networked >> host is currently available? If you want more than what 'ping' offers, but not the mess that rwho provides, check out rup(), and rusers(). Tim -- ----------- Tim Peiffer peiffer@cs.umn.edu or Computer Science Dept ..!rutgers!umn-cs!peiffer University of Minnesota