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Full Discussion: Bash script to detect nonpingable hosts
Top Forums Shell Programming and Scripting Bash script to detect nonpingable hosts Post 302815893 by Don Cragun on Sunday 2nd of June 2013 01:48:47 PM
Old 06-02-2013
Quote:
Originally Posted by newbie2010
I have a script to detect if a host is pingable or not. The problem is that I would like it to put the nonpingable hosts in one file and the pingable hosts in another. I have come up with this so far:

Code:
for ip in `cat /tmp/testlist2`; do ping -c 3 $ip >/dev/null && echo "$ip is up" || echo "$ip is down"; done>/tmp/s4.file
cat /tmp/s4.file |grep -i down >/tmp/f1.file
cat /tmp/s4.file |grep -i up >/tmp/sup.file

This works but it is clumsy. If I try to just do a redirect after the ping it doesn't work, though. What I get is only the first host name that the ping is tried on. Would I need another loop to get the hosts in two different files? Any suggestions?
You could try something like:
Code:
rm -f /tmp/f1.file /tmp/sup.file
for ip in $(cat /tmp/testlist2)
do      ping -c 3 $ip >/dev/null && echo "$ip is up" >> /tmp/sup.file || echo "$ip is down" >> /tmp/f1.file
done

Last edited by Don Cragun; 06-02-2013 at 02:50 PM.. Reason: Reversed the redirections...
This User Gave Thanks to Don Cragun For This Post:
newbie2010
 

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LEARN ABOUT CENTOS

libssh2_knownhost_get

libssh2_knownhost_get(3)					  libssh2 manual					  libssh2_knownhost_get(3)

NAME

       libssh2_knownhost_get - get a known host off the collection of known hosts

SYNOPSIS

       #include <libssh2.h>

       int libssh2_knownhost_get(LIBSSH2_KNOWNHOSTS *hosts,
				 struct libssh2_knownhost **store,
				 struct libssh2_knownhost *prev):

DESCRIPTION

       libssh2_knownhost_get(3) allows an application to iterate over all known hosts in the collection.

       store should point to a pointer that gets filled in to point to the known host data.

       prev  is  a  pointer  to  a previous 'struct libssh2_knownhost' as returned by a previous invoke of this function, or NULL to get the first
       entry in the internal collection.

RETURN VALUE

       Returns 0 if everything is fine and information about a host was stored in the store struct.

       Returns 1 if it reached the end of hosts.

       Returns negative values for error

AVAILABILITY

       Added in libssh2 1.2

SEE ALSO

       libssh2_knownhost_readfile(3) libssh2_knownhost_writefile(3) libssh2_knownhost_add(3)

libssh2 1.2							    28 May 2009 					  libssh2_knownhost_get(3)
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