07-21-2011
The while loop will cycle through the lines of the input file, where on each line is the name or IP-address of a single host to be inspected. So 10 lines will be 10 ssh connects, one to each host.
If you deploy that script on each host, you'll have to ssh to each one though to get the information. There are different ways to achieve what you want - you could also run that script via cron on each box and have them connect to your central box delivering the info to it in intervals or once a day, whatever.
But to have passwordless communication with ssh between the hosts and your central collection box, you would have to create passwordless ssh-keys and exchange the public ssh keys to your needs.
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ZGREP(1) General Commands Manual ZGREP(1)
NAME
zgrep - search possibly compressed files for a regular expression
SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
Zgrep is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci-
fied, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and
fed to grep.
If zgrep is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, zgrep uses
it as the grep program to be invoked. For example:
for sh: GREP=fgrep zgrep string files
for csh: (setenv GREP fgrep; zgrep string files)
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1)
ZGREP(1)