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Top Forums Shell Programming and Scripting Check connectivity with multiple hosts - BASH script available here Post 302937321 by Fr3dY on Thursday 5th of March 2015 04:20:50 AM
Old 03-05-2015
Quote:
Originally Posted by MadeInGermany
I have found a simple alternative to your telnet test:
Code:
timeout(){
to=$1; shift
perl -e "alarm $to; exec @ARGV" "$@"
}
f_telnet(){
# pass the terminator char to telnet, join its stderr to stdout, and grep for "Connection closed"
printf "%d\n" 0x1d | timeout 3 telnet $1 $2 2>&1 | grep "^Connection .*closed" >/dev/null
}

It returns 0 (the status of the grep) if localhost listens on port 25.
For example
Code:
if f_telnet localhost 25; then echo positive; else echo negative; fi

I'll take a look later, but I think I used the terminal output to experiment with it Smilie


Thanks!
 

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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 invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, 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 the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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