Need some advise on two for loops to display and to number Post: 302137361

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Top Forums Shell Programming and Scripting Need some advise on two for loops to display and to number Post 302137361 by AnswerGuy on Monday 24th of September 2007 02:28:50 PM

09-24-2007

Registered User

Making sense

Quote:

Originally Posted by newbewie

Thanks

I am running a for loop to execute a command to , say 100 hosts, but I don't know how many I have done so far or how many are left

Will it make any sense?

Newbewie,

I'm sorry to say that you're not making any sense to me. You say you're executing a command on a 100 hundred hosts and then your message talks about wanting to number the lines in a file (does that file contain a list of hostnames?). In your original message it looked like you were trying to say something about counting the current line number and the number of words on that line (or something that would involve printing each line prefixed by *two* numbers.

So, I really don't know what you're trying to do. If you just want something like a count down then you could use something like this:

Code:

 # assume file of hostnames is $1; rest of args contains command to be issued
 # to each of them and any switches to the ssh command
 hostfile="$1"
 shift
 numLines=$( wc -l $hostfile | { read x, c; echo $c;})
 donecount=1
 while read hostname; do
     echo "Executing $* on $hostname ($donecount of $numLines)"
     ssh $hostname "$@"
     let donecount += 1
     done

Where this gives you a prevew of which host is about to be contacted with a summary of how many have been done and how many there were, total, when the process first read the file?

Perhaps investing a bit more effort on posting a clear description of what you're trying to do would help.

JimD (former Linux Gazette AnswerGuy)

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LEARN ABOUT MINIX

ssh-argv0

SSH-ARGV0(1)						    BSD General Commands Manual 					      SSH-ARGV0(1)

NAME

     ssh-argv0 -- replaces the old ssh command-name as hostname handling

SYNOPSIS

     hostname | user@hostname [-l login_name] [command]

     hostname | user@hostname [-afgknqstvxACNTX1246] [-b bind_address] [-c cipher_spec] [-e escape_char] [-i identity_file] [-l login_name]
     [-m mac_spec] [-o option] [-p port] [-F configfile] [-L port:host:hostport] [-R port:host:hostport] [-D port] [command]

DESCRIPTION

     ssh-argv0 replaces the old ssh command-name as hostname handling.	If you link to this script with a hostname then executing the link is
     equivalent to having executed ssh with that hostname as an argument.  All other arguments are passed to ssh and will be processed normally.

OPTIONS

     See ssh(1).

FILES

     See ssh(1).

AUTHORS

     OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen.  Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
     Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH.  Markus Friedl contributed the support for SSH
     protocol versions 1.5 and 2.0.  Jonathan Amery wrote this ssh-argv0 script and the associated documentation.

SEE ALSO

     ssh(1)

Debian Project							 September 7, 2001						    Debian Project

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