saving output from bash into a file Post: 302531758

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Top Forums Shell Programming and Scripting saving output from bash into a file Post 302531758 by Corona688 on Friday 17th of June 2011 06:18:33 PM

06-17-2011

Registered User

It goes into excludedata because that's where you tell it to go.

Imagine you're putting ssh host cat file into a script file, and running the script. [icode]./script.sh[/icode would print it to your terminal. ./script.sh > excludedata would go into excludedata.

The idea of redirecting the end of a while-loop is the same. We can capture the output of that whole section of code, just like it was a separate script file. It's one of the shell's handier features.

Code:

while read host
do
        # think of 'tr' like 'cat' except here it changes newlines into spaces.
        # You don't have to mangle the text in your shell, it's already been
        # catted into standard output.  Which goes into excludedata.
        if ssh $host "tr '\n' ' ' < /usr/openv/netbackup/exclude_list"
        then
                # This won't work because it runs locally.
                # It's ALREADY BEEN PRINTED anyway.  
#              echo $(cat /usr/openv/netbackup/exclude_list) >&2

                echo # add a newline to the end, because tr deleted them all
        else
                # If it fails, it won't print any data, so we print something else.
                echo "$host fail"
        fi

done < servers_test > excludedata 2> logintest

excludedata will contain the contents of each server's /usr/openv/netbackup/exclude_list, or "hostname fail" if it couldn't get through to it. logintest will contain the error output of ssh such as 'ssh: abhmq01.abh-sort.us.dhl.com: Temporary failure in name resolution' if anything couldn't be contacted. This way you can keep the data and error messages separate to make your output much easier to use later.

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LEARN ABOUT PLAN9

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