Shell Programming and Scripting

I used the suggestion from Chubler. Namely:

Code:

#!/usr/bin/sh 
 
while read fname; do 
    bname=$(basename $fname) 
    first=0 
    {
      hostname
      /usr/local/bin/hosts
    } | while read box; do 
        t=$(ssh ${box} "/usr/local/bin/md5 /opt/dba/scp/$bname" | awk '{print $4}') 
        if [ $first -eq 0 ]; then 
            hash=$t
            first=1 
        else 
            [ "${hash}" == "${t}" ] || echo Files are not Identical!!!
        fi 
 
    done 
done < /home/izivanov/iz3

You said you incorporated it, not copied it letter-for-letter...

Could you put echo statements inside the loops to see where it's hanging?

Code:

#!/usr/bin/sh 
 
while read fname; do 
    bname=$(basename $fname) 
    echo "trying "${fname} (${bname})" >&2
    first=0 
    {
      echo "running hostname" >&2
      hostname
      echo "finished running hostname, now running /usr/local/bin/hosts" >&2
      /usr/local/bin/hosts
    } | while read box; do 
        echo "ssh-ing to box ${box}" >&2
        t=$(ssh ${box} "/usr/local/bin/md5 /opt/dba/scp/$bname" | awk '{print $4}') 
        if [ $first -eq 0 ]; then 
            hash=$t
            first=1 
        else 
            [ "${hash}" = "${t}" ] || echo "Files are not Identical!!!"
        fi 
 
    done 
done < /home/izivanov/iz3

Also fixed some might-have-been-syntax errors, highlighted in red. Not all shells know what == means, but = should go. And you shouldn't have loose !'s hanging around unquoted, in some shells ! is a history command.

Code:

[ "${hash}" = "${t}" ] || echo "Files are not Identical!!!"

Shouldn't it be "!=" where the "=" is? I want to have the echo statement say that when the files are not the same, right?

Thank you!

---------- Post updated at 12:21 PM ---------- Previous update was at 12:02 PM ----------

It says:

Syntax error on line 5 : '(' is not expected!

this || that means "run this, and if it fails, run that". So if it's not equal, it runs echo ...
The && syntax is the opposite: run this, if it succeeds, run that.

It's very handy for chaining a number of dependent commands in a row without needing n+1 levels of nested if. a && b && c && d && e will stop at b if b fails.
My bad, I put an extra quotation mark in that. Substitute this line:

Code:

echo "trying ${fname} (${bname})" >&2

Wow okay here we go finally:

(root):/home/izivanov# sh dirsync3.sh
trying /opt/dba/scp/xxxxxxxx (xxxxxxxxxxxc)
running hostname
ssh-ing to box xxxxxxx
finished running hostname, now running /usr/local/bin/hosts
trying /opt/dba/scp/xxxxxxxxx (xxxxxxxxxx)
running hostname
ssh-ing to box xxxxxxxx
finished running hostname, now running /usr/local/bin/hosts
trying /opt/dba/scp/xxxxxxxxxxx (xxxxxxx)
running hostname
ssh-ing to box xxxxxx
finished running hostname, now running /usr/local/bin/hosts
trying /opt/dba/scp/xxxxxxxxxx (xxxxxxxxxxxx)
running hostname
ssh-ing to box xxxxxx
finished running hostname, now running /usr/local/bin/hosts
trying /etc/sudoers (sudoers)
running hostname
ssh-ing to box xxxxxxx
finished running hostname, now running /usr/local/bin/hosts
trying /opt/dba/binxxxxxxxxxx (xxxxxxxxxxxx)
running hostname
ssh-ing to box xxxxxxx
finished running hostname, now running /usr/local/bin/hosts


At least that's output! Confused on the output. It doesn't give me much useful info about which box these files are not identical to the original box...

---------- Post updated at 02:31 PM ---------- Previous update was at 02:25 PM ----------

Looks like its just running the hosts and hostname and not recognizing them as executables!

---------- Post updated at 02:33 PM ---------- Previous update was at 02:31 PM ----------

Somehow its supposed to run the MD5 on the file against the "hosts" file and also "hostname" which is the current box name from which I'm running this script!

You were running these files as executables before -- maybe accidentally, but that had me assuming they were scripts. Are they actually just text files?

Sorry here is the hosts file:

Code:

cat <<-EnD | egrep -vx "`/usr/bin/hostname`"
box 1
box 2
~
~
~
box n
EnD

And the hostname is just an executable that brings up the hostname of the server I am on currently! Host is also an executable file!