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Need to create a simple script using MD5, SSH...

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Top Forums Shell Programming and Scripting Need to create a simple script using MD5, SSH...
# 15  
Old 03-05-2011
Computer A little light at the end of a tunnel!!!
They're not big...and all the servers should have that path to that function the same!

We'll see! Thank you very much for all your assistance! I'll keep this open since I can't work on this until Monday!
# 16  
Old 03-05-2011
Quote:
Originally Posted by zixzix01
They're not big...and all the servers should have that path to that function the same!
If they don't, and the files are small, you can just pipe them into your local md5.
Code:
ssh username@host cat /path/to/${fname} |/usr/local/bin/md5 ...

The ssh command ends when I've colored it red. Everything else is local. (to put a pipe in the foreign host you'd have to backslash it, like \|, to prevent your shell from handling it itself.)
# 17  
Old 03-07-2011
I have gotten somewhere but still need help!
I got some pointers but am still not getting anywhere. The stuff thats commented out are suggestions to use!


Code:
#!/usr/bin/sh 
 
set -A HOSTS `/usr/local/bin/hosts` `hostname` 
 
while read fname 
do 
        hash=$(/usr/local/bin/md5 ${fname} | awk '{print $4}' ) 
        bname=$(basename $fname) 
 
   #first=0 
   #for box in `/usr/local/bin/hosts` `hostname`; do 
   #for box in ${HOSTS[@]}; do 
        while read box 
        do 
      #if [ $first eq 0 ]; then 
      #  <do stuff here> 
      #  $first=1 
      #else 
      #  <more stuff> 
      #fi 
                t=$(ssh ${box} "/usr/local/bin/md5 /opt/dba/scp/$bname" | awk '{print $4}')  
                [ "${hash}" != "${t}" ] | echo Files are not Identical!!!  
         
        done < /home/izivanov/iz_hosts 
done < /home/izivanov/iz2

So I used that:

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

Now I'm getting a syntax error on line 11, saying that 'for' is not matched!

Any suggestions?

Thanks
# 18  
Old 03-07-2011
It means what it says, the 'for' is unmatched. What usually matches for? done; you never closed that second 'for' loop.

If you have more than a small amount of data, backticks are a bad idea, since shell variables have limits on many platforms -- try and cram more than a few K into them and the end will get chopped off. See useless use of backticks.
# 19  
Old 03-07-2011
This is closer to what you want

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/iz



Things to note:
  • Get rid of the 3 different methods to loop thru host list and just use 1. I picked the while read box (with input from hostname and /usr/local/bin/hosts)
  • With test the numeric equals operator is -eq not eq
  • On first loop just assign hash with value from t, on 2nd and subsequent loops check t match hash
  • Don't put $ in front of a variable when assigning it $first=1 will not work
  • When testing hash use == with || or != with && ( single | is a pipe and would not have worked at all)
  • You forgot to direct your filelist into the while read fname loop
Last edited by Chubler_XL; 03-07-2011 at 05:52 PM..
# 20  
Old 03-08-2011
Thanks Corona, I did realize that,

Thanks Chubler, I did put in your suggestions. However I am getting no output now.

I can't seem to grasp the concept. I know what I want it to output but I don't know yet how to translate that into a simple script! Frustrating!
# 21  
Old 03-08-2011
My psychic powers tell me you're missing a... a... 'fi'! Somewhere in line... line... um...

I'm sorry, I can't continue this psychic debugging session until you insert $3.99 into your CDROM.

...either that or post your code :P We can't see it from here!
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