• ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no
  • The UserKnownHostsFile parameter specifies the database file to use for storing the user host keys (default is ~/.ssh/known_hosts).
  • The /dev/null file is a special system device file that discards anything and everything written to it, and when used as the input file, returns End Of File immediately.
  • By configuring the null device file as the host key database, SSH is fooled into thinking that the SSH client has never connected to any SSH server before, and so will never run into a mismatched host key.
  • The parameter StrictHostKeyChecking specifies if SSH will automatically add new host keys to the host key database file. By setting it to no, the host key is automatically added, without user confirmation, for all first-time connection. Because of the null key database file, all connection is viewed as the first-time for any SSH server host. Therefore, the host key is automatically added to the host key database with no user confirmation. Writing the key to the /dev/null file discards the key and reports success.

which expect

which should return with where the executable can be found on your system.

spawn ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no $HOST -l root \"iso=`cat $configfile | grep isolation | wc -l`; if [ $iso != "0" ]; then echo "skip host $host"; else echo $append1 >> $configfile; echo "$append2" >> $configfile; fi;\";\

As you can see I used a variable for the configfile to check whether the configfile already has the required lines in it. I thought it would be nice check, especially because on the command line on the esx host this worked:

iso=`cat $configfile | grep isolation | wc -l`; if [ $iso != "0" ]; then echo "skip host"; else echo $append1 >> $configfile; echo "$append2" >> $configfile; fi

However, as explained this didn't work an I replaced to just show the number of lines it had with isolation so I could check manually for double lines if required.

#!/bin/sh
#
 
# Variable
configfile="/etc/vmware/config"
append1='isolation.tools.copy.disable = FALSE'
append2='isolation.tools.paste.disable = FALSE'
 
stty -echo;
read -p "Input password:" A;
stty echo;
echo;
 
for HOST in esxbox501 esxbox84 esxbox79 esxbox52 esxbox78\
 esxbox51 esxbox53 esxbox54 esxbox76 esxbox77 esxbox71\
 esxbox72 esxbox12 esxbox13 esxbox09 esxbox10 esxbox14\
 esxbox15 esxbox16 esxbox17 esxbox18 esxbox20 esxbox19\
 esxbox21 esxbox59 esxbox60 esxbox68 esxbox69 esxbox63\
 esxbox64 esxbox85 esxbox62 esxbox61
do
 
echo "Connecting to $HOST"
expect -c "set timeout -1;\
spawn ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no $HOST -l root \"cat $configfile | grep isolation | wc -l; echo $append1 >> $configfile; echo $append2 >> $configfile;\";\
match_max 100000;\
expect *password:*;\
send -- $A\r;\
interact;"
echo "Finished job on $HOST"
 
done