mjhjmtu

I'm trying to fetch remote machine details (dmidecode) for many hosts using some expect command.

Below is the expect script which I'm using for this purpose.

while read i; do

/usr/bin/expect<<EOF
 spawn ssh "root@$i" dmidecode 
 expect "Password:"
 send "xxxxr";
 interact
 EOF
 
 done<iplist 

But here command which is not excecuting on the remote machine. I tried with single, double quotes and caret symbol still no luck.

Here I want to execute remote command as argument like : ssh <ip> <remote command>

Please shed me some views, I might be missed some params here, please help me

One simplification would be to eliminate the buggy and slow shell while loop which would also free up stdin to be used for interact. That is, the input file would instead be passed to and read by TCL code in the expect script.

#!/usr/bin/expect

if [llength $argv] != 1 
 puts stderr "Usage: $0 iplist-file"
 exit 1


set ipfh [open [lindex $argv 0]]

while [gets $ipfh ip] >= 0 
 spawn ssh root@$ip dmidecode
 expect "Password:"
 send "Hunter2r";
 interact

thrig has a great answer. If you want to stick with bash (even though the while-read loop is extremely slow, and tedious to get right syntax-wise), use a different file descriptor to read from the file and allow expect to hold onto stdin:

while IFS= read -r -u3 ip; do
# .................^^^
 /usr/bin/expect << EOF
 spawn ssh "root@$ip" dmidecode 
 expect "Password:"
 send "xxxxr";
 interact
EOF
done 3< iplist 
# ...^^

If the dmidecode command does not require human interaction, change interact to expect eof