how to send remote script parameters through expect script

Question

I have a program that creates a dynamic shell script using heredoc "stop_remoteServer_script.sh"

template of heredoc below

cat<<_STOP > stop_remoteServer_script.sh
#!/bin/bash

serverName=\$1
function getServerpid {
        pid=\$( ps -ef|grep \${serverName}|grep -v grep |awk '{print \$2}' )
        echo \$pid
}

function kill_soaServer {
        echo "Killing \${serverName} ........"
        ps -ef|grep \${serverName} |grep -v grep|awk '{print \$2}'|xargs kill -9
        echo "status of killing server is $?"
}

check_soaServer=\$( getServerpid );

while [[ "X\${check_soaServer}" != "X" ]]
do
        cmd_status=\$( kill_soaServer  )
        sleep 30s
        check_soaServer=\$( getServerpid  )
done

kill_soaServer \${serverName}
_STOP

actual script that goes to remote box for execution

template output

#!/bin/bash

serverName=$1
function getServerpid {
        pid=$( ps -ef|grep ${serverName}|grep -v grep |awk '{print $2}' )
        echo $pid
}

function kill_soaServer {
        echo "Killing ${serverName} ........"
        ps -ef|grep ${serverName} |grep -v grep|awk '{print $2}'|xargs kill -9
        echo "status of killing server is 0"
}

check_soaServer=$( getServerpid );

while [[ "X${check_soaServer}" != "X" ]]
do
        cmd_status=$( kill_soaServer  )
        sleep 30s
        check_soaServer=$( getServerpid  )
done

kill_soaServer ${serverName}

Now I have a below expect block of code which will invoke the above generated code in remote box with a parameter of server name

sName=$1

CMD="ssh -o StrictHostKeyChecking=no  ${remoteUserName}\@${remoteHostName} "

# script with parameter
script="./stop_remoteServer_script.sh ${sName}"

/usr/bin/expect<<END
set force_conservative 0
spawn bash  -c "${CMD} /bin/bash < ${script} "
expect  "* password: "
send -- "${MYPWD}\r"
expect  "*$*"
expect eof

END

The error I am getting is below

spawn bash -c ssh -o StrictHostKeyChecking=no  [email protected]  /bin/bash < ./stop_remoteServer_script.sh soa_server2
[email protected]'s password:
/bin/bash: soa_server2: No such file or directory

can any one help me how to send the parameter , manually it works

===================

additional try based on the suggetions :

I have created a simple network using virtual box and tried below

main program

#!/bin/bash
# script with parameter
echo "running exp example"
sName="abc123ibc"
script="a.sh"
echo "thes script is $script \n"
/usr/bin/expect -d <<END
set force_conservative 0
set timeout -1
set prompt "*$*"
puts "before swapn"
spawn scp ./a.sh -o StrictHostKeyChecking=no ansibleadm\@192.168.1.102:/home/ansibleadm/
expect "id_rsa*"
send -- "ansibleadm\r"
expect  "*$*"
expect eof
puts "second spawn"
spawn ssh  -o StrictHostKeyChecking=no ansibleadm\@192.168.1.102  /bin/bash -c  ./a.sh $sName > log.txt
expect "id_rsa*"
send -- "ansibleadm\r"
expect ""
puts "after spawn"
expect eof
END

there is another a.sh

#!/bin/bash
  
sleep 12s
echo "inside swapned script"
touch ~/sample.txt
cat > ~/sample.txt<<EOF
hi suman $1
EOF

in the sample.txt what i am always getting is below the variable is missing

[ansibleadm@AppServer ~]$ cat sample.txt 
hi suman

I have enabled the debugger of the expect and below are debug log

[ansibleadm@Centos-Control ~]$ ./exp.sh 
running exp example
thes script is a.sh \n
expect version 5.45.4
argv[0] = /usr/bin/expect  argv[1] = -d  
set argc 0
set argv0 "/usr/bin/expect"
set argv ""
executing commands from command file
before swapn
spawn scp ./a.sh -o StrictHostKeyChecking=no [email protected]:/home/ansibleadm/
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {33533}

expect: does "" (spawn_id exp6) match glob pattern "id_rsa*"? no
Enter passphrase for key '/home/ansibleadm/.ssh/id_rsa': 
expect: does "\rEnter passphrase for key '/home/ansibleadm/.ssh/id_rsa': " (spawn_id exp6) match glob pattern "id_rsa*"? yes
expect: set expect_out(0,string) "id_rsa': "
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "\rEnter passphrase for key '/home/ansibleadm/.ssh/id_rsa': "
send: sending "ansibleadm\r" to { exp6 }

expect: does "" (spawn_id exp6) match glob pattern "*"? yes
expect: set expect_out(0,string) ""
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) ""

a.sh                                                                                        100%  114   165.9KB/s   00:00    
-o: No such file or directory
StrictHostKeyChecking=no: No such file or directory
expect: read eof
expect: set expect_out(spawn_id) "exp6"
expect: set expect_out(buffer) "\r\n\ra.sh                                                                                          
 ||| 0%    0     0.0KB/s   --:-- ETA\ra.sh                                                                                        
 ||| 100%  114   165.9KB/s   00:00    \r\n-o: No such file or directory\r\nStrictHostKeyChecking=no: No such file or directory\r\n"
second spawn
spawn ssh -o StrictHostKeyChecking=no [email protected] /bin/bash -c ./a.sh abc123ibc > log.txt
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {33541}

expect: does "" (spawn_id exp10) match glob pattern "id_rsa*"? no
Enter passphrase for key '/home/ansibleadm/.ssh/id_rsa': 
expect: does "\rEnter passphrase for key '/home/ansibleadm/.ssh/id_rsa': " (spawn_id exp10) match glob pattern "id_rsa*"? yes
expect: set expect_out(0,string) "id_rsa': "
expect: set expect_out(spawn_id) "exp10"
expect: set expect_out(buffer) "\rEnter passphrase for key '/home/ansibleadm/.ssh/id_rsa': "
send: sending "ansibleadm\r" to { exp10 }

expect: does "" (spawn_id exp10) match glob pattern ""? yes
expect: set expect_out(0,string) ""
expect: set expect_out(spawn_id) "exp10"
expect: set expect_out(buffer) ""
after spawn

expect: read eof
expect: set expect_out(spawn_id) "exp10"
expect: set expect_out(buffer) "\r\n"
[ansibleadm@Centos-Control ~]$

You didn't need to show any of the generation of the script: it has no bearing whatsoever on the error message. — glenn jackman
– glenn jackman, Commented Feb 17, 2021 at 22:56
Question: does the generated script reside on the remote host or only locally? — glenn jackman
– glenn jackman, Commented Feb 17, 2021 at 22:57
Note, in the kill_soaServer function, you forgot to escape $? — glenn jackman
– glenn jackman, Commented Feb 17, 2021 at 22:59
answer for the question : it stays in local folder and i am referring that script in expect block spawn .. I do read ,there is parsing happen bash > expect bash parses first and then expect parses next hence \\ escape is required — Suman g
– Suman g, Commented Feb 24, 2021 at 12:12
When using bash -c command a b c the args a b c will set $0 $1 $2, so to pass arg XXX as $1 you need to say bash -c command dummy XXX. This is not the case for -s when you just say bash -s <somefile XXX. — meuh
– meuh, Commented Feb 24, 2021 at 17:52

glenn jackman · Accepted Answer · 2021-02-17 22:53:39Z

1

You're overcomplicating the spawn:

CMD="ssh -o StrictHostKeyChecking=no  ${remoteUserName}\@${remoteHostName} "

# script with parameter
script="./stop_remoteServer_script.sh ${sName}"

/usr/bin/expect<<END
  set force_conservative 0
  spawn ${CMD} bash ${script}
  ...

And if the script has execute permissions, you can drop bash too.

Because the $script variable contains whitespace:

this: /bin/bash < ${script}
turns into this: /bin/bash < ./stop_remoteServer_script.sh soa_server2
which bash interprets as: /bin/bash soa_server2 < ./stop_remoteServer_script.sh
resulting in the "soa_server2: No such file" error

answered Feb 17, 2021 at 22:53

glenn jackman

88.6k16 gold badges124 silver badges179 bronze badges

what if i use script="./stop_remoteServer_script.sh\ ${sName}". adding extra escape for space , then it would go bash > expect > bash without harming space

Suman g
– Suman g

2021-02-24 08:44:11 +00:00
Commented Feb 24, 2021 at 8:44
Ye You are correct ,, that is how expect parses first and then give it bash and again bash parses

Suman g
– Suman g

2021-02-24 12:16:16 +00:00
Commented Feb 24, 2021 at 12:16
Hi Glenn, I have updated the question with a new simpler program with expect debugger on still i am unable to receive the parameter

Suman g
– Suman g

2021-02-24 17:29:07 +00:00
Commented Feb 24, 2021 at 17:29
I figured it out the solution is bash -c '/path/to/script. arg1 arg2 ' arg1 and arg2 would go in to script rather bash command

Suman g
– Suman g

2021-02-24 18:12:26 +00:00
Commented Feb 24, 2021 at 18:12

Add a comment |

meuh · Accepted Answer · 2021-02-24 17:54:51Z

1

To ask bash to read commands from stdin you need the -s option, followed by the arguments to pass to the invocation. Eg:

$ echo 'date +$1' | bash -s %Y
2021

so add -s after /bin/bash in your spawn command.

Note, for -c the arguments after the command set $0 first so you need to do, for example:

bash -c 'echo $(date +$1)' dummy %Y

edited Feb 24, 2021 at 17:54

answered Feb 17, 2021 at 14:11

meuh

54.7k2 gold badges70 silver badges139 bronze badges

I have tried that one , the problem is here ,bash is at outer layer which accepts a script file and that script needs a parameters , and that to i have to send in this format /bin/bash < ./stop_remoteServer_script.sh soa_server2 , where soa_server2 is input to the .sh file and .sh file is input to bash

Suman g
– Suman g

2021-02-17 16:50:03 +00:00
Commented Feb 17, 2021 at 16:50
If i try your way , it did nothing .

Suman g
– Suman g

2021-02-17 16:50:54 +00:00
Commented Feb 17, 2021 at 16:50
Are you adding the -s to the second bash command? spawn bash -c "${CMD} /bin/bash -s < ${script} "

meuh
– meuh

2021-02-17 19:08:02 +00:00
Commented Feb 17, 2021 at 19:08
HI , spawn bash -c "${CMD} /bin/bash -s < ${script} " there is parameter also required to pass -c "${CMD} /bin/bash -s < ${script} ${param}" the param is for script and not for bash

Suman g
– Suman g

2021-02-24 12:14:48 +00:00
Commented Feb 24, 2021 at 12:14

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