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Shell Programming and Scripting

problem in automating "fdisk" command using send and expect

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Top Forums Shell Programming and Scripting problem in automating "fdisk" command using send and expect
# 1  
Old 08-07-2012
CPU & Memory problem in automating "fdisk" command using send and expect
hi
i want to automate fdisk command .
i spawned a process containing fdisk command from a process
and tried to send the options to fdisk promt from that process.
but that spawed process is notstarting itself


help me out

trying for two days
Smilie

my code:
Code:
#!/bin/bash
echo starting in send
cat <<EOF > /root/test_ntp/send1
#!/usr/bin/expect -f
spawn sh spawn_process
send -- "m\n"
send -- "l\n"
send -- "q\n"
EOF
chmod 755 send1
./send1
rc=$?
if [ $rc -ne 0 ]
then
  echo failed
else
  echo passed
fi
echo done in send

Last edited by Franklin52; 08-07-2012 at 06:53 AM.. Reason: Please use code tags for data and code samples
# 2  
Old 08-07-2012
I don't know what you're trying to accomplish, but I don't see fdisk anywhere in your code.
# 3  
Old 08-07-2012
fdisk is in separate file

thats the spawned process spawn_process


code for that spawn_process


Code:
#!/bin/bash
fdisk /dev/xvdj

Smilie

Moderator's Comments:
Mod Comment Code tags for code, please.
Last edited by Corona688; 08-07-2012 at 11:18 AM..
# 4  
Old 08-08-2012
OK, I did some test and here's the conclusion:

If you spwan a process in Expect and don't literally "expect" the process's output but "send" command immediately, Expect will send command *before* the process even ready to accept inputs. Thus a better way is to actually "expect" something before "send":
Code:
expect "m for help" {
    send "m\n"
}
expect "m for help" {
    send "l\n"
}
expect "m for help" {
    send "q\n"
}

Good luck.
This User Gave Thanks to leafei For This Post:
jagak89
# 5  
Old 08-08-2012
Expect script is useless here, just perform your tasks through the pure shell script
An example
Code:
echo "n
p
1


w" | fdisk /dev/sdb

just modify the parameters to suit your requirements
This User Gave Thanks to complex.invoke For This Post:
jagak89
# 6  
Old 08-08-2012
thanks to both of you.It worked. Smilie

---------- Post updated at 01:24 AM ---------- Previous update was at 01:21 AM ----------

thanks to every one

another way of doing this
Code:
fdisk "device to be partitioned" <<EOF
n
p
1

w
EOF

Last edited by Franklin52; 08-08-2012 at 05:10 AM.. Reason: Please use code tags for data and code samples
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