Some doubts with Shell Scripting.

I have a couple of requirements to be satisfied using shell scripts. Since I am trio in this area, i would certainly need your help.

1) I have a script which invokes a env-function which will ask for a user input to proceed with the execution. I want my script to supply the answer to this. How can i implement this.

Doing a bit of googling pointed me to an "expect" command, which is unfortunately not installed in my system. Is there any other way to achieve this task?

2) I have another requirement like, the script should find the total number of CPUs in my pc and should append the "-j(2*no.开发者_StackOverflow社区 of CPU)" to my make command.

Could somebody please shed some light into how this can be done.

Thanks,

Sen

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Since the first part has been answered, for the 2nd part you can try something like

#!/bin/sh 

cpu=`cat /proc/cpuinfo | grep -e '^processor' | wc -l`
jobs=$(echo "$cpu * 2" | bc)

make -j$jobs

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I have another requirement like, the script should find the total number of CPUs in my pc

You can read the output of /proc/cpuinfo

or even better:

You can narrow down output with the following command, to display number of processors in the system:

grep processor /proc/cpuinfo

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you can simply redirect an input to that program. An example with checkinstall:

checkinstall < /path/to/file/with/answers