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Full Discussion: How to send keyboard inputs toa UNIX command executed from a shell script?
Top Forums UNIX for Dummies Questions & Answers How to send keyboard inputs toa UNIX command executed from a shell script? Post 302874753 by wisecracker on Saturday 16th of November 2013 07:03:22 PM
Old 11-16-2013
Hi Sree10...

Once again as we have no idea about your shell scripts nor commands then I have
created a very dirty example using a shell script generated on the fly awaiting a
physical "y" to be entered and an automatic "n" later, done longhand...
You will have to work out any subtleties, loops etc for yourself...
Code:
#!/bin/bash --posix
# An example ONLY...
> /tmp/Y
echo "Test for a remote Y on another shell script..."
echo -n "Enter y to continue:- "
read y
echo -n "$y" > /tmp/Y
echo -e "read wait_for_yes < /tmp/Y" > /tmp/test.sh
echo -e 'if [ "$wait_for_yes" == "y" ]' >> /tmp/test.sh
echo -e "then" >> /tmp/test.sh
echo -e "        echo 'Y was detected...'" >> /tmp/test.sh
echo -e "fi" >> /tmp/test.sh
echo -e 'if [ "$wait_for_yes" == "n" ]' >> /tmp/test.sh
echo -e "then" >> /tmp/test.sh
echo -e "        echo 'Auto N was detected...'" >> /tmp/test.sh
echo -e "fi" >> /tmp/test.sh
chmod 755 /tmp/test.sh
echo -e "Launch this command test.sh...\n"
/tmp/test.sh
echo -e "\nReturn back to the calling shell...\n"
echo "Check using N for the remote entry but not inputted manually..."
echo -e "Launch this command test.sh...\n"
echo -n "n" > /tmp/Y
/tmp/test.sh
echo -e "\nReturn back to the calling shell..."
rm /tmp/Y

Results on OSX 10.7.5, default bash terminal...
Code:
Last login: Sat Nov 16 23:41:57 on ttys000
AMIGA:barrywalker~> chmod 755 auto-yes.sh
AMIGA:barrywalker~> ./auto-yes.sh
Test for a remote Y on another shell script...
Enter y to continue:- y
Launch this command test.sh...

Y was detected...

Return back to the calling shell...

Check using N for the remote entry but not inputted manually...
Launch this command test.sh...

Auto N was detected...

Return back to the calling shell...
AMIGA:barrywalker~> _

 

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LEARN ABOUT OSF1

line

line(1) 						      General Commands Manual							   line(1)

NAME

       line - Reads one line from standard input

SYNOPSIS

       line

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       line:  XCU5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

OPTIONS

       None

DESCRIPTION

       The  line  command  copies one line, up to and including a newline, from standard input and writes it to standard output.  Use this command
       within a shell command file to read from your terminal.	The line command always writes at least a newline character.

NOTES

       The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead.

EXIT STATUS

       Success.  End-of-File.

EXAMPLES

       To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log

       This shell procedure displays the message: Enter comments for the log:

       It then reads a line of text from the keyboard and adds it to the end of the file log.  The echo  ':  c'  command  displays  a	:  (colon)
       prompt.	See the echo command for information about the c escape sequence.

SEE ALSO

       Commands:  echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p)

       Functions:  read(2)

       Standards:  standards(5)

																	   line(1)
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