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Shell Programming and Scripting

getting variables from another script

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# 1  
Old 09-02-2009
getting variables from another script
I have 2 scripts.The first script greps something and prints it

say a.sh
#!/bin/sh
ccc="grep something and cut something"
echo $ccc

When you run this it gives a value say "100"

I have b.sh and I have
#!/bin/sh
status=`/home/a.sh`
status_code=$?
echo status_code

When I run b.sh I dont get 100 but get some other number...do you know why?
# 2  
Old 09-02-2009
because you're echo'ing $?, which is the return code of the previous command, not the result of a.sh
# 3  
Old 09-02-2009
It's easier if we see the real script. This construct should capture the output from the called script.

Quote:
status=`/home/a.sh`
Code:
/home/a.sh | read status

# 4  
Old 09-02-2009
Quote:
Originally Posted by methyl
It's easier if we see the real script. This construct should capture the output from the called script.

Code:
/home/a.sh | read status


In most shells, the value of $status will be lost because each element of a pipeline is executed in a subshell.

Use:

Code:
status=$(/home/a.sh)    ## What's a script doing in /home?????
printf "Return code: %s\n" "$?"
printf "     Output: %s\n" "$status"

# 5  
Old 09-03-2009
I didn't explain myself very well. I'm not trying to pass $status to the calling shell. I'm reading the output from the echo in a.sh within b.sh. Very similar to cfajohnson POSIX shell method.

Code:
#!/bin/sh
# This is a.sh
echo "100"

#!/bin/sh
# This is b.sh
/home/a.sh | read status
echo "This came from b.sh: ${status}"


/home/a.sh

This came from b.sh: 100

# 6  
Old 09-03-2009
Quote:
Originally Posted by methyl
I didn't explain myself very well. I'm not trying to pass $status to the calling shell. I'm reading the output from the echo in a.sh within b.sh. Very similar to cfajohnson POSIX shell method.

Code:
#!/bin/sh
# This is a.sh
echo "100"

#!/bin/sh
# This is b.sh
/home/a.sh | read status
echo "This came from b.sh: ${status}"


/home/a.sh

This came from b.sh: 100


That will only work in ksh (and not even in pdksh).
# 7  
Old 09-03-2009
Hi cfajohnson.

I've tried both our scripts in HP-UX 11.11 /bin/sh (a hard link to /usr/bin/sh) and both scripts work. Please try my construct in your shell and let me know if there is an issue.

Neither script works in Bourne shell (mine misbehaves, yours gives syntax errors). We both have omitted to check what the o/p is using.
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