piped function does not pass variable value

[fcic1]

Hi! I am a beginer in shell scripting and I have the following problem: I define a variable inside a function, but when i use the function with a pipe, i can't get the variable's value in main program.
How can i do to have the variable value after it exits the function? or any other idea how can i do this work ?
Thanks!

---------------------------------------------
#! /bin/ksh

user1="aaaaa"
pass1="bbbbb"

function1()
{
sleep 2
echo $user1
sleep 2
echo $pass1
sleep 1
var_1=`ls -l test1.out`
sleep 1
echo "echo $var_1"
sleep 1
}

function1 | telnet host

echo $var_1
------------------------------------------

 

[PHV]

HAve you tried to export var_1 before calling the function ?

Hope This Help, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884

 

[fcic1]

I tried but doesn't work.
Of course if I do: export var_1=`ls -l test1.out`
before calling the function will always show the file from the host I'm running from the script, not fom the one I want to telnet to.

 

[PHV]

Have you tried this ?
var_1=[highlight]'[/highlight]`ls -l test1.out`[highlight]'[/highlight]

Hope This Help, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884

 

[aigles]

If found this in an AIX documentation

pipeline
A sequence of one or more commands separated by pipe (|). [highlight]Each command in the
pipeline, except possibly the last command, is run as a separate process[/highlight]. However, the
standard output of each command that is connected by a pipe becomes the standard
input of the next command in the sequence. If a list is enclosed with parentheses, it is
carried out as a simple command that operates in a separate

If the function is run in a separate process, the modifications of the environment are lost at the exit of the function.

I have written the following script to verify that :
[tt]
fct() {
Var="set by function ($$)"
export Var
echo "Inside function ($$), Var='$Var'"
ps
}
Var="set by main ($$), before function/pipe"
export Var
echo "Before function/pipe, Var='$Var'"
fct | cat
echo "After function/pipe, Var='$Var'"
[/tt]

The result is :
[tt]
Before function/pipe, Var='set by main (59590), before function/pipe'
Inside function (59590), Var='set by function (59590)'
PID TTY TIME CMD
19348 pts/14 0:00 ps
32090 pts/14 0:00 cat
49402 pts/14 0:00 -ksh
59590 pts/14 0:00 ksh fct_pipe.shl
After function/pipe, Var='set by main (59590), before function/pipe'
[/tt]

Inside the function, the special variable $$ doesn't change.
The 'ps' command doesn't show a supplemental process executing the function. Why ?
The modification of the exported variable is lost.
The result is the same when i run the script with bourne shell.



Jean Pierre.