ksh: variable is gone when function is piped to tee

[w5000]

Hello,
could anyone please explain why variable DIR1 disappears in script2 (when functions f1/f2 are "piped" to tee command)?

# cat ddd
#!/usr/bin/ksh

f1 () {
DIR1=/mnt/swt
echo inside f1 DIR1 is ${DIR1}
}

f2 () {
echo inside f2 DIR1 is ${DIR1}
}

f1
echo outside f1 DIR1 is $DIR1
f2

# ./ddd
inside f1 DIR1 is /mnt/swt
outside f1 DIR1 is /mnt/swt
inside f2 DIR1 is /mnt/swt
#

# cat ddd
#!/usr/bin/ksh

f1 () {
DIR1=/mnt/swt
echo inside f1 DIR1 is ${DIR1}
}

f2 () {
echo inside f2 DIR1 is ${DIR1}
}

f1 | tee -a /tmp/log1
echo outside f1 DIR1 is $DIR1
f2 | tee -a /tmp/log1

# ./ddd
inside f1 DIR1 is /mnt/swt
outside f1 DIR1 is
inside f2 DIR1 is
#

 

[PHV]

I think that if a function is "piped" then it is executed in a subshell.

Hope This Helps, PH.
FAQ219-2884
FAQ181-2886

 

[w5000]

thank you!