I have run out of ideas as to why this select doesn't work in a script I am writing.
The script sources a file of common functions and I am trying to use a select statement within one of the functions -
Code:
PS3="Try? "
select X in CONT EXIT; do
if [[ -n $X ]]
then
M_USER_SELECTION=$X
break
fi
done
When I look at the output I see the prompt is drawn twice, which suggests that the loop is taking input from somewhere and finding it wanting, so is prompting again?
OP -
Code:
1) CONT
2) EXIT
Try? Try?
I have tried every variation. I can get this to work without problem in simple test scripts. At present, no matter what I try, the script drops straight through the loop and the variable isn't set as the user never gets a chance to do anything.
Yes, like I said, I too can get it to work in other scripts.
In fact if I source this same file of functions and call the function with the menu in, it works?!?
I'm wondering why I am getting the prompt twice, that seems to be the only symptom. Have I messed up the environment somehow? I'm definitely not calling the function twice, but I'm getting the prompt twice after setting PS3....
I'm baffled.
---------- Post updated at 04:13 PM ---------- Previous update was at 03:43 PM ----------
I have replaced the select statement with a while read -e statement and the loop drops straight through like the select does.
I'm beginning to suspect that the code is not reading from standard in but maybe I have an open file descriptor within the code somewhere, 2000+ lines....
Are there any debug commands that let me look at what is being read from?
I know that there is a named pipe being held open by a background child process and I'm wondering if the read is being affected by this??
---------- Post updated at 04:48 PM ---------- Previous update was at 04:13 PM ----------
I think I'm getting somewhere now. The script runs multiple jobs via ssh on remote servers and then exits after they have completed.
Looking at the ps output and the lsof for the user I see a lot of open ssh connections -
I guess most of these are because I have been debugging the script and killing the script before it cleans up on exit. But I do wonder if there is a way of explicitly closing these connections and I still don't know if they are at the root of the problem of the read ...
---------- Post updated at 06:03 PM ---------- Previous update was at 04:48 PM ----------
I was correct to think it was reading from somewhere. I short circuited the function with this loop that explicitly reads from stdin -
Code:
echo "Choose -"
while read -e X <&2
do
case $X in
1)M_USER_SELECTION=CONTINUE;break;;
2)M_USER_SELECTION=EXIT;break;;
*);;
esac
done
return
Now it blocks on the read instead of dropping straight through.
I guess I should try and see where the select is reading from ...
---------- Post updated at 06:12 PM ---------- Previous update was at 06:03 PM ----------
Well, the "Fix" if it can be called that was to -
Code:
m_present_menu()
{
[[ $# -eq 0 ]] && m_fail 1 "Error: Usage (${FUNCNAME})"
local OPTIONS=$(cat "${1}" | tr "\n" " ")
PS3="Please select a response - "
select ACTION in ${OPTIONS}
do
if [[ -n ${ACTION} ]]
then
M_USER_SELECTION=${ACTION}
break
fi
done <&2
}
Although I would have preferred to understand where it was reading from without the explicit direction to read from stdin
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