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My Script throws the error ": read: read error: 0: Resource temporarily unavailable " the second time user input ( Unix Username ) is expected.

I suspect this has something to do with the first background process (linux_fetch &) going wrong.

How do I work around this so that the user prompt ( Unix Username ) post the background process does not get affected.

Here is short snippet of the script.

if [ -r $linux_host_list ]
then
	echo
	read -p 'Linux Username:' LUSERNAME
	read -p 'Linux Password:' LPASS
	linux_fetch &
	clear screen
else
	echo "No Linux Servers found"

fi

if [ -r $unix_host_list ]
then
	echo
	read -p 'Unix Username:' UNIXUNAME
	read -p 'Unix Password:' UPASS
	unix_fetch &
	clear screen
else
	echo "No Unix Servers found."

fi

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2 Answers

up vote 2 down vote

I'll bet that the unix_fetch process is closing or doing something else insane with stdin. Try running unix_fetch with </dev/null, so that it's stdin is redirected away to somewhere it can't do any damage.

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I still keep getting the error once in while,especially if I try to provide user input fast – Sharjeel Sayed Aug 20 '09 at 7:38
I just tried < /dev/null on a BASH script which was having the same problem, and it worked beautifully! Thanks! Can you tell me what the difference is between myscript.sh < /dev/null and myscript.sh > /dev/null? – Taeram Nov 23 '09 at 17:14
< /dev/null sets stdin (where the process reads from) to null, while > /dev/null sets stdout (where the process writes to) to null. – womble Nov 23 '09 at 18:30
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up vote 0 down vote accepted

A simple redirection of error to /dev/null did the trick for me.

linux_fetch 2> /dev/null &
unix_fetch 2> /dev/null &
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