backgrounded job keeps stopping

I am seeing some strange behavior on my RHEL6 bash prompt. I often like to execute command lines that look like ... $ ./myscript > junk 2>&1 ... then hit Ctrl-Z and then execute ... $ bg $ tail -f junk blah blah blah blah blah blah blah blah But today for some reason I am see that my job stays "stopped" and is not "running". $ uname -a Linux myhost 2.6.18-371.11.1.el5 #1 SMP Mon Jun 30 04:51:39 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux $ cat /etc/redhat-release Red Hat Enterprise Linux Server release 5.5 (Tikanga) $ ./myscript.sh > output-07-JUL-16.txt 2>&1 ^Z + Stopped ./myscript.sh > output-07-JUL-16.txt 2>&1 $ bg + ./myscript.sh > output-07-JUL-16.txt 2>&1 & $ jobs + Stopped ./myscript.sh > output-07-JUL-16.txt 2>&1 $ jobs + Stopped ./myscript.sh > output-07-JUL-16.txt 2>&1 The script I am running is nothing exotic ... #!/bin/sh count=wc -l hostlist total=1 for i in grep -v "^#" hostlist do echo "Doing $total or $count $i" sudo scp -q access.sh $i:/tmp sudo ssh -q $i /tmp/access.sh sleep 1 total=expr $total + 1 done