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2nd argument of grep is a file name.
Either
printf "%s\n" "$rec" | grep -q "INFO"or replace it by a case statement
case $rec in
*INFO*) echo "$rec" | /usr/bin/mailx -s "Error `date`"...

tail -f

will wait for lines to be added to a file.


#!/bin/ksh
cd /path/to/logs # change to YOUR path to default .log
tail -f default.log | while read rec # loop forever
do
...

It seems like a fair error. However, you are working too hard. Make /opt/web/http.py executable, make the first line "#!/usr/bin/python", put /opt/web in $PATH and just say "nohup http.py &" Make...