topic Re: Script with flags in Operating System - Linux

Script with flags

Coolmar — Thu, 07 Dec 2006 14:31:37 GMT

Hi all,
I have a script that does a daily check of a file. If it finds a certain condition, it will email. However, I only want it to email twice. So it will check for flag1 and if it exists it checks for flag2. If both exist, I want it not to email. Here is what I have...it is part of a case statement:

ABCD)
if [ $pcent -lt 15 ]; then
find $TMPDIR -type f -mtime +30 -exec rm -f {} \; #if flags are older than a month remove
if [ -f $TMPDIR/$name.2 ]; then
HERE IS WHERE I AM STUCK
elif [ -f $TMPDIR/$name.1 ]; then
touch $TMPDIR/$name.2
else
touch $TMPDIR/$name.1
fi
mail -t $maila <Subject: $mailsubj
From: $name
Cc: $dbagroup
message body
EOF
fi
;;

DEFG)
same as above
EOF
;;

So my problem is that it works great if no flags exist or only flag1. I don't know what to do when it finds both flags. I had "exit" but then the script stops and it doesn't run through the other cases. I had echo "nothing" to /dev/null but then it still emails. I guess I could put the whole email spiel in each if statement, but just thought I would check with you guys to see if there is something much simpler I could be doing.

Thanks!

Re: Script with flags

Peter Nikitka — Thu, 07 Dec 2006 14:41:56 GMT

Hi,

I would just set a condition to send mail or not in the check routines and check that condition later. E.g.:
...
ABCD)
if [ $pcent -lt 15 ]; then
find $TMPDIR -type f -mtime +30 -exec rm -f {} \; #if flags are older than a month remove
sendit=y # preset condition
if [ -f $TMPDIR/$name.2 ]; then
sendit= # change condition
elif [ -f $TMPDIR/$name.1 ]; then
touch $TMPDIR/$name.2
else
touch $TMPDIR/$name.1
fi
# check condition
[ "$sendit" ] &&
mail -t $maila <Subject: $mailsubj
From: $name
Cc: $dbagroup
message body
EOF
fi
;;
...

mfG Peter

Re: Script with flags

James R. Ferguson — Thu, 07 Dec 2006 14:49:39 GMT

Hi:

There are several ways here. One way is to rearrange your code similar to:

...
if [ ! -f "$name.1" ]; then
touch $name.1
elif [ ! -f "$name.2" ]; then
touch $name.2
else
mail ...
fi

Regards!

...JRF...

Re: Script with flags

A. Clay Stephenson — Thu, 07 Dec 2006 14:50:21 GMT

You need to discover the shell's logical and and logical or:

Classic syntax:

if [ -f ${TMPDIR}/${name}.1 -o -f ${TMPDIR}/${name}.2 ] # -o => OR
then
# at least one file was found
else
if [ -f ${TMPDIR}/${name}.1 -a -f ${TMPDIR}/${name}.2 ] # -a => AND
then
# both were found
else
if [ -f ${TMPDIR}/${name}.1 ]
then
# only file1 was found
else
# only file2 was found
fi
fi
else
# No files were found
fi

Newer more efficient equivalent syntax for Korn and POSIX shell syntax (Note the double ]]'s and [['s meaning the shell evaluates internally rather than using the external test command.):

if [[ -f ${TMPDIR}/${name}.1 || -f ${TMPDIR}/${name}.2 ]] # || => OR
then
# at least one file was found
else
if [[ -f ${TMPDIR}/${name}.1 && -f ${TMPDIR}/${name}.2 ]] # && => AND
then
# both were found
else
if [[ -f ${TMPDIR}/${name}.1 ]]
then
# only file1 was found
else
# only file2 was found
fi
fi
else
# No files were found
fi

Re: Script with flags

Coolmar — Fri, 08 Dec 2006 09:57:44 GMT

Thanks guys...that helped alot!