Bash script with addition...

mijohnst · 04-19-2007, 03:53 PM

I'm hoping one of you bash guru's gets this.

I'm grepping through some large files and adding up the occurrences of particular patterns. I've got it where it outputs the number of occurrences from each file, but how to do I get it to add them all together for a total. It's got to be pretty easy I hope. Here is what I have. Any help would be great.

Code:

read -p "What do the file names start with? : " NAME
read -p "What pattern do you want to find? : " PATTERN
LIST=`ls $NAME*.*`

echo ""
echo "############### Here is a list of files ###################"
echo ""
echo $LIST
echo ""

for name in ${LIST} ; do
	echo $name has -
	cat $name | grep -i "$PATTERN" | wc -l
	echo ""
done

exit 0

As an after thought, how do I get the count to show right after "echo $name has -" instead of below it?

Thanks again for the help guys!

ilikejam · 04-19-2007, 04:50 PM

Hi.

Something like

Code:

read -p "What do the file names start with? : " NAME
read -p "What pattern do you want to find? : " PATTERN
LIST=`ls $NAME*.*`

echo ""
echo "############### Here is a list of files ###################"
echo ""
echo $LIST
echo ""

TOTAL=0

for name in ${LIST} ; do
        THISFILE=`cat $name | grep -i "$PATTERN" | wc -l`
        (( TOTAL += THISFILE ))
	echo "$name has - $THISFILE"
	echo ""
done

echo "Total is: $TOTAL"

exit 0

would probably do the job.

You can get echo to not put a newline at the end, by using 'echo -n' instead of 'echo'.

Obligatory link to ABSG:
http://tldp.org/LDP/abs/html/

Dave

wjevans_7d1@yahoo.co · 04-19-2007, 05:02 PM

To take your second question first:

There are two echos. One is the program. (On Slackware it's at /usr/bin/echo.) The other is the builtin bash command. They do not behave precisely the same, but in either case the -n option is what you want.

To take your first question:

bash can do arithmetic. Put the arithmetic expression $((here)).

Try this:

Code:

echo -n hi
a=5
echo $a
a=$((a+1))
echo $a

Hope this helps.

mijohnst · 04-20-2007, 10:14 AM

Thank you both! It works perfect now! Works exactly how I wanted it.