Bash shell script: Str(007) to int(7),increment it(8) & convert back to string(008)

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# 1  
Old 12-01-2011
Bug Bash shell script: Str(007) to int(7),increment it(8) & convert back to string(008)

I have the following requirement.

There will be following text/line in a file (eg: search-build.txt)

I need to update the incremental build number (eg here 007) every time I give a build through script. I am able to search the string and get the item.
var2=`grep -sn $rexpression_sed search-build.txt | sed -e 's/'$rexpression_sed'/\1\t\2\t\3\t\4/g'| cut -f 3`
echo $var2

How to convert this to integer (7), add 1 to it (8) and again get back in the same form (008) in the easiest way? I will be using sed -i on the file, with this new string that can be used with RE for replacing that part!
Is there any better method than above.

Thanks for any help.
# 2  
Old 12-01-2011
$ PRODUCT_VERSION="V:01.002.007.Build1234"
$ printf "%03d" $(expr $(echo $PRODUCT_VERSION | cut -d. -f3) + 1)

This User Gave Thanks to balajesuri For This Post:
# 3  
Old 12-01-2011
echo V:01.002.007.Build1234 | awk -F . '{print "00"$3+1}'

This User Gave Thanks to funksen For This Post:
# 4  
Old 12-01-2011
thanks a lot

---------- Post updated at 09:56 PM ---------- Previous update was at 09:49 PM ----------

Re: Bash shell script: Str(007) to int(7),increment it(Image & convert back to string(00
thanks solved

incrementnum=`grep -sn $rexpression_sed $filename | sed -e 's/'$rexpression_sed'/\1\t\2\t\3\t\4/g'| cut -f 3`
echo "Current Incremental number is: " $incrementnum
if [ $incrementnum ]
calcval=$(expr $incrementnum + 1)
#echo $calcval
if [ $calcval -le 9 ];
elif [ $calcval -le 99 ];
echo "New Incremental number is: " $newval
#replace with new number
sed -i 's/'$rexpression_sed'/'$rexpression_rep_final'/' $filename
# 5  
Old 12-01-2011
Originally Posted by balajesuri
$ PRODUCT_VERSION="V:01.002.007.Build1234"
$ printf "%03d" $(expr $(echo $PRODUCT_VERSION | cut -d. -f3) + 1)

In modern versions of bash you do not need to use expr, i.e.
 printf "%03d" $(( $(echo $PRODUCT_VERSION | cut -d. -f3) + 1))

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