String manipulation exercise

mnanjala created the topic: String manipulation exercise

Hi Guys,

Say there is a text file inject.dat, it has 5 entries as below
PKGNAME=Project-debug
OLD_VERSION=1.0.0
NEW_VERSION=1.0.1
PRODUCT NUMBER=1
RELASE DATE=11/11/2011

How we could write shell script so I can read each line replace everything after “=”sign, with new value, example run
./inject.sh $PKGNAME $OLD_VERSION $NEW_VERSION $PRODUCT_NUMBER $RELEASE_DATE , so it should update the inject.dat with newer value what ever I give as parameter? Any idea?

Hint getopts.

rajeshkumar replied the topic: Re: String manipulation exercise
Hi praveen,

getopts is the best way to implement. I could not get much time to look into it. However, please find my quick code to implement the same. Please change the file name as needed. if time permits, tomorrow i will tell you more better way.

for line in $(< raj.txt) do if [ $# -eq 5 ] then case $line in PKGNAME=$1) eval $line ;; OLD_VERSION=$2) eval $line ;; NEW_VERSION=$3) eval $line ;; PRODUCT_NUMBER=$4) eval $line ;; RELASE_DATE=$5) eval $line ;; *) ;; esac fi done echo PKGNAME=$1 >> temp.txt
echo OLD_VERSION=$2 >> temp.txt
echo NEW_VERSION=$3 >> temp.txt
echo PRODUCT_NUMBER=$4 >> temp.txt
echo RELASE_DATE=$5 >> temp.txt

mv temp.txt raj2.txt

Regards,
Rajesh Kumar
Twitt me @ twitter.com/RajeshKumarIn

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.