Use the first position of a value in a field to replace the field

Use the first position of a field and replace the field with this value.

This is a comma separated file.  In the third field replace the word dog with d



would i use cut to to this?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Use "awk":

awk -F, 'BEGIN {OFS=","} {$3=substr($3,1,1);print}' inputfile.csv > newfile.csv

or "sed", if you prefer:

sed -i.bak 's/\(^[^,]*,[^,]*,\)\([^,]\)[^,]*\(.*$\)/\1\2\3/' inputfile.csv

The above "sed" command will create an unchanged backup file "inputfile.csv.bak" and then change "inputfile.csv" in place.

"awk" (first solution above) cannot change files "in place", so we must create a new outputfile.

"cut" cannot do what you desire.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
bjeAuthor Commented:
Thank you
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Shell Scripting

From novice to tech pro — start learning today.