Simple find and replace with sed

Question

I\'m trying to replace a number that is in a couple different strings in a text file. Basically it would take the form of

tableNameNUMBER
carNUMBER
         


        

Answer 1

to replace 1111 to 2222 you should probably try

cat textfile.txt | sed -e 's/1111/2222/g'

or

cat textfile.txt | sed -e 's/1111/2222/g' > output.txt

or

NUMBER=1111 ; NEWNUMBER=2222; cat textfile.txt | sed -e "s/$NUMBER/$NEWNUMBER/g"

There's no need to create separate script for such trivial task. Note "-e" switch for sed, "g" appended at the end of quoted command, and the difference between single and double quotes.