Column value change script

I would like to create a bash script that can replace the last column value with text.

test data
Rob;Wright;20;PC;2015;Type;2
Rob;Wright;20;PC;2015;Type;4
Rob;Wright;20;PC;2015;Type;5

wanted output
Rob;Wright;20;PC;2015;Type;fire
Rob;Wright;20;PC;2015;Type;water
Rob;Wright;20;PC;2015;Type;earth

I believe I could use awk or sed to this but not sure where to begin. Can you someone point me in the right direction.

 awk '/regexp/{gsub(/foo/, "bar")};{print}' file.txt
DOCDGAAsked:
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TintinConnect With a Mentor Commented:
You could use sed, but not as flexible as awk/perl.

sed -e "s/2$/fire/" -e "s/4$/water/" -e "s/5$/earth/  filename

or put all the sed commands into a file, eg:

s/2$/fire/
s/4$/water/
s/5$/earth/

And invoke with

sed -f myfile.sed filename
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ozoCommented:
awk -F';' 'BEGIN{OFS=FS;e[2]="fire";e[4]="water";e[5]="earth"}{$7=e[$7];print}'
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DOCDGAAuthor Commented:
Tried this solution
awk -F';' 'BEGIN{OFS=FS;e[2]="fire";e[4]="water";e[5]="earth"}{$7=e[$7];print}' file.txt
Output:
Rob;Wright;20;PC;2015;Type;fire
Rob;Wright;23;PC;2015;Tyep;water
Robi;werwea;43;ibb;3424;tt;earth
;;;;;;
;;;;;;
;;;;;;
Don't know why I'm receiving extra semicolons
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ozoCommented:
Were there extra blank lines in file.txt ?

If not all lines contain 7 fields, you may prefer something like
awk -F';' 'BEGIN{OFS=FS;e[2]="fire";e[4]="water";e[5]="earth"}{$NF=e[$NF]}1' file.txt
or
awk -F';' 'BEGIN{OFS=FS;e[2]="fire";e[4]="water";e[5]="earth"}e[$NF]{$NF=e[$NF]}1' file.txt
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