replacing text in file

[kirstenx]

I'm very new to AWK. Who can help me with a simple code to do this:
Read a file temp.txt
If the file contains the word "apple", change all words "red" into the word "blue" and if the file contains the word "berry", change all words "yellow" into the word "green"
Overwrite the file temp.txt

Regards,
kirstenx

 

[dioid]

AWK isn't best used to do "inplace" substitutions in files. The closest to that would be something like redirecting the output to a tmp file, and then over-write the original...

#!/bin/bash
# awk.sh
infil="./awk.data"
awk '/apple/ { gsub(/red/, "blue") } /berry/ { gsub(/yellow/, "green") }1' $infil >  "$infil.tmp" && cp "$infil.tmp" $infil

 

[johnherman]

Here's a solution, but it might not be allowed if the instructor specifically wants you to use awk. Grep for "apple" or whatever the keyword is in the file. If grep finds apple, use sed to do a global replace within the file. Same for "berry". Else don't do anything.

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