Replacing string in file Unix

Use sed to do a global substitution on file1.txt and redirect the output to file2.txt:

sed 's/apple-pie/apple_pie/g' file1.txt > file2.txt

linux string unix replace sed

sed has better performance than awk but both will work for this search and replace. Reference

If you put the commands in a script (e.g., ksh, sh) then here is the syntax:

awk '{gsub(/apple-pie/,"apple_pie");print}' "file1.txt" > "file2.txt"sed -e 's/apple-pie/apple_pie/g' "file1.txt" > "file2.txt"

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