Using `sed` to find and replace in file

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sed = Stream EDitor

sed find and replace text
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sed 's/word1/word2/g' input.file
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Find and replace text and save to new file
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sed 's/word1/word2/g' input.file > output.file
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Note: 
s/ means substitute
/g means global replace
Can change delimiter / to something else:
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sed 's~word1~word2~g' input.file > output.file
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Find and replace in the line contains something
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sed -i -e '/FOO/s/love/sick/' input.txt
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In this example only find the word love and replace it with the sick if line content a specific string such as FOO
Find and replace multiple files in sub-folder
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find ./ -type f -exec sed -i -e 's/apple/orange/g' {} \;
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-i  to save the temporary file
Source: https://stackoverflow.com/a/6759339​

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sed find and replace text

Can change delimiter / to something else:

Find and replace in the line contains something

Find and replace multiple files in sub-folder