Makerere University

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How to replace a string on the 5th line of multiple text files?

sed -i '5s/.*/ Good Morning /' file{1..4}.txt


# manually specified
sed -i '5s/.*/Good morning/' file1.txt file2.txt file3.txt file4.txt

# wildcard: all files on the desktop
sed -i '5s/.*/Good morning/' ~/Desktop/*

# brace expansion: file1.txt, file2.txt, file3.txt, file4.txt
sed -i '5s/.*/Good morning/' file{1..4}.txt

How can I do a recursive find and replace from the command line?

# Recursively find and replace in files
find . -name "*.txt" -print0 | xargs -0 sed -i '' -e 's/foo/bar/g'