sed
sed can be used to replace text in a file.
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sed -i 's/old-string/new-string/g' file-name.txt |
g = Global, replace everything in a file.
s = substitute text
-i = update the file.
Delete lines matching string
To delete lines having a string and print result.
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sed '/string to match/d' file-name.txt |
To update the file, use -i option
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sed -i '/string to match/d' file-name.txt |