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I need to search and replace multiple words. For example, in my file, I want to search for any name of week days that appears with a comma after it: Sat, or Sun, or Mon, or Tue, or Wed, or Thur, or Fri, to a name without comma: Saturday or Sunday or Monday or Tuesday or Wednesday or Thursday or Friday. I know how to do this one by one:

sed 's/Sat,/Saturday/g' myfile.txt > output.txt

But due to the fact that I have to check every week day in multiple files, I need to find a more efficient way to check all the names and replace them at once. I am aware this can be done through scripting but I have not worked on that before. If someone familiar with this, I can learn from it this time and do it myself next time.

  • Take a look at GNU sed's option -f and -i. See: man sed – Cyrus Jul 17 at 19:45
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You can chain multiple sed expressions like this:

sed -e 's/Sat/Saturday/g' -e 's/Sun/Sunday/g' <file>

This will replace all occurrences of Sat with Saturday and all occurrences of Sun with Sunday.

  • Why do you add -e ?? – qbq Jul 17 at 20:06
  • -e means script or --expression otherwise sed will interpret the second argument as the first <file> to use and it will error with .. can't read s/Sun/Sunday/g: No such file or directory – Nicolai Fröhlich Jul 17 at 20:09
  • How to ignore case-sensitivity in sed? because the day name may or may not be capital letter. – qbq Jul 17 at 20:12
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    use /ig or /Igat the end of the expression – Nicolai Fröhlich Jul 17 at 20:17
  • Shouldn't the search text (Sat, Sun, here) have commas after them? – Jeff Schaller Jul 17 at 21:50

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