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    If you're going to use GNU sed specific syntax, you might as well use sed -z 's/is/us/3'. Commented Jan 29, 2015 at 11:54
  • @StéphaneChazelas -z must be some brand new feature, my GNU sed version 4.2.1 doesn't know anything about this option. Commented Jan 29, 2015 at 12:06
  • 1
    Added in 4.2.2 (2012). In your second solution, you don't need the conversion to \x0 step. Commented Jan 29, 2015 at 12:17
  • Sorry about the edit. I had not seen the original version of the question and someone had misunderstood it and edited the wrong line. I reverted to the previous version. Commented Jan 29, 2015 at 12:33
  • This worked best in situation where there were no \n and it was a bash array requiring replacing of element separator data entered by user. Commented Jul 11, 2020 at 15:04