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  • I actually forgot to mention that the port will never be the same. The sed command needs to replace the old port (random 5 digit port) with one stored in $newport Commented Apr 21, 2019 at 0:20
  • @Shr00m, See revised answer. Commented Apr 21, 2019 at 0:23
  • @agc instead of trying to guess what the leading whitespace is composed of (and the exact number of spaces or tabs) you should be able to use \s*? Commented Apr 21, 2019 at 0:38
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    Further suggestion to improve upon @agc answer, this is a little more concise: sed -i -E 's/^(\s*?"peer-port":\ )[0-9]{5},/\1'"$newport"'/' settings.json Commented Apr 21, 2019 at 0:50
  • @JeffH., Well maybe, but this is a novice question and \s is both harder to explain and not always intuitive. Consider the output of this code echo foo | sed 's/\s*/\t/'; there's no visible leading whitespace in the input, but there is in the output... Also it's uncertain whether or not the OP is running GNU sed; if not then stuff like [0-9]{5} won't work. The lead ^ is an improvement in any case though. Commented Apr 21, 2019 at 0:52