sed branching not working on OSX: undefined label-CodePudding

I'm trying to adapt the answer from https://stackoverflow.com/a/66365284/1236401 that adds control flow to provide match status code:

cat file.txt | sed 's/1/replaced-it/;tx;q1;:x'

It works as expected on Ubuntu and Alpine, but fails on Mac OSX (11.6), using any shell.

sed: 1: "s/1/replaced-it/;tx;q1;:x": undefined label 'x;q1;:x'

All references I could find to sed misbehaving on OSX were for in-place file edit, which is not the case here.

CodePudding user response：

Commands in sed are separated primarily by newlines.

| sed 's/1/replaced-it/
  tx
  q1
  :x
'

Alternatively:

sed -e 's/1/replaced-it/' -e 'tx' -e 'q1' -e ':x'

Additionally q1 is a GNU sed extension - it's not supported in every sed. It has to be removed, refactored, or you have to install GNU sed.

Overall, write it in awk, python or perl.

CodePudding user response：

Here is an Awk refactoring.

awk '/1/ { sub("1", "replaced-it", $0); replaced=1 } 1
    END { exit 1-replaced }' file.txt

Notice also how the cat is useless (with sed too, and generally any standard Unix command except annoyingly tr).