sed “undefined label” on MacOS

Question

I recently found out that this simple sed expression work fine on Linux or under Cygwin but fails on Mac with an \"undefined label\" error:

$ sed \'         


        

Answer 1

The name of the label terminates with the first literal newline, not at the semi-colon. There are two easy ways to solve the problem. Add literal newlines:

 sed '/SUCCESSFUL/d 
    /\[java\]/!b label
    s/\s\+\[java\]//
    /^\s*$$/d; /Compiling/!d
    :label
    /^\s*$$/d
    s/^/monitor: /'

Or use multiple -e options:

sed -e '/SUCCESSFUL/d ; /\[java\]/!b label' \
  -e 's/\s\+\[java\]//; /^\s*$$/d; /Compiling/!d' \
  -e':label' -e'/^\s*$$/d; s/^/monitor: /'