grep from super slow continuous streamed log and exit once string is found without buffer
I suspect it's because kubectl hasn't exited that the shell doesn't continue on. If you look at the ps output, you'll notice that grep -m1 ... does actually exit, and doesn't exist anymore, but the rest of the pipe still exists.
So I suspect you'll need to invert this. In perl, for example, I would use open to open a pipe to kubectl, read the output until I found what I wanted, kill the child, and exit. In C, the same thing with popen. I'm not sure if bash gives quite that level of control.
For example:
perl -E 'my $pid = open my $fh, "-|", qw(perl -E), q($|++; say for 1..10; say "BOOM"; say "Sleep Infinity"; sleep 50) or die "Cannot run: $!"; while(<$fh>) { if (/BOOM/) { say; kill "INT", $pid; exit 0 } }'You'll have to replace the stuff in the open after "-|" with your own command, and the if (/BOOM/) with your own regex, but otherwise it should work.