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I've had a few problems with systemd and a very simple start/stop script too. I was asked to set something that that was not a true service to run at boot time. After much testing and tracing, the...

Something like # config for systemd
...
ExecStart=/path/to/collector2.sh
...

where collector2.sh is #!/bin/bash

. $HOME/.pgprofile_pgwatch2
# Redirect standard output into logfile
exec >>...

This is because the exit command is executed in a subshell (the right hand side of the pipeline). So the subshell is exited, but not the parent shell.

If you were to use ksh (Korn Shell) or zsh ,...

That's not how a traditional regex works, you describe what you want, not what you don't want.

Only thing I can think is PERL regexes which have all sorts of fancy extra features which may include...