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Full Discussion: perl: a way to see a sub code in debug mode: perl -de 0 ?
Top Forums Shell Programming and Scripting perl: a way to see a sub code in debug mode: perl -de 0 ? Post 302489670 by Perderabo on Friday 21st of January 2011 07:49:57 AM
Old 01-21-2011
I have reviewed the debugger section in Larry Wall's Programming Perl book. He does come out and explicitly say why S and l are so named. Reading between the lines, I think that "S" might stand for "subroutines" and "l" seems to be chosen from "listing".
 

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LEARN ABOUT X11R4

systemd-debug-generator

SYSTEMD-DEBUG-GENERATOR(8)				      systemd-debug-generator					SYSTEMD-DEBUG-GENERATOR(8)

NAME

       systemd-debug-generator - Generator for enabling a runtime debug shell and masking specific units at boot

SYNOPSIS

       /lib/systemd/system-generators/systemd-debug-generator

DESCRIPTION

       systemd-debug-generator is a generator that reads the kernel command line and understands three options:

       If the systemd.mask= option is specified and followed by a unit name, this unit is masked for the runtime, similar to the effect of
       systemctl(1)'s mask command. This is useful to boot with certain units removed from the initial boot transaction for debugging system
       startup. May be specified more than once.

       If the systemd.wants= option is specified and followed by a unit name, a start job for this unit is added to the initial transaction. This
       is useful to start one or more additional units at boot. May be specified more than once.

       If the systemd.debug_shell option is specified, the debug shell service "debug-shell.service" is pulled into the boot transaction. It will
       spawn a debug shell on tty9 during early system startup. Note that the shell may also be turned on persistently by enabling it with
       systemctl(1)'s enable command.

       systemd-debug-generator implements systemd.generator(7).

SEE ALSO

       systemd(1), systemctl(1), kernel-command-line(7)

systemd 237														SYSTEMD-DEBUG-GENERATOR(8)
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