Stefan Farfeleder 120c8e6c34 Implement the PS4 variable which is defined by the POSIX User Portability
Utilities option.  Its value is printed at the beginning of the line if tracing
(-x) is active.  PS4 defaults to the string "+ " which is compatible with the
old behaviour to always print "+ ".

We still need to expand variables in PS1, PS2 and PS4.

PR:		46441 (part of)
Submitted by:	schweikh
Obtained from:	NetBSD
2006-06-15 07:00:49 +00:00
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