K 10
svn:author
V 7
stefanf
K 8
svn:date
V 27
2006-06-15T07:00:49.000000Z
K 7
svn:log
V 391
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

END