"yesterdate" function?

[Jean-Pierre Radley]

In article <19100001 at hpficad.HP.COM> mcr at hpficad.HP.COM (Matt Reprogle) writes:
>I need a way to get yesterday's date in YYMMDD format in a Unix script and put
>it in a file.   I don't want to write a C program implementing an entire
>calendar to do it. 

The C program exists: "datecalc", written by Fred Buck, and available
in the LIBraries of the TANGENT Forum on Compuserve. It'll solve that
problem, and do dozens of other little date routines. Anyone not on CIS,
E-mail me.

But to just solve the one little problem posed by Matt:

	GMTDIFF=`echo $TZ | sed 's/[^0-9]*//g'`
	YESTGMTDIFF=`expr $GMTDIFF + 24`
	TZY=`echo $TZ | sed 's/[0-9][0-9]*/'$YESTGMTDIFF'/'`
	YESTERDATE=`TZ=$TZY date +%y%m%d`

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Jean-Pierre Radley		Honi soit		jpr at dasys1.UUCP
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