08-28-2001
Here is one way:
#!/usr/bin/sh
_day=`date +%d`
_month=`date +%m`
_year=`date +%y`
newday=`expr $_day - 2`
echo "Two days ago was $_month/$newday/$_year "
I know the GNU date provides an easier way, but this is more portable...
your to_char function is up to you :P
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LEARN ABOUT CENTOS
pmdate
PMDATE(1) General Commands Manual PMDATE(1)
NAME
pmdate - display an offset date
SYNOPSIS
pmdate [ offset ... ] format
DESCRIPTION
pmdate displays the current date and/or time, with an optional offset.
An offset is specified with a leading sign (``+'' or ``-''), followed by an integer value, followed by one of the following ``scale'' spec-
ifiers;
S seconds
M minutes
H hours
d days
m months
y years
The output format follows the same rules as for date(1) and strftime(3).
For example, the following will display the date a week ago as DDMMYYYY;
pmdate -7d %d%m%Y
PCP ENVIRONMENT
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the
file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configura-
tion file, as described in pcp.conf(5).
SEE ALSO
date(1), strftime(3), pcp.conf(5) and pcp.env(5).
Performance Co-Pilot PCP PMDATE(1)