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Full Discussion: Connected time on UNIX
Top Forums UNIX for Advanced & Expert Users Connected time on UNIX Post 302884392 by MadeInGermany on Monday 20th of January 2014 07:30:50 AM
Old 01-20-2014
Hmm, date calculation can become complicated.
GNU date has
Code:
date --date "-1 days"
date --date "-2 days"

On standard Unix you should have a look at
Yesterdays Date/Date Arithmetic | Unix Linux Forums | Answers to Frequently Asked Questions
An example to check the current process' etime against the two previous days:
Code:
etime=`ps -p $$ -o etime=`
case $etime in
(*-*) edays=${etime%-*};;
(*) edays=0;;
esac
if [ $edays -eq 1 -o $edays -eq 2 ]; then
  echo "the current process is 1-2 days old"
fi

NB some of these expressions only work in Posix shells (ksh, bash, zsh).

Last edited by MadeInGermany; 01-20-2014 at 08:36 AM.. Reason: bug fix
 

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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)
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