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Top Forums Shell Programming and Scripting Adding time to date time in UNIX shell scipting Post 302738875 by cfajohnson on Monday 3rd of December 2012 04:31:02 AM
Old 12-03-2012

Brad, the %s format to date is not standard. GNU and [Free|Net]BSD have it, other variants might not.

These bash functions I just wrote do time arithmetic:
Code:
time2seconds() #@ Calculate no. of seconds from [H]H:[M]M:[S]S result_var
{
  local s hours minutes seconds var IFS=:
  set -- $*
  hours=${1#0}
  minutes=${2#0}
  seconds=${3#0}
  var=${4:-_t2s}
  s=$(( hours * 3600 + minutes * 60 + seconds ))
  printf -v "$var" "%d" "$s"
}

seconds2time() #@ Convert number of seconds to [DAYS ]HH:MM:SS
{
  local s days hours minutes seconds var
  s=$1
  var=${2:-_s2t}
  seconds=$(( s % 60 ))
  hours=$(( s / 3600 ))
  minutes=$(( (s - hours * 3600) / 60 ))

  if [ $hours -gt 24 ]
  then
    days=$(( hours / 24 ))
    hours=$(( hours % 24 ))
  fi

  printf -v "$var" "%s%02d:%02d:%02d" ${days:+"$days "} "$hours" "$minutes" "$seconds"
}

addseconds() #@ To HH:MM:SS add SECS
{
  local time=$1 secs=$2
  time2seconds "$time"
  seconds2time "$(( _t2s + secs ))"
}

They can be combined with the date functions from The Dating Game to solve your problem.
 

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sa2(8)							    BSD System Manager's Manual 						    sa2(8)

NAME
sa2 -- Generate a system activity daily report file. SYNOPSIS
/usr/lib/sa/sa2 [-dgpu] [-n mode] [-e time] [-f filename] [-i seconds] [-s time] DESCRIPTION
The sa2 command is a shell script used to invoke the system activity reporter sar for purposes of generating the standard default daily report file. The report file generated is, /var/log/sa/sardd where the dd represents the current day of the month. The sa2 options are the same as those documented in sar(1). When sa2 runs, it will also remove data and report files, found in /var/log/sa, that are more than one week old. The sa2 command is intended to be started by cron. EXAMPLE CRON ENTRY
# Starting at 8am collect system activity records # every 20 minutes for 12 hours # 20 minutes = 1200 seconds # 12 hours with 3 samples each hour = 36 loops 0 8 * * 1-5 /usr/lib/sa/sa1 1200 36 # After the 12 hour period, # collect a system activity report 30 20 * * 1-5 /usr/lib/sa/sa2 -A FILES
/var/log/sa/sardd Default daily report file. /var/log/sa/sadd Default daily data file. dd are digits that represent the day of the month. SEE ALSO
sa1(8), sadc(8), sar(1), iostat(8), vm_stat(1), netstat(1), top(1), sc_usage(1), fs_usage(1), crontab(1), crontab(5) Mac OS X Jul 25 2003 Mac OS X
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