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Operating Systems Solaris Subtract 2 days from timestamp Post 302981520 by drl on Wednesday 14th of September 2016 08:51:47 AM
Old 09-14-2016
Hi.

There may be a GNU date on your system:
Code:
$ which gdate
/usr/bin/gdate
$ gdate   
Wed Sep 14 07:48:45 CDT 2016

However, you could also use ksh:
Code:
#!/usr/bin/env ksh

# @(#) s1       Demonstrate date arithmetic with ksh printf.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
em() { pe "$*" >&2 ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
# C=$HOME/bin/context && [ -f $C ] && . $C
version =o version
echo ksh - ${.sh.version}

# %Y%m%d%H%M . [ex: 201609140905]
pl " Results, today:"
printf "%(%Y%m%d%H%M)T\n" now

pl " Results, 2 days ago:"
printf "%(%Y%m%d%H%M)T\n" "2 days ago"

pl " Results, almost any time:"
arbitrary_date=201409140905
printf "%(%Y%m%d%H%M)T\n" "$arbitrary_date"

pl " Results, 2 days before almost anytime:"
printf "%(%Y%m%d%H%M)T\n" "$arbitrary_date 2 days ago"

exit 0

producing:
Code:
$ ./s1
OS, ker|rel, machine: SunOS, 5.11, i86pc
Distribution        : Solaris 11.3 X86
version (local) 1.77
ksh - Version JM 93u 2011-02-08

-----
 Results, today:
201609140747

-----
 Results, 2 days ago:
201609120747

-----
 Results, almost any time:
201409140905

-----
 Results, 2 days before almost anytime:
201409120905

See man pages or Google search results for details.

Best wishes ... cheers, drl
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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