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Full Discussion: Subtract 2 days from timestamp
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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LEARN ABOUT SUNOS

endusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)
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