02-13-2018
What operating system are you using?
---This is a Linux.
What shell do you want to use to run your shell script?
---Bash Shell
In what format will dates be entered?
---Date will be entered as YYYYMMDD whcih i have split into 3 variables.
Where will the dates be found? (Are they provided as variables in your shell script? Are they command-line parameters? Are they typed in in response to prompts? Are they found in known files? ...)
---Dates typed in response to prompts.
In what way do you want dates to be compared? (Are you just trying to determine if they specify the same date? Are you trying to determine the number of days between two dates? If your dates includes hours, minutes, and seconds; are you trying to determine the number of seconds between the two dates?).
---i Want to know the difference in Days and not using Datediff or Date. I just need to use simple if ...else and arithmetics. Also look for number of leap years
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LEARN ABOUT FREEBSD
atf-sh
ATF-SH(1) BSD General Commands Manual ATF-SH(1)
NAME
atf-sh [-s shell] -- interpreter for shell-based test programs
SYNOPSIS
atf-sh script
DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.
atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter-
preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not
use any non-standard extensions.
The following options are available:
-s shell Specifies the shell to use instead of the value provided by ATF_SHELL.
ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes.
ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes.
ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a
specific interpreter.
EXAMPLES
Scripts using atf-sh(3) should start with:
#! /usr/bin/env atf-sh
Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode
the path to atf-sh in the script and then use the -s option afterwards as a single parameter:
#! /path/to/bin/atf-sh -s/bin/bash
ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts.
SEE ALSO
atf-sh(3)
BSD
September 27, 2014 BSD