if [ $NOWDATE -gt $STARTDATE ] , date comparison correct syntax? Post: 302369356

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Top Forums Shell Programming and Scripting if [ $NOWDATE -gt $STARTDATE ] , date comparison correct syntax? Post 302369356 by durden_tyler on Saturday 7th of November 2009 05:24:01 PM

11-07-2009

Registered User

Quote:

Originally Posted by danpaluska

...

Code:

# a bunch of initializition steps are here ...
STARTDATE=`date +%Y%m%d`
 
while [ 1 ] # loop running all the time. 
do

NOWDATE=`date +%Y%m%d`

# if day changes then i want to reinitialize
if [ $NOWDATE -gt $STARTDATE ] 
then
# do all that initiallization again 
fi

# ... a bunch of other code in here

done

but that if statement doesn't work. any tips?
...

Did you wait long enough ?

The value of NOWDATE will change when the day changes. So if you start your script and keep it running till midnight (when the day changes), the "if" condition will return true thereafter.

Code:

$
$ cat -n t1.sh
     1  #!/bin/bash
     2
     3  # a bunch of initializition steps are here ...
     4  STARTDATE=`date +%Y%m%d`
     5  echo "STARTDATE = $STARTDATE"
     6
     7  NOWDATE=`date +%Y%m%d`
     8  if [ $NOWDATE -gt $STARTDATE ]; then
     9    echo "in if (-gt)  : NOWDATE = $NOWDATE"
    10  else
    11    echo "in else (-le): NOWDATE = $NOWDATE"
    12  fi
    13
    14  NOWDATE="20091108"
    15  if [ $NOWDATE -gt $STARTDATE ]; then
    16    echo "in if (-gt)  : NOWDATE = $NOWDATE"
    17  else
    18    echo "in else (-le): NOWDATE = $NOWDATE"
    19  fi
    20
$
$ . t1.sh
STARTDATE = 20091107
in else (-le): NOWDATE = 20091107
in if (-gt)  : NOWDATE = 20091108
$
$

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shtool-echo

SHTOOL-ECHO.TMP(1)					      GNU Portable Shell Tool						SHTOOL-ECHO.TMP(1)

NAME

       shtool-echo - GNU shtool echo(1) extensional command

SYNOPSIS

       shtool echo [-n|--newline] [-e|--expand] string

DESCRIPTION

       shtool echo is an echo(1) style command which prints string to stdout and optionally provides special expansion constructs (terminal bold
       mode, environment details, date, etc) and newline control. The trick of this command is that it provides a portable -n option and hides the
       gory details needed to find out the environment details under option -e.

OPTIONS

       The following command line options are available.

       -n, --newline
	   By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is
	   omitted.

       -e, --expand
	   If option -e is used, string can contain special "%x" constructs which are expanded before the output is written. Currently the
	   following constructs are recognized:

	   %B  switch terminal mode to bold display mode.

	   %b  switch terminal mode back to normal display mode.

	   %u  the current user name.

	   %U  the current user id (numerical).

	   %g  the current group name.

	   %G  the current group id (numerical).

	   %h  the current hostname (without any domain extension).

	   %d  the current domain name.

	   %D  the current day of the month.

	   %M  the current month (numerical).

	   %m  the current month name.

	   %Y  the current year.

EXAMPLE

	#   shell script
	shtool echo -n -e "Enter your name [%B%u%b]: "; read name
	shtool echo -e "Your Email address might be %u@%h%d"
	shtool echo -e "The current date is %D-%m-%Y"

HISTORY

       The GNU shtool echo command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Website META Language (WML)
       under the name buildinfo. It was later taken over into GNU shtool.

SEE ALSO

       shtool(1), echo(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-ECHO.TMP(1)