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Full Discussion: Compare the system date with date from a text file
Top Forums Shell Programming and Scripting Compare the system date with date from a text file Post 302992008 by drysdalk on Monday 20th of February 2017 02:15:04 PM
Old 02-20-2017
Hi,

(Edit: I'd initially typo'd the "2 days" as "2 months" in the output routine. Fixed now, sorry.)

I think I have a solution for you. The script is:

Code:
#!/bin/bash
file_string=`/bin/cat date.txt | /usr/bin/awk '{print $5,$4,$7,$6,$8}'`
file_date=`/bin/date -d "$file_string"`
file_epoch=`/bin/date -d "$file_string" +%s`
now_epoch=`/bin/date +%s`

if [ "$file_epoch" -gt "$now_epoch" ]
then
        #let difference=$file_epoch-$now_epoch
        difference=`/usr/bin/expr $file_epoch - $now_epoch`
elif [ "$now_epoch" -gt "$file_epoch" ]
then
        #let difference=$now_epoch-$file_epoch
        difference=`/usr/bin/expr $now_epoch - $file_epoch`
else
        let difference=0
fi

if [ "$difference" -ge "172800" ]
then
        echo "More than 2 days between $file_date and now"
else
        echo "Less than 2 days between $file_date and now"
fi

You'll notice that above the 'eval' lines (a command I'm using to do the arithmetic here) there are also commented-out lines using Bash's own built-in 'let' command, which can also do arithmetic. If you don't have 'expr' on your system, then you can comment out or remove the 'expr' lines and go with the 'let' lines instead. I've tested it with both, and (for this one single test input file, it must be noted) all was well.

Here is a transcript of a sample session, using the exact test date string you provided as the input in 'date.txt'.

Code:
$ cat date.txt
Not After : Jul 28 14:09:57 2017 GMT
$ ./script.sh
More than 2 days between Fri 28 Jul 15:09:57 BST 2017 and now
$

Hope this helps.
This User Gave Thanks to drysdalk For This Post:
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LEARN ABOUT LINUX

bzexe

BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME

       bzexe - compress executable files in place

SYNOPSIS

       bzexe [ name ...  ]

DESCRIPTION

       The  bzexe  utility  allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a
       penalty in performance).  For example if you execute ``bzexe /bin/cat'' it will create the following two files:
	   -r-xr-xr-x  1 root  bin   9644 Feb 11 11:16 /bin/cat
	   -r-xr-xr-x  1 bin   bin  24576 Nov 23 13:21 /bin/cat~
       /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file.  You can remove /bin/cat~ once  you  are	sure  that
       /bin/cat works properly.

       This utility is most useful on systems with very small disks.

OPTIONS

       -d     Decompress the given executables instead of compressing them.

SEE ALSO

       bzip2(1), znew(1), zmore(1), zcmp(1), zforce(1)

CAVEATS

       The  compressed	executable  is a shell script. This may create some security holes. In particular, the compressed executable relies on the
       PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep).

BUGS

       bzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually  in  some  cases,
       using chmod or chown.

																	  BZEXE(1)
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