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Top Forums Shell Programming and Scripting Compare the system date with date from a text file Post 302992020 by Chubler_XL on Monday 20th of February 2017 04:04:58 PM
Old 02-20-2017
@drysdalk

Your solution is functional but can I make a few suggestions to help improve it.

Code:
file_string=`/bin/cat date.txt | /usr/bin/awk '{print $5,$4,$7,$6,$8}'`

1. Awk can open an read files without the help of cat
2. No need to change order of the fields GNU date would accept a date in the format anyway.
3. OP requires matching on line containing "After :"

Perhaps: file_string=$(awk -F": " '/After :/ {print $2}')

Code:
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

OP is only wanting to match a filedate older than 2 days, the code above would also match filedate up to 2 days in the future.

OP was already using Arithmetic Expansion to calculate differences between epoch times.
I believe $((expression)) is superior to let as its more portable and is much better than using /usr/bin/expr as this wastes resources starting a new process and loading the expr command binary into memory to execute it.

I'd simply go with:

Code:
if (( file_epoch < now_epoch - 2*24*60*60 ))
then
 echo Date Less then 2 days
else
 echo Date Greater then 2 days
fi


Last edited by Chubler_XL; 02-20-2017 at 05:14 PM..
These 2 Users Gave Thanks to Chubler_XL For This Post:
 

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Bio::Structure::Atom(3pm)				User Contributed Perl Documentation				 Bio::Structure::Atom(3pm)

NAME
Bio::Structure::Atom - Bioperl structure Object, describes an Atom SYNOPSIS
#add synopsis here DESCRIPTION
This object stores a Bio::Structure::Atom FEEDBACK
Mailing Lists User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to one of the Bioperl mailing lists. Your participation is much appreciated. bioperl-l@bioperl.org - General discussion http://bioperl.org/wiki/Mailing_lists - About the mailing lists Support Please direct usage questions or support issues to the mailing list: bioperl-l@bioperl.org rather than to the module maintainer directly. Many experienced and reponsive experts will be able look at the problem and quickly address it. Please include a thorough description of the problem with code and data examples if at all possible. Reporting Bugs Report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution. Bug reports can be submitted via the web: https://redmine.open-bio.org/projects/bioperl/ AUTHOR - Kris Boulez Email kris.boulez@algonomics.com APPENDIX
The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _ new() Title : new() Usage : $struc = Bio::Structure::Atom->new( -id => 'human_id', ); Function: Returns a new Bio::Structure::Atom object from basic constructors. Probably most called from Bio::Structure::IO. Returns : a new Bio::Structure::Atom object x() Title : x Usage : $x = $atom->x($x); Function: Set/gets the X coordinate for an Atom Returns : The value for the X coordinate of the Atom (This is just a number, it is expected to be in Angstrom, but no garantees) Args : The X coordinate as a number y() Title : y Usage : $y = $atom->y($y); Function: Set/gets the Y coordinate for an Atom Returns : The value for the Y coordinate of the Atom (This is just a number, it is eypected to be in Angstrom, but no garantees) Args : The Y coordinate as a number z() Title : z Usage : $z = $atom->z($z); Function: Set/gets the Z coordinate for an Atom Returns : The value for the Z coordinate of the Atom (This is just a number, it is ezpected to be in Angstrom, but no garantees) Args : The Z coordinate as a number xyz() Title : xyz Usage : ($x,$y,$z) = $atom->xyz; Function: Gets the XYZ coordinates for an Atom Returns : A list with the value for the XYZ coordinate of the Atom Args : residue() Title : residue Usage : Function: No code here, all parent/child stuff via Entry Returns : Args : icode() Title : icode Usage : $icode = $atom->icode($icode) Function: Sets/gets the icode Returns : Returns the icode for this atom Args : reference to an Atom serial() Title : serial Usage : $serial = $atom->serial($serial) Function: Sets/gets the serial number Returns : Returns the serial number for this atom Args : reference to an Atom occupancy() Title : occupancy Usage : $occupancy = $atom->occupancy($occupancy) Function: Sets/gets the occupancy Returns : Returns the occupancy for this atom Args : reference to an Atom tempfactor() Title : tempfactor Usage : $tempfactor = $atom->tempfactor($tempfactor) Function: Sets/gets the tempfactor Returns : Returns the tempfactor for this atom Args : reference to an Atom segID() Title : segID Usage : $segID = $atom->segID($segID) Function: Sets/gets the segID Returns : Returns the segID for this atom Args : reference to an Atom pdb_atomname() Title : pdb_atomname Usage : $pdb_atomname = $atom->pdb_atomname($pdb_atomname) Function: Sets/gets the pdb_atomname (atomname used in the PDB file) Returns : Returns the pdb_atomname for this atom Args : reference to an Atom element() Title : element Usage : $element = $atom->element($element) Function: Sets/gets the element Returns : Returns the element for this atom Args : reference to an Atom charge() Title : charge Usage : $charge = $atom->charge($charge) Function: Sets/gets the charge Returns : Returns the charge for this atom Args : reference to an Atom sigx() Title : sigx Usage : $sigx = $atom->sigx($sigx) Function: Sets/gets the sigx Returns : Returns the sigx for this atom Args : reference to an Atom sigy() Title : sigy Usage : $sigy = $atom->sigy($sigy) Function: Sets/gets the sigy Returns : Returns the sigy for this atom Args : reference to an Atom sigz() Title : sigz Usage : $sigz = $atom->sigz($sigz) Function: Sets/gets the sigz Returns : Returns the sigz for this atom Args : reference to an Atom sigocc() Title : sigocc Usage : $sigocc = $atom->sigocc($sigocc) Function: Sets/gets the sigocc Returns : Returns the sigocc for this atom Args : reference to an Atom sigtemp() Title : sigtemp Usage : $sigtemp = $atom->sigtemp($sigtemp) Function: Sets/gets the sigtemp Returns : Returns the sigtemp for this atom Args : reference to an Atom aniso() Title : aniso Usage : $u12 = $atom->aniso("u12", $u12) Function: Sets/gets the anisotropic temperature factors Returns : Returns the requested factor for this atom Args : reference to an Atom, name of the factor, value for the factor id() Title : id Usage : $atom->id("CZ2") Function: Gets/sets the ID for this atom Returns : the ID Args : the ID _remove_residue() Title : _remove_residue Usage : Function: Removes the Residue this Atom is atttached to. Returns : Args : _grandparent() Title : _grandparent Usage : Function: get/set a symbolic reference to our grandparent Returns : Args : perl v5.14.2 2012-03-02 Bio::Structure::Atom(3pm)
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