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Top Forums Shell Programming and Scripting How can I extract digits at the end of a string in UNIX shell scripting? Post 303026270 by bakunin on Friday 23rd of November 2018 04:34:12 AM
Old 11-23-2018
Quote:
Originally Posted by mingch
I tried to create the following scripts but it can't increment the last number from 012 to 013, anyone help? Many thanks.
The reason is that "012" is not a number. "12" is a number and you can increment that to "13". But "012" and "013" are strings and you cannot do calculations with strings.

You haven't told us yet what your shell is and in fact it didn't matter that much because what we did up to now was common ground to all of them. We are leaving this area and maybe i will tell you something you can't use because you have a different shell - which is why you should always state what your environment (OS and shell and their versions most prominently) is.

In Korn shell (ksh) you can use typeset to make a variable have leading zeroes and having a certain length like this (try it on the command line):

Code:
$ typeset -RZ3 variable=12
$ echo $variable
012
$ (( variable += 1 ))
$ echo $variable
013

Variables in shell do not really have a certain "type". Of course it will lead to an error if you try to multiply "abc" by 3 but if you create a string "ab12cd", then somehow (you now know how) get rid of the characters you can multiply the remaining "12" and it will give you "60", which you still can use as a string. What we did above was to create a string, right-aligned (-R) in the length of 3 where every "free"space is filled with zeroes. When we calculate with it like a number, the shell will silently drop the leading zeroes to make the number "12" from "012", then do the calculation and, when writing the result back, realign and refill it (because of the typeset directive, so that "013" is the final content.

I hope this helps.

bakunin
This User Gave Thanks to bakunin 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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