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Full Discussion: Syntax error in subtraction in Bash
Top Forums Shell Programming and Scripting Syntax error in subtraction in Bash Post 303040006 by wisecracker on Monday 21st of October 2019 01:35:04 PM
Old 10-21-2019
I am assuming you are using bash or perhaps a POSIX shell like dash.
Your error is telling you that it is not possible to do such a task as these shells have INTEGER arithmetic only.

If you need floating/fixed point arithmetic then you will have to do workarounds using, bc, dc, python, perl, awk or any other methods that are capable of such mechanisms.

(Just an observation, you have both, ${barr1[$i]} and also ${harr1[j]} are these correct?)

EDIT:
Note the second one should have ${harr1[$j]}

An example longhand using INTEGER arithmetic and FIXED point, OSX 10.14.6, default bash terminal:
Code:
Last login: Mon Oct 21 18:25:40 on ttys000
AMIGA:amiga~> x=.098765
AMIGA:amiga~> y=10.3
AMIGA:amiga~> x=$( printf "%.f" ${x}e+12 )
AMIGA:amiga~> y=$( printf "%.f" ${y}e+12 )
AMIGA:amiga~> printf "%.12f\n" $(( y - x ))e-12
10.201235000000
AMIGA:amiga~> _

Last edited by wisecracker; 10-21-2019 at 02:50 PM.. Reason: See EDIT:
These 3 Users Gave Thanks to wisecracker For This Post:
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LEARN ABOUT NETBSD

osiop

OSIOP(4)						   BSD Kernel Interfaces Manual 						  OSIOP(4)

NAME

     osiop -- Symbios/NCR 53C710 SCSI driver

SYNOPSIS

   arc
     osiop* at jazzio? flags 0x00000

   ews4800mips
     osiop* at sbdio? flags 0x00000

   hp700
     osiop0 at gsc? flags 0x00000

   mvme68k
     osiop0 at pcctwo? ipl 2

     scsibus* at osiop?

DESCRIPTION

     The osiop driver provides support for the Symbios/NCR 53C710 SCSI controller chip.

     For the Symbios/NCR 53C700 SCSI host adapters, use the oosiop(4) driver.

     For the Symbios/NCR 53C8xx PCI SCSI host adapters, use the siop(4) or esiop(4) driver.

CONFIGURATION

     The osiop driver supports the following flags for use in config(1) files:

     bits 0-7:	 disable disconnect/reselect for the corresponding SCSI target
     bits 8-15:  disable synchronous negotiation for SCSI target
     bits 16:	 disable DMA interrupts

     "Target" is synonymous with SCSI ID number.

     Note that SCSI tape drives should be allowed to perform disconnect/reselect or performance will suffer.

SEE ALSO

     cd(4), ch(4), esiop(4), intro(4), oosiop(4), scsi(4), sd(4), siop(4), ss(4), st(4), uk(4), scsipi(9)

HISTORY

     osiop driver first appeared in NetBSD 1.6.

     The original NCR 53C710 driver appeared in NetBSD 1.0 amiga port, and Izumi Tsutsui <tsutsui@NetBSD.org> modified the driver and made it
     machine-independent.

BSD
								   May 12, 2001 							       BSD
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