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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 303040009 by Chubler_XL on Monday 21st of October 2019 08:56:18 PM
Old 10-21-2019
Nice wisecracker. This method would rap up into a fun little bash sum function:

Code:
function sum
{
   local word exp var

   [[ "$1" = *= ]] && var="-v ${1%=}" && shift

   for word in "$@"
   do
       case "$word" in
          [0-9.]*|-[0-9.]*|+|-)
              printf -v ans "%.f" "${word}e+12" 2>/dev/null || ans=$word
              exp="$exp $ans" ;;
          *) echo "sum: $word operator not supported" >&2 ; exit 1 ;;
       esac
   done
   printf $var "%.8f\n" $(( $exp ))e-12
}

sum val= 3.58047 - .68 + .858 + -1.2
echo $val

These 2 Users Gave Thanks to Chubler_XL For This Post:
apmcd47 wisecracker
 

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LEARN ABOUT REDHAT

sum

sum(n)									sum								    sum(n)

NAME

       sum - calculate a sum(1) compatible checksum

SYNOPSIS

       package require Tcl 8.2

       package require sum ?1.0?

       ::crc::sum ?-format format? message

       ::crc::sum ?-format format? -filename file

DESCRIPTION

       This  package  provides	a Tcl-only implementation of the sum(1) command which calculates a 16 bit checksum value from the input data.  The
       BSD sum algorithm is used by default but the SysV algorithm is also available.

COMMANDS

       ::crc::sum ?-format format? message

       ::crc::sum ?-format format? -filename file
	      The command takes string data or a file name and returns a checksum value calculated using the sum(1) algorithm. The result is  for-
	      matted using the format(n) specifier provided or as an unsigned integer (%u) by default.

OPTIONS

       -filename name
	      Return a checksum for the file contents instead of for parameter data.

       -format string
	      Return the checksum using an alternative format template.

EXAMPLES

       % crc::sum "Hello, World!"
       37287

       % crc::sum -format 0x%X "Hello, World!"
       0x91A7

       % crc::sum -file sum.tcl
       13392

SEE ALSO

       sum(1), cksum(n), crc32(n)

AUTHORS

       Pat Thoyts

KEYWORDS

       sum, cksum, checksum, crc, crc32, cyclic redundancy check, data integrity, security

crc									1.0								    sum(n)
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