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Full Discussion: passing variable to function
Top Forums UNIX for Dummies Questions & Answers passing variable to function Post 302113305 by cfajohnson on Thursday 5th of April 2007 12:49:58 AM
Old 04-05-2007
Quote:
Originally Posted by Knotty
I am trying to sum up numbered columns and in order to tidy up the program I have wrote a function to do the adding of some numbers. I have a problem though with passing a variable to the function in the UNIX bash shell. The function only gives the first number in the variable list and does not add the rest. Can a variable not be passed to the function or am I missing something quite obvious here. The function that I wrote and the function call is shown below;

function add_num () {
sum=0
for NUM in $1
do
sum=`expr $sum + $NUM`
done
}

I call this function by function_name Variable_name as so:
add_num $column1
add_num $column2
If you want a running total that is increased with every call to the function, don't reset sum to 0:

Code:
add_num()
{
  sum=${sum:-0} ## set to 0 only if sum is empty
  for num
  do
    sum=$(( $sum + $num ))
  done 
}

That assumes that the contents of your variable is something like:
column1="12 34 56 78 90"

If you want to add columns in a file, use awk:
Code:
awk '{
   column1 += $1
   column2 += $2
}
END {
  print "Column1: " column1
  print "Column2: " column2
}' FILE

 

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LEARN ABOUT MOJAVE

sum

sum(n)							     Cyclic Redundancy Checks							    sum(n)

__________________________________________________________________________________________________________________________________________________

NAME

       sum - Calculate a sum(1) compatible checksum

SYNOPSIS

       package require Tcl  8.2

       package require sum  ?1.1.0?

       ::crc::sum ?-bsd | -sysv? ?-format fmt? ?-chunksize size? [ -filename file | -channel chan | string ]

_________________________________________________________________

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 ?-bsd | -sysv? ?-format fmt? ?-chunksize size? [ -filename file | -channel chan | string ]
	      The command takes string data or a file name or a channel and returns a checksum value calculated using the  sum(1)  algorithm.  The
	      result is formatted using the format(n) specifier provided or as an unsigned integer (%u) by default.

OPTIONS

       -sysv  The SysV algorithm is fairly naive. The byte values are summed and any overflow is discarded. The lowest 16 bits are returned as the
	      checksum.  Input with the same content but different ordering will give the same result.

       -bsd   This algorithm is similar to the SysV version but includes a bit rotation step which provides a dependency on the order of the  data
	      values.

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

       -channel chan
	      Return  a  checksum  for	the  contents  of the specified channel. The channel must be open for reading and should be configured for
	      binary translation. The channel will no be closed on completion.

       -chunksize size
	      Set the block size used when reading data from either files or channels. This value defaults to 4096.

       -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

AUTHORS

       Pat Thoyts

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category  crc	of
       the  Tcllib  SF	Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

SEE ALSO

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

KEYWORDS

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

CATEGORY

       Hashes, checksums, and encryption

COPYRIGHT

       Copyright (c) 2002, Pat Thoyts <patthoyts@users.sourceforge.net>

crc								       1.1.0								    sum(n)
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