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Top Forums Shell Programming and Scripting Shell script to find the sum of argument passed to the script Post 302672007 by tukuyomi on Sunday 15th of July 2012 03:24:49 PM
Old 07-15-2012
Code:
#!/bin/bash
sum=0
for i in $@; do sum=$((sum+i)); done
echo $sum
exit 0

Code:
~/unix.com$ bash script 4 5 6 7
22

See man bash for more infos
Quote:
((expression))
The expression is evaluated according to the rules described
below under ARITHMETIC EVALUATION. If the value of the expres-
sion is non-zero, the return status is 0; otherwise the return
status is 1. This is exactly equivalent to let "expression".
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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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