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Full Discussion: Largest number in array. Help!
Top Forums Shell Programming and Scripting Largest number in array. Help! Post 302610827 by chapeupreto on Wednesday 21st of March 2012 10:14:12 PM
Old 03-21-2012
Hi folks.
Quote:
You need to set big to something real, not $1. Safe to set to first value of the array.
You're right. That's the key.
Just for studying purposes, I've created two bash scripts using different for loop syntax for solving this problem.

Here we go:

Code:
#!/opt/local/bin/bash
# rod@wgo.com.br
# get the biggest number in an array of integers

declare -a list # array of integers
declare -i size # size of the array
declare -i biggest # biggest number of the array
declare -i current # current element of the array

read -a list -p "Enter each integer element separated by white spaces: " 
size=${#list[@]}

biggest=${list[0]} # first element of the array is supposed to be the biggest one
for ((i=1; i<$size; i++)); do # loop through the array ( this syntax  is kind of similar to the for loop used by the C programming language )
    current=${list[$i]} # get the current element of the array. This way  you don't have to worry too much about bash syntax for accessing  elements is an array
    if [ $current -gt $biggest ]; then
        biggest=$current
    fi
done

echo -e "\nThe biggest integer number in the array is: $biggest";

Code:
#!/opt/local/bin/bash
# rod@wgo.com.br
# get the biggest number in an array of integers

declare -a list # array of integers
declare -i biggest # biggest number of the array
declare -i current # current element of the array

read -a list -p "Enter each integer element separated by white spaces: " 
size=${#list[@]}

biggest=${list[0]} # first element of the array is supposed to be the biggest one
for current in ${list[@]}; do # loop through the array
    if [ $current -gt $biggest ]; then
        biggest=$current
    fi
done

echo -e "\nThe biggest integer number in the array is: $biggest";

Of course, there is more than a way for doing such things.
I suggest you give "Advanced Bash-Scripting Guide" a try. It's a really good and powerful book about Bash Scripting. You may download it for free here:
Code:
http://www.tldp.org/guides.html

Hope it helps.
This User Gave Thanks to chapeupreto For This Post:
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LEARN ABOUT OPENDARWIN

set

set(n)							       Tcl Built-In Commands							    set(n)

__________________________________________________________________________________________________________________________________________________

NAME

       set - Read and write variables

SYNOPSIS

       set varName ?value?
_________________________________________________________________

DESCRIPTION

       Returns	the  value  of	variable  varName.   If value is specified, then set the value of varName to value, creating a new variable if one
       doesn't already exist, and return its value.  If varName contains an open parenthesis and ends with a close parenthesis, then it refers	to
       an  array  element:  the characters before the first open parenthesis are the name of the array, and the characters between the parentheses
       are the index within the array.	Otherwise varName refers to a scalar variable.	Normally, varName is unqualified  (does  not  include  the
       names of any containing namespaces), and the variable of that name in the current namespace is read or written.	If varName includes names-
       pace qualifiers (in the array name if it refers to an array element), the variable in the specified namespace is read or written.

       If no procedure is active, then varName refers to a namespace variable (global variable if the current namespace is the global  namespace).
       If  a  procedure  is active, then varName refers to a parameter or local variable of the procedure unless the global command was invoked to
       declare varName to be global, or unless a variable command was invoked to declare varName to be a namespace variable.

SEE ALSO

       expr(n), proc(n), trace(n), unset(n)

KEYWORDS

       read, write, variable

Tcl																	    set(n)
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