#!/bin/bash # Shell Script to swap values in two variables x and y # ------------------------------------------------------------------------- # Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/> # This script is licensed under GNU GPL version 2.0 or above # ------------------------------------------------------------------------- # This script is part of nixCraft shell script collection (NSSC) # Visit http://bash.cyberciti.biz/ for more information. # ------------------------------------------------------------------------- echo "Enter value for x : " read x echo "Enter value for y : " read y echo "Before swap, x = $x and y = $y" z=$x x=$y y=$z echo "After swap, x = $x and y = $y"
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This may be a simpler of all!
echo ENTER TWO VARIABLES
read a b
t=`expr $a`
a=`expr $b`
b=`expr $t`
echo EXCHANGED VARIABLES ARE $a AND $b
exit 0
a=5; b=3
read a b <<<"$b $a"
echo $a $b
hi, can you plz explain what that “<<<" sign does…? "<<" is here document and what that thirs "<" sign does…? plz help..
< input a file
<< input a "here document"
<<< input a "here string"
Try this option, we can avoid the third variable
#!/bin/bash
echo -e “Type the value of x : ”
read x
echo -e “Type the value of y : ”
read y
x=`expr $x + $y`
y=`expr $x – $y`
x=`expr $x – $y`
echo -e “The value of x :$x ”
echo -e “The value of y :$y “