Variables shell script in Unix or Linux



variables:


Special variables--system defined
$0---file name
$n---$0,$1..nth
$*--all the parameters
$#---no. of arguments
$$---process id
$?---last status of the command.0--succ,non -zero--fail
$@---all the parameters seperate double quotes

user defined variables
var,a,b,c
$var
$a
$b


enviornment variables

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