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- Inside a script the variables
$1 $2 $3 etc. store
the value of the command line arguments.
- e.g. if a script called reg_vol is executed as:
$ reg_vol im1 3 abc
then $1 = im1, $2 = 3, $3 = abc
- Other special variables are:
$0 = name of the script (often including the path)
$# = number of command line arguments given
$@ = all the command line arguments
(i.e. $1 $2 $3 ...)
$$ = process ID number (unique to this process)
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