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Full Discussion: Use positional parameters in loop / while syntax in whiptail
Top Forums Shell Programming and Scripting Use positional parameters in loop / while syntax in whiptail Post 303021912 by MadeInGermany on Monday 20th of August 2018 12:46:58 PM
Old 08-20-2018
Regarding the loop:

Your method would need another redirection. In bash this can be done with
Code:
x=1
 while [ $x -le 5 ]
 do
   echo "${!x}"
   x=$(( $x + 1 ))
 done

It is more common to print $1 and shift the parameters to the left ($2 -> $1, $3 -> $2,...)
Code:
x=1
while [ $x -le $# ]
do
  echo "${1}"
  x=$(( $x + 1 ))
  shift
done

Most easy: loop over the argument values with a for loop
Code:
for arg in "$@"
do
  echo "$arg"
done

In a for loop the argument values are the default:
Code:
for arg
do
   echo "${arg}"
done

 

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LEARN ABOUT OPENSOLARIS

shift

shift(1)							   User Commands							  shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       *shift [n]

   ksh
       +shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not specified, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       On this manual page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

	   1.	  Variable assignment lists preceding the command remain in effect when the command completes.

	   2.	  I/O redirections are processed after variable assignments.

	   3.	  Errors cause a script that contains them to abort.

	   4.	  Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a
		  variable assignment. This means that tilde substitution is performed after the = sign and word splitting and file  name  genera-
		  tion are not performed.

   ksh93
       shift  is  a  shell  special  built-in that shifts the positional parameters to the left by the number of places defined by n, or 1 if n is
       omitted. The number of positional parameters remaining is reduced by the number of places that are shifted.

       If n is specified, it is evaluated as an arithmetic expression to determine the number of places to shift. It is an  error  to  shift  more
       than the number of positional parameters or a negative number of places.

       The following exit values are returned by shift in ksh93:

       0     Successful completion. The positional parameters were successfully shifted.

       >0    An error occurred.

       On this manual page, ksh93(1) commands that are preceded by one or two + are treated specially in the following ways:

	   1.	  Variable assignment lists preceding the command remain in effect when the command completes.

	   2.	  I/O redirections are processed after variable assignments.

	   3.	  Errors cause a script that contains them to abort.

	   4.	  They are not valid function names.

	   5.	  Words, following a command preceded by ++ that are in the format of a variable assignment, are expanded with the same rules as a
		  variable assignment. This means that tilde substitution is performed after the = sign and field splitting and file name  genera-
		  tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), ksh(1), ksh93(1), sh(1), attributes(5)

SunOS 5.11							    20 Nov 2007 							  shift(1)
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