Command-line arguments
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Retrieve the list of command-line arguments given to the program.
Example command line:
myprogram -c "alpha beta" -h "gamma"
Ada
Command line arguments are available through the pre-defined package Ada.Command_Line.
with Ada.Command_line; use Ada.Command_Line; with Ada.Text_IO; use Ada.Text_IO procedure Print_Commands is begin -- The number of command line arguments is retrieved from the function Argument_Count -- The actual arguments are retrieved from the function Argument -- The program name is retrieved from the function Command_Name Put(Command_Name & " "); for Arg in 1..Argument_Count loop Put(Argument(Arg) & " "); end loop; New_Line; end Print_Commands;
Perl
Interpreter: Perl v5.x
@ARGV is the array containing all command line parameters
my @params = @ARGV; my $second = $ARGV[1]; my $fifth = $ARGV[4];
Python
argv in the sys module is a list containing all command line parameters, including the program name.
import sys program_name = sys.argv[0] # gets the program name all_arguments = sys.argv[1:] # arguments, excluding the program name
Tcl
The pre-defined variable argc contains the number of arguments passed to the routine, argv contains the arguments as a list. Retrieving the second argument might look something like this:
if { $argc > 1 } { puts [lindex $argv 1] }
(Tcl counts from zero, thus [lindex $list 1] retrieves the second item in the list)
UNIX Shell
Bourne Shell
To retrieve the entire list of arguments:
WHOLELIST="$@"
To retrieve the second and fifth arguments:
SECOND=$2 FIFTH=$5