10-12-2016
If you mean echo *
Then it's actually the shell that's doing it, not echo. It happens before the command is run. * is a wildcard which expands to all files in the current directory. It will happen with any command. It will not necessarily do anything sensible with every command, of course... it just dumps in filenames as arguments.
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LEARN ABOUT OPENDARWIN
apply
APPLY(1) BSD General Commands Manual APPLY(1)
NAME
apply -- apply a command to a set of arguments
SYNOPSIS
apply [-a c] [-d] [-#] command argument ...
DESCRIPTION
The apply utility runs the named command on each argument argument in turn.
Character sequences of the form ``%d'' in command, where 'd' is a digit from 1 to 9, are replaced by the d'th following unused argument. In
this case, the largest digit number of arguments are discarded for each execution of command.
The options are as follows:
-# Normally arguments are taken singly; the optional number -# specifies the number of arguments to be passed to command. If the number
is zero, command is run, without arguments, once for each argument.
If any sequences of ``%d'' occur in command, the -# option is ignored.
-a c The use of the character '%' as a magic character may be changed with the -a option.
-d Display the commands that would have been executed, but do not actually execute them.
ENVIRONMENT
The following environment variable affects the execution of apply:
SHELL Pathname of shell to use. If this variable is not defined, the Bourne shell is used.
EXAMPLES
apply echo a*
is similar to ls(1);
apply -2 cmp a1 b1 a2 b2 a3 b3
compares the `a' files to the `b' files;
apply -0 who 1 2 3 4 5
runs who(1) 5 times; and
apply 'ln %1 /usr/joe' *
links all files in the current directory to the directory /usr/joe.
FILES
/bin/sh default shell
AUTHORS
Rob Pike
BUGS
Shell metacharacters in command may have bizarre effects; it is best to enclose complicated commands in single quotes ('').
HISTORY
The apply command appeared in 4.2BSD.
BSD
April 4, 1994 BSD