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# 8  
Old 03-09-2010
[QUOTE=alister;302402300]
Code:
printf '%s\n' "$@" | cat file - | xargs -d"\n" command

Neat! I didn't know that behavior of printf (from the Bash manual: "format is reused as necessary to consume all of the arguments").

You'll acknowledge, however, that this is not a exact str.join() because it appends the separator at the end. But just about what we needed in this case.

Quote:
Originally Posted by alister
That will work fine so long as none of the positional parameters in $@ contain an embedded newline, which is probably an unlikely scenario (all the other solutions in this thread are similarly flawed).
Yes, (tacit) initial assumption was that we don't have newlines in our data domain. That should cover most scenarios (why UNIX allowed newlines in filenames, I'll never know).
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LEARN ABOUT NETBSD

shuffle

SHUFFLE(1)						    BSD General Commands Manual 						SHUFFLE(1)

NAME

     shuffle -- print a random permutation of the command line arguments

SYNOPSIS

     shuffle [-0] [-f filename ...] [-n number] [-p number] [arg] [...]

DESCRIPTION

     The shuffle program prints a random permutation (or ``shuffle'') of its command line arguments.  This can be useful in shell scripts for
     selecting a random order in which to do a set of tasks, view a set of files, etc.

     If the -f option is given, the data is taken from that files' contents or if the filename is - ``stdin''.

     If the -n option is given, its argument is treated as a number, and the program prints a random permutation of the numbers greater than or
     equal to 0 and less than the argument.

     If the -p option is given, its argument is treated as a number, and the program prints that number of randomly selected lines or arguments in
     a random order.

     The -0 option changes the field separator character from 
 to , so that the output is suitable to be sent to xargs(1) (to handle filenames
     with whitespace in them).

EXAMPLES

	   $ shuffle a b c d
	   c
	   b
	   d
	   a
	   $ shuffle -p 1 a b c d
	   d
	   $ shuffle -n 4 -p 2
	   0
	   3

SEE ALSO

     jot(1), random(6)

HISTORY

     The shuffle program first appeared in NetBSD 1.4.

AUTHORS

     Written by Perry E. Metzger <perry@piermont.com>.

BSD
								 February 18, 2009							       BSD