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Full Discussion: Sorting the contents of a variable
Top Forums Shell Programming and Scripting Sorting the contents of a variable Post 303034989 by rbatte1 on Friday 10th of May 2019 12:26:28 PM
Old 05-10-2019
How about:

Code:
OPTIONS="a b c A B D"

OPTIONS=$( \
               echo "${OPTIONS}" | \
               tr " " "\n" | \
               tr "[:upper:]" "[:lower:]" | \
               sort -u | \
               tr "\n" " " \
         )

I've just broken up the lines for clarity. Does that do the job?

Not a great plan if the content of $OPTIONS is very large (a few million items) and would be terrible with any values containing a space.

Also, don't call this in a loop because of the many many processes it might create and the costs associated with that.




Robin
 

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LEARN ABOUT HPUX

mktemp

mktemp(1)						      General Commands Manual							 mktemp(1)

NAME

       mktemp - make a name for a temporary file

SYNOPSIS

       directory_name] prefix]

DESCRIPTION

       makes a name that is suitable for use as the pathname of a temporary file, and writes that name to the standard output.	The name is chosen
       such that it does not duplicate the name of an existing file.  If the option is specified, a zero-length file is created with the generated
       name.

       The  name generated by is the concatenation of a directory name, a slash the value of the environment variable truncated to - 6 characters,
       and the process ID of the invoking process.

       The directory name is chosen as follows:

	      1.   If the option is specified, directory_name is used.

	      2.   Otherwise, if the environment variable is set and a string that would yield a unique name can be obtained by using the value of
		   that variable as a directory name, this value is used.

	      3.   Otherwise, if a string that would yield a unique name can be obtained using as the directory, is used.

	      4.   Otherwise, (current directory) is used.

       If the option is specified, prefix is used instead of the value of the environment variable for name generation.

RETURN VALUE

       returns	zero  on  successful completion and non-zero if syntax, file access, or file creation errors were encountered or a unique pathname
       could not be generated.

SEE ALSO

       mktemp(3C), umask(1).

																	 mktemp(1)
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