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Full Discussion: Grep command is not working
Top Forums UNIX for Beginners Questions & Answers Grep command is not working Post 303006682 by Don Cragun on Monday 6th of November 2017 09:19:54 AM
Old 11-06-2017
From the error message you're getting from grep, one might guess that you're using a macOS or BSD operating system, but I don't see why you would get a syntax error on line 5 from bash with this code on those systems.

One might also guess that you copied this code from someone who was using a different operating system that has a grep utility that has a -P option. (The 2nd error message you're getting says that the grep utility you're using does not have a -P option.)

So, where did you get this code and what operating system was being used by the person who wrote this code? And, what operating system and shell are you using?

If you change the grep to get rid of the unknown option and convert the RE being used to be one that would be accepted by any standard version of grep:
Code:
grep -v '^\(.\)\1*$'

you have a grep command that will delete lines where every character in a word is the same character and there are at least two characters in the word.

Making the huge assumption that the shell you're using understands the <(command) syntax in addition to standard shell file redirections, your script with the above modification seems to do what you want.
 

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LEARN ABOUT HPUX

wc

wc(1)							      General Commands Manual							     wc(1)

NAME

       wc - count words, lines, and bytes or characters in a file

SYNOPSIS

       [file]...

DESCRIPTION

       The  command  counts lines, words, and bytes or characters in the named files, or in the standard input if no file names are specified.	It
       also keeps a total count for all named files.

       A word is a string of characters delimited by spaces, tabs, or newlines.

   Options
       recognizes the following options:

	      Report the number of bytes in each input file.

	      Report the number of newline characters in each input file.

	      Report the number of characters in each input file.

	      Report the number of words in each input file.

       The and options are mutually exclusive.	Otherwise, the and or options can be used in any combination to specify that a	subset	of  lines,
       words, and bytes or characters are to be reported.

       When any option is specified, reports only the information requested.  If no option is specified, the default output is

       When a file is specified on the command line, its name is printed along with the counts.

   Standard Output
       By default, the standard output contains an entry for each input file in the form:

	      newlines words bytes file

       If the option is specified, the number of characters replaces the bytes field in this format.

       If any option is specified, the fields for the unspecified options are omitted.

       If no file operand is specified, neither the file name nor the preceding blank character is written.

       If  more than one file operand is specified, an additional line is written at the end of the output, of the same format as the other lines,
       except that the word (in the POSIX locale) is written instead of a file name and the total of each column is written as appropriate.

       Under UNIX Standard environment, a word is a string of characters delimited by spaces, tabs, newline,  carriage-return,	vertical  tab,	or
       form-feed.

RETURN VALUE

       exits with one of the following values:

	      Successful completion.
	      An error occurred.

EXTERNAL INFLUENCES

       For information about the UNIX Standard environment, see standards(5).

   Environment Variables
       determines the range of graphics and space characters, and the interpretation of text as single- and/or multibyte characters.

       determines the language in which messages are displayed.

       If or is not specified in the environment or is null, they default to the value of

       If is not specified or is null, it defaults to (see lang(5)).

       If any internationalization variable contains an invalid setting, they all default to See environ(5).

   International Code Set Support
       Single- and multibyte character code sets are supported.  with a newline character, the count will be off by one.

WARNINGS

       The  command counts the number of newlines to determine the line count.	If a text file has a final line that is not terminated with a new-
       line character, the count will be off by one.

EXAMPLES

       Print the number of words and characters in

       The following is printed when the above command is executed:

       where words is the number of words and chars is the number of characters in

SEE ALSO

       standards(5).

STANDARDS CONFORMANCE

																	     wc(1)
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