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Top Forums UNIX for Dummies Questions & Answers Unexpected Behaviour from grepping Text File Post 302650429 by sudon't on Saturday 2nd of June 2012 11:30:58 PM
Old 06-03-2012
Quote:
Originally Posted by hexram
Maybe this can help:
Code:
egrep ^...a.....n. /usr/share/dict/2of12.txt | head -5
advancement
apparition
arraignment
arrangement
audaciousness

I think that a period matches any character, including the record separator, in a regular expression.
The dot will match any sort of whitespace - space, tab, whatever. What other kind of record separator is there, besides newlines? The way you've tried it, it returns words that are eleven or more letters when we want only eleven-letter words.

Code:
^...........$

should return exactly eleven characters. It certainly does in every other wordlist, (or text file), that I have. You need the 'end of line' stop, or it'll look at the first eleven characters, then keep on going. Yet in 2of12, it returns ten-letter words. What can it be matching that I can't see when I have my text editor showing invisibles? Why does this 2of12 file behave differently? There must be something there I can't see.
 

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WORD-LIST-COMPRESS(1)					 Aspell Abbreviated User's Manual				     WORD-LIST-COMPRESS(1)

NAME
word-list-compress - word list compressor/decompressor for GNU Aspell SYNOPSIS
word-list-compress c[ompress] | d[ecompress] DESCRIPTION
word-list-compress compresses or decompresses sorted word lists for use with the GNU Aspell spell checker. COMMANDS
-c, c, compress compress the plain text word list read from standard input. -d, d, decompress decompress the compressed word list read from standard input. EXAMPLES
Here are a few examples of how you can use word-list-compress word-list-compress d <wordlist.cwl >wordlist.txt Decompress file wordlist.cwl to text file wordlist.txt word-list-compress c <wordlist.wl >wordlist.cwl 2>errors.txt Compress wordlist.wl to wordlist.cwl and send any error messages to a text file named errors.txt LC_COLLATE=C sort -u <wordlist.txt | word-list-compress c >wordlist.cwl Sort a word list, then pipe it to word-list-compress to create a compressed binary wordlist.cwl file. word-list-compress d <words.cwl | aspell create master ./words.rws Decompress a wordlist, then pipe it to aspell(1) to create a spelling list. Please check the aspell(1) info manual for proper usage and options. TIPS
Word-list-compress is best used with sorted word list type files. It is not a general purpose compression program since the resulting files may actually increase in size. Word-list-compress accepts up to 255 text characters in the range of {0x21...0xFF}. If your word list requires a larger character set for certain languages or longer length for multi-word, scientific, medical, technical or other use, then it is recommended that you compress your word list using prezip-bin(1) DIAGNOSTICS
Word-list-compress normally exits with a return code of 0. If it encounters an error, a message is sent to standard error output (stderr), and word-list-compress exits with a non-zero return value. Error messages are listed below: (display help/usage message) Unknown command given on the command line so word-list-compress displays a usage message to standard error output. Corrupt Input This is only for the decompression command d. The input file is of an unknown format or the input file/stream is corrupted. You may have some valid output, but word-list-compress could not complete the process. If the input file is a compressed wordlist but you have no output file, then it may be a newer prezip-bin(1) version of compressed file, if so, try decompressing the file with prezip-bin(1) instead. Output Data Error The output is full, write protected, or has an error and can no longer be written to. SEE ALSO
aspell(1), aspell-import(1), prezip-bin(1), run-with-aspell(1) Aspell is fully documented in its Texinfo manual. See the `aspell' entry in info for more complete documentation. REPORTING BUGS
For help, see the Aspell homepage at <http://aspell.net> and send bug reports/comments to the Aspell user list at the above address. AUTHOR
This manual page was written by Aaron Lehmann <aaronl@vitelus.com>, Brian Nelson <pyro@debian.org> and Jose Da Silva <digital@joescat.com>. GNU
2005-09-05 WORD-LIST-COMPRESS(1)
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