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Full Discussion: Unexpected Behaviour from grepping Text File
Top Forums UNIX for Dummies Questions & Answers Unexpected Behaviour from grepping Text File Post 302650419 by hexram on Saturday 2nd of June 2012 10:44:01 PM
Old 06-02-2012
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.

---------- Post updated at 10:44 PM ---------- Previous update was at 10:28 PM ----------

Maybe THIS can help better:
Code:
egrep -w ...a.....n. /usr/share/dict/2of12.txt | head -5
advancement
apparition
arraignment
arrangement
bipartisan

The -w option stands for --word-regexp in egrep's man. Still, a period may match a record separator and thus you get ten character words OR eleven character words...

Now THIS may be quite what you wanted in the first place:
Code:
egrep -w '...a.....n[^^M]' /usr/share/dict/2of12.txt | head -5
advancement
arraignment
arrangement
derangement
devastating

The regular expression ends with a character range that means 'any character EXCEPT a record separator'; you may get it as a caret followed by a newline, both enclosed in brackets (open bracket, caret, control-V, newline, close bracket). Just a single tiny side-effect: I get 'self-advancement' somewhere down the list of results...
Last edited by hexram; 06-02-2012 at 11:58 PM.. Reason: Further clarification of my answer
This User Gave Thanks to hexram For This Post:
sudon't
 

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LEARN ABOUT DEBIAN

canadian-english

canadian-english(5)						   Users' Manual					       canadian-english(5)

NAME

       canadian-english - a list of English words

DESCRIPTION

       /usr/share/dict/canadian-english is an ASCII file which contains an alphabetic list of words, one per line.

FILES

       There  may  be  any  number  of	word lists in /usr/share/dict/.  /etc/dictionaries-common/words is a symbolic link to the currently-chosen
       /usr/share/dict/<language> file.  /usr/share/dict/words is a symbolic link to /etc/dictionaries-common/words, and  is  the  name  by  which
       other  software should refer to the system word list.  See select-default-wordlist(8) for more information, and/or to change the currently-
       chosen word list.

       The directory /usr/share/dict can contain word lists for many languages, with name of the language in English, e.g., /usr/share/dict/french
       and  /usr/share/dict/danish  contain respectively lists of French and Danish words if they exist.  Such lists should be coded using the ISO
       8859-1 character set encoding.

SEE ALSO

       ispell(1), select-default-wordlist(8), and the Filesystem Hierarchy Standard.

HISTORY

       The words lists are not specific, and may be generated from any number of sources.

       The system word list used to be /usr/dict/words.  For compatibility, software should check that location if /usr/share/dict/words does  not
       exist.

AUTHOR

       Word  lists  are  collected and maintained by various authors.  The Debian English word lists are built from the SCOWL (Spell- Checker Ori-
       ented Word Lists) package, whose upstream editor is Kevin Atkinson <kevina@users.sourceforge.net>.

Debian								   16 June 2003 					       canadian-english(5)
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