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awk for line number 2

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# 8  
Old 05-23-2012
He wants you to look for the WORD connected rather than the substring connected which is part of dis"connected". You can declare word boundaries in a regexp.
# 9  
Old 05-23-2012
Well said. :-)
# 10  
Old 05-23-2012
Word boundaries are not specified in POSIX and are not universally available in grep. Most greps do have a -w switch:
Code:
$ echo bla bla connected | grep '\<connected\>'   
$ echo bla bla connected | grep -w 'connected' 
bla bla connected
$

Although -w is not specified in POSIX either.
Last edited by Scrutinizer; 05-23-2012 at 02:26 AM..
This User Gave Thanks to Scrutinizer For This Post:
gary_w
# 11  
Old 06-01-2012
Quote:
Originally Posted by Scrutinizer
Word boundaries are not specified in POSIX and are not universally available in grep. Most greps do have a -w switch:
Code:
$ echo bla bla connected | grep '\<connected\>'   
$ echo bla bla connected | grep -w 'connected' 
bla bla connected
$

Although -w is not specified in POSIX either.
How do I check if mine has word boundaries? I searched my man page for the word boundaries with no luck. When I ran the command it seemed to do what gary said. Here is my version info.

Code:
grep -V
grep (GNU grep) 2.9
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Mike Haertel and others, see <http://git.sv.gnu.org/cgit/grep.git/tree/AUTHORS>.

Here is my finished product if anyone is curious Smilie. I use different types of screens for a dual monitor on a regular basis and this makes life a lot easier. Next step is to get this to work in an alias Smilie.

Code:
VAR=$(xrandr | awk '$2=="connected"{s=$1} END{print s}'); xrandr --output $VAR --mode 1024x768 --rate 60; xrandr --output LVDS1 --left-of $VAR; xrandr --output LVDS1 --primary; unset VAR;

# 12  
Old 06-01-2012
From man (GNU) grep (2.5.4):
Code:
   The Backslash Character and Special Expressions
       The  symbols  \< and \> respectively match the empty string at the beginning and end of a word.  The symbol \b matches the
       empty string at the edge of a word, and \B matches the empty string provided it's not at the edge of a word.   The  symbol
       \w is a synonym for [[:alnum:]] and \W is a synonym for [^[:alnum:]].

So yes, GNU grep has word boundaries, so you can use them, unless you want your code to be universal and/or want it to run on other platforms that do not have GNU grep.
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