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Full Discussion: Awk pattern with letters and forward slash
Top Forums UNIX for Dummies Questions & Answers Awk pattern with letters and forward slash Post 302604128 by francy.casa on Saturday 3rd of March 2012 08:07:04 AM
Old 03-03-2012
Awk pattern with letters and forward slash
Hi,

I have a tab delimited file "test.txt" like this:
Code:
id1 342 C/T
id2 7453 T/A/-/G/C
id3 531 T/C
id4 756 A/T/G
id5 23 A/G
id6 717 T/A/C
id7 718 C/T/A

And so on, with the possible choices for letters being A,C,T,G.
I would like to exclude from my file all the lines that do not have exactly any of the letters split by forward slash, followed by any of the letters. So I would like my file to look like this:

Code:
id1 342 C/T
id3 531 T/C
id5 23 A/G

I have not been able to find a good regex for this. I have tried:
Code:
awk '{  if($3 !='/([ACTG]\)/([ACTG]/)' {print}}'  test.txt

But it does not work, can you please tell me what I am doing wrong?
Thank you for your help.
-francy
Last edited by Scott; 03-03-2012 at 09:18 AM.. Reason: Please use code tags
 

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LEARN ABOUT FREEBSD

tabs

TABS(1) 						    BSD General Commands Manual 						   TABS(1)

NAME

     tabs -- set terminal tabs

SYNOPSIS

     tabs [-n | -a | -a2 | -c | -c2 | -c3 | -f | -p | -s | -u] [+m[n]] [-T type]
     tabs [-T type] [+[n]] n1[,n2,...]

DESCRIPTION

     The tabs utility displays a series of characters that clear the hardware terminal tab settings then initialises tab stops at specified posi-
     tions, and optionally adjusts the margin.

     In the first synopsis form, the tab stops set depend on the command line options used, and may be one of the predefined formats or at regular
     intervals.

     In the second synopsis form, tab stops are set at positions n1, n2, etc.  If a position is preceded by a '+', it is relative to the previous
     position set.  No more than 20 positions may be specified.

     If no tab stops are specified, the ``standard'' UNIX tab width of 8 is used.

     The options are as follows:

     -n      Set a tab stop every n columns.  If n is 0, the tab stops are cleared but no new ones are set.

     -a      Assembler format (columns 1, 10, 16, 36, 72).

     -a2     Assembler format (columns 1, 10, 16, 40, 72).

     -c      COBOL normal format (columns 1, 8, 12, 16, 20, 55)

     -c2     COBOL compact format (columns 1, 6, 10, 14, 49)

     -c3     COBOL compact format (columns 1, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62, 67).

     -f      FORTRAN format (columns 1, 7, 11, 15, 19, 23).

     -p      PL/1 format (columns 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61).

     -s      SNOBOL format (columns 1, 10, 55).

     -u      Assembler format (columns 1, 12, 20, 44).

     +m[n], +[n]
	     Set an n character left margin, or 10 if n is omitted.

     -T type
	     Output escape sequence for the terminal type type.

ENVIRONMENT

     The LANG, LC_ALL, LC_CTYPE and TERM environment variables affect the execution of tabs as described in environ(7).

     The -T option overrides the setting of the TERM environment variable.  If neither TERM nor the -T option are present, tabs will fail.

EXIT STATUS

     The tabs utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     expand(1), stty(1), tput(1), unexpand(1), termcap(5)

STANDARDS

     The tabs utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     A tabs utility appeared in PWB UNIX.  This implementation was introduced in FreeBSD 5.0.

BUGS

     The current termcap(5) database does not define the 'ML' (set left soft margin) capability for any terminals.

BSD
								   May 20, 2002 							       BSD
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