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Full Discussion: Need awk to extract lines and sort
Top Forums Shell Programming and Scripting Need awk to extract lines and sort Post 302360864 by durden_tyler on Sunday 11th of October 2009 01:23:24 AM
Old 10-11-2009
Quote:
Originally Posted by genehunter
...
What I tried:
Code:
gawk '{if(NR>1 && $5="ADD") {print $0}}' infile>outfile

Everything in col5 is changed to ALL. Smilie
That's because you assigned the value "ADD" to the fifth field ($5). You will have to compare the fifth field ($5) with "ADD" instead.

=> Operator for assignment is "=". It changes the value.
=> Operator for comparison is "==". It doesn't change the value.

Code:
$
$ cat f1
 CHR                           SNP         BP   A1       TEST    NMISS         OR         STAT            P
   0                 SNP_A-8282315          0    2        ADD     1530      1.074       0.7707       0.4409
   0                 SNP_A-8282315          0    2       COV1     1530  1.771e+04        4.764    1.898e-06
   0                 SNP_A-8282315          0    2       COV2     1530  1.513e+04        4.645    3.402e-06
   0                 SNP_A-8282315          0    2       COV3     1530      14.16        1.306       0.1915
   0                 SNP_A-8282315          0    2       COV4     1530      1.264       0.1139       0.9093
   0                 SNP_A-8282315          0    2       COV5     1530      2.389       0.4268       0.6695
   0                 SNP_A-8338258          0    4        ADD     1528     0.9498      -0.6824        0.495
   0                 SNP_A-8338258          0    4       COV1     1528  1.846e+04        4.777    1.783e-06
   0                 SNP_A-8338258          0    4       COV2     1528  1.374e+04          4.6    4.224e-06
   0                 SNP_A-8338258          0    4       COV3     1528      14.82         1.33       0.1836
   0                 SNP_A-8338258          0    4       COV4     1528      1.251       0.1087       0.9134
   0                 SNP_A-8338258          0    4       COV5     1528      2.431       0.4354       0.6633
$
$ gawk '{if(NR>1 && $5=="ADD") {print $0}}' f1
   0                 SNP_A-8282315          0    2        ADD     1530      1.074       0.7707       0.4409
   0                 SNP_A-8338258          0    4        ADD     1528     0.9498      -0.6824        0.495
$
$

Rookie programmer mistake. Smilie

In fact, since printing the line is the default action of awk and its variants, you could slim down your one-liner to:

Code:
gawk '$5=="ADD"' <filename>

tyler_durden
 

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LEARN ABOUT OPENSOLARIS

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgawk	      |
       +--------------------+-----------------+
       |Interface Stability | Volatile	      |
       +--------------------+-----------------+
NOTES

       Source for gawk is available on http://opensolaris.org.

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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