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Top Forums Shell Programming and Scripting ITERATION: remove row based on string value Post 302450214 by asanjuan on Thursday 2nd of September 2010 03:09:45 AM
Old 09-02-2010
ITERATION: remove row based on string value

Make myself clear:

Code:
> cat file
OM   3328   O     BT   268       5.800      7.500      4.700      0.000      1.400
OM   3329   O     BT   723       8.500      8.900      3.600      8.500      1.400
OM   3330   O     AT   231       6.700      5.500      7.600      0.000      1.400
OM   3331   O     AT   234       1.200      7.700      5.500      8.500      1.400
OM   3332   O     AT   256       3.800      5.800      5.200      0.100      1.400

Code:
> cat newfile
OM   3328   O     BT   268       5.800      7.500      4.700      0.000      1.400
OM   3329   O     BT   723       8.500      8.900      3.600      8.500      1.400
OM   3330   O     AT   231       6.700      5.500      7.600      0.000      1.400
OM   3332   O     AT   256       3.800      5.800      5.200      0.100      1.400

Using awk the output newfile should ONLY delete lines with AT string (4th column) with value greater than 0.10 at (9th column).


Moderator's Comments:
Mod Comment Please use code tags, thank you


---------- Post updated at 03:09 PM ---------- Previous update was at 02:48 PM ----------

Thank you moderator for the kind reply.

awk '$4=="AT" && $9 <= 0.1 && $9 >= 0.0' file

Code above you gave prints line with string AT (4th column) and with value 0.0-0.10 (9th column).

Since one file contains 4000 lines with about 30 different strings at 4th column, it would be better that instead of above task, I would create a code (with help from forum) to just delete rows with AT string and >0.10 value (9th column). This way, rest of the lines with non "AT" string will kept inside the file.
 

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remove(3C)						   Standard C Library Functions 						remove(3C)

NAME
remove - remove file SYNOPSIS
#include <stdio.h> int remove(const char *path); DESCRIPTION
The remove() function causes the file or empty directory whose name is the string pointed to by path to be no longer accessible by that name. A subsequent attempt to open that file using that name will fail, unless the file is created anew. For files, remove() is identical to unlink(). For directories, remove() is identical to rmdir(). See rmdir(2) and unlink(2) for a detailed list of failure conditions. RETURN VALUES
Upon successful completion, remove() returns 0. Otherwise, it returns -1 and sets errno to indicate an error. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
rmdir(2), unlink(2), attributes(5), standards(5) SunOS 5.10 14 Aug 2002 remove(3C)
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