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Full Discussion: counting lines containing two column field values with awk
Top Forums Shell Programming and Scripting counting lines containing two column field values with awk Post 302532818 by origamisven on Wednesday 22nd of June 2011 06:53:14 AM
Old 06-22-2011
Java
Of course... The text file looks something like this:

1 ABC
1 ABC
1 ABC
2 SOL
2 SOL
2 SOL
5 ABC
5 ABC
5 ABC
5 ABC
2 SOL
2 SOL
2 SOL
3 SOL
3 SOL
3 SOL

What I need the script to do is find the first occurrence of SOL in column 2 and count the number of times I consecutively find SOL in column 2 until the number in column 1 changes.

In fact I want to count constant atom numbers for a particular molecule (SOL). So in this particular case the output should be the integer value "3".

The problem is that in this ecample "2 " and "SOL" occurs 6 times within the same line (since there are two blocks of three three lines each). I need to find only the first block of lines and count the atoms.
 

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LEARN ABOUT LINUX

colrm

COLRM(1)						    BSD General Commands Manual 						  COLRM(1)

NAME

     colrm -- remove columns from a file

SYNOPSIS

     colrm [start [stop]]

DESCRIPTION

     The colrm utility removes selected columns from the lines of a file.  A column is defined as a single character in a line.  Input is read
     from the standard input.  Output is written to the standard output.

     If only the start column is specified, columns numbered less than the start column will be written.  If both start and stop columns are spec-
     ified, columns numbered less than the start column or greater than the stop column will be written.  Column numbering starts with one, not
     zero.

     Tab characters increment the column count to the next multiple of eight.  Backspace characters decrement the column count by one.

ENVIRONMENT

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

EXIT STATUS

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

SEE ALSO

     awk(1), column(1), cut(1), paste(1)

HISTORY

     The colrm command appeared in 3.0BSD.

BSD
								  August 4, 2004							       BSD
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