Convert two column data into 8 columns Post: 91753

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Top Forums Shell Programming and Scripting Convert two column data into 8 columns Post 91753 by Unbeliever on Monday 5th of December 2005 11:07:03 AM

12-05-2005

Registered User

Here is the code spread out a bit more for readability, with line numbers proceeding so I can reference.

Code:

1: printf("%8s%8s",$1,$2);
2: a+=1;
3: if ( a%4 == 0)
4:   print "";

In this case the whole piece of code is run for each line of input.

Line1:
This prints out columns 1 and 2 ($1 and $2) of the input line ... the '%8s' means they get printed out in 8 character columns left padded with spaces.

Line 2:
Once the line has been read and the first 2 columns have been printed we increment a counter by one.

Line 3:
This test to see if our counter variable (the one we just incremented) is a multiple of 4 or not. the '%' operator returns the remainder after dividing the 1st argument (a) by the second (4).

Line 4:
So if the remainder of "a/4" is zero (ie. it is divisible by 4) then we print a new line. The reason this works is that the 'print' command always prints a new line character as opposed to the printf command which doesn't. This has the effect of printing a new line every 4 lines of input.

Hope that helps ...

Unbeliever

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LEARN ABOUT OSX

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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