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Full Discussion: only if column1 equals this print that
Top Forums Shell Programming and Scripting only if column1 equals this print that Post 302187608 by era on Monday 21st of April 2008 02:22:35 PM
Old 04-21-2008
Remember the previous line, and print that if the current line doesn't match. If the current line does match the previous line, print a combined line. As a special case, print the last one you remembered at end of file.

Actually the remembering for the next round has to happen right at the end of the main loop, and the beginning of the loop is conditional on there being a remembered value.

Code:
awk '{ if (r[0]) {
    if ($1 != r[0]) print r[0], r[1], r[2]; 
    else print $1, r[1], r[2], $2, $3;
  }
  r[0] = $1; r[1] = $2; r[2] = $3; }
END { print r[0], r[1], r[2]; }' file

Last edited by era; 04-21-2008 at 03:24 PM.. Reason: Improve flow
 

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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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