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Full Discussion: Reverse even lines
Top Forums Shell Programming and Scripting Reverse even lines Post 302869611 by ivpz on Wednesday 30th of October 2013 03:42:51 PM
Old 10-30-2013
Reverse even lines

I'm trying to reverse every even line in my file using the awk command below but it prints only the odd lines but nothing else:

Code:
$ awk '(NR % 2) {print}; !(NR % 2) {print | "rev";}' myfile

Any idea what I might have done wrong?

Thank you.

Last edited by Scrutinizer; 10-30-2013 at 05:23 PM.. Reason: Added code tags
 

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curs_scroll(3CURSES)					     Curses Library Functions					      curs_scroll(3CURSES)

NAME
curs_scroll, scroll, scrl, wscrl - scroll a curses window SYNOPSIS
cc [ flag ... ] file ... -lcurses [ library ... ] #include <curses.h> int scroll(WINDOW *win); int scrl(int n); int wscrl(WINDOW *win, int n); DESCRIPTION
With the scroll() routine, the window is scrolled up one line. This involves moving the lines in the window data structure. As an optimiza- tion, if the scrolling region of the window is the entire screen, the physical screen is scrolled at the same time. With the scrl() and wscrl() routines, for positive n scroll the window up n lines (line i+n becomes i); otherwise scroll the window down n lines. This involves moving the lines in the window character image structure. The current cursor position is not changed. For these functions to work, scrolling must be enabled via scrollok(). RETURN VALUES
All routines return the integer ERR upon failure and an integer value other than ERR upon successful completion. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
curs_outopts(3CURSES), curses(3CURSES), attributes(5) NOTES
The header <curses.h> automatically includes the headers <stdio.h> and <unctrl.h>. Note that scrl() and scroll() may be macros. SunOS 5.10 31 Dec 1996 curs_scroll(3CURSES)
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