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Top Forums Shell Programming and Scripting Delete line with sed or awk (with specified condition) Post 302488531 by </kida> on Monday 17th of January 2011 02:52:47 PM
Old 01-17-2011
Delete line with sed or awk (with specified condition)

Hello. I'm trying to delete the lines of a file does not contain the letter "T " (for example) at position 26.

So far, I could only print the result:
Code:
awk '{if (substr ($ 1,1,26)! ~ / T /) print}' file.txt

How I can do to eliminate the lines that meet this condition?


Help please. Thanks.

Last edited by Franklin52; 01-18-2011 at 03:17 AM.. Reason: Please use code tags
 

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scroll(3NCURSES)														  scroll(3NCURSES)

NAME
scroll, scrl, wscrl - scroll a curses window SYNOPSIS
#include <curses.h> int scroll(WINDOW *win); int scrl(int n); int wscrl(WINDOW *win, int n); DESCRIPTION
The scroll routine scrolls the window up one line. This involves moving the lines in the window data structure. As an optimization, if the scrolling region of the window is the entire screen, the physical screen may be scrolled at the same time. For positive n, the scrl and wscrl routines 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 VALUE
These routines return ERR upon failure, and OK (SVr4 only specifies "an integer value other than ERR") upon successful completion. X/Open defines no error conditions. This implementation returns an error if the window pointer is null, or if scrolling is not enabled in the window, e.g., with scrollok. NOTES
Note that scrl and scroll may be macros. The SVr4 documentation says that the optimization of physically scrolling immediately if the scroll region is the entire screen "is" per- formed, not "may be" performed. This implementation deliberately does not guarantee that this will occur, to leave open the possibility of smarter optimization of multiple scroll actions on the next update. Neither the SVr4 nor the XSI documentation specify whether the current attribute or current color-pair of blanks generated by the scroll function is zeroed. Under this implementation it is. PORTABILITY
The XSI Curses standard, Issue 4 describes these functions. SEE ALSO
ncurses(3NCURSES), outopts(3NCURSES) scroll(3NCURSES)
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