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Full Discussion: SED text edit help needed
Top Forums Shell Programming and Scripting SED text edit help needed Post 302126275 by stevefox on Wednesday 11th of July 2007 12:58:30 AM
Old 07-11-2007
Question SED text edit help needed

Could someone please tell me how to delete all lines above a line which contains a particular string? (possibly using SED command)
I know how to do this if the target string appears in only one line of file but when it appears in multiple lines it only deletes from the first line which the string appears to the top line. I want it to delete from the last line which the string appears to the top line.


e.g I have the file below which contains 8 lines:

Code:
$ cat file.txt
a
b
c
d
a
b
c
d
$

I want to delete everything above the line with the charater "b" to get the below:

Code:
c
d

I tried with the command below but it only deleted line from the top to the first line which contains the charater "b"

sed '1,/b/d' file.txt

Regards,
Steve
 

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curs_deleteln(3X)														 curs_deleteln(3X)

NAME
deleteln, wdeleteln, insdelln, winsdelln, insertln, winsertln - delete and insert lines in a curses window SYNOPSIS
#include <curses.h> int deleteln(void); int wdeleteln(WINDOW *win); int insdelln(int n); int winsdelln(WINDOW *win, int n); int insertln(void); int winsertln(WINDOW *win); DESCRIPTION
The deleteln and wdeleteln routines delete the line under the cursor in the window; all lines below the current line are moved up one line. The bottom line of the window is cleared. The cursor position does not change. The insdelln and winsdelln routines, for positive n, insert n lines into the specified window above the current line. The n bottom lines are lost. For negative n, delete n lines (starting with the one under the cursor), and move the remaining lines up. The bottom n lines are cleared. The current cursor position remains the same. The insertln and winsertln routines, insert a blank line above the current line and the bottom line is lost. RETURN VALUE
All routines return the integer ERR upon failure and an OK (SVr4 specifies only "an integer value other than ERR") upon successful comple- tion. PORTABILITY
These functions are described in the XSI Curses standard, Issue 4. The standard specifies that they return ERR on failure, but specifies no error conditions. NOTES
Note that all but winsdelln may be macros. These routines do not require a hardware line delete or insert feature in the terminal. In fact, they won't use hardware line delete/insert unless idlok(..., TRUE) has been set on the current window. SEE ALSO
curses(3X) curs_deleteln(3X)
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