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Full Discussion: Delete first 100 lines from a BIG File
Top Forums UNIX for Advanced & Expert Users Delete first 100 lines from a BIG File Post 302659165 by unohu on Wednesday 20th of June 2012 12:08:30 PM
Old 06-20-2012
Hi methyl
Yes, log file is opened by another application. If I change the inode of log file while taking backup then application can not detect new inode. As a result I get blank file. The easiest solution may be execute a script(same as you suggested) when application is down.
Code:
logrotate

command is not available.

@drl I tried 2-3 possibilities which more/less same as given below.
My logfile name is test.log which has 100lines(say) and backup file is back.txt . Here the problem is test.log remains blank even when application is active and should have some log statement.
Code:
cp test.log back.log
sed '1,100d' test.log>temp.log 
mv temp.log test.log

 

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LEARN ABOUT OPENSOLARIS

winsdelln

insdelln(3XCURSES)					  X/Open Curses Library Functions					insdelln(3XCURSES)

NAME

       insdelln, winsdelln - insert/delete lines to/from the window

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int insdelln(int n);

       int winsdelln(WINDOW *win, int n);

PARAMETERS

       n      Is the number of lines to insert or delete (positive n inserts; negative n deletes).

       win    Is a pointer to the window in which to insert or delete a line.

DESCRIPTION

       The  insdelln()	and  winsdelln() functions insert or delete blank  lines  in stdscr or win, respectively.  When n is positive, n lines are
       added before the current line  and the bottom n lines are lost; when n is negative, n lines  are deleted starting with  the  current  line,
       the remaining lines are moved up,  and the bottom n lines are cleared. The position of the cursor does not change.

RETURN VALUES

       On success, these functions return OK. Otherwise, they return ERR.

ERRORS

       None.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       deleteln(3XCURSES), insertln(3XCURSES), libcurses(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							insdelln(3XCURSES)
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