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Full Discussion: Delete all CONSECUTIVE text lines from file shell scripting
Top Forums Shell Programming and Scripting Delete all CONSECUTIVE text lines from file shell scripting Post 302977589 by RudiC on Wednesday 20th of July 2016 06:33:52 AM
Old 07-20-2016
I was more talking of your own efforts... anyhow, try
Code:
awk '/^ *$/ {CNT = 0; print; next} ++CNT < 3 {T[CNT] = $0; next} CNT == 3 {print T[1]; print T[2]} 1' file

This User Gave Thanks to RudiC For This Post:
RJSKR28
 

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LEARN ABOUT CENTOS

btrfs-debug-tree

BTRFS-DEBUG-TREE(8)					      System Manager's Manual					       BTRFS-DEBUG-TREE(8)

NAME

       btrfs-debug-tree - dump Btrfs filesystem metadata into stdout.

SYNOPSIS

       btrfs-debug-tree [options] <device>

DESCRIPTION

       btrfs-debug-tree  is used to dump the whole tree of the given device.  This is maybe useful for analyzing filesystem state or inconsistence
       and has a positive educational effect on understanding the internal structure.  device is the device file where the filesystem is stored.

       Options

       -e   print detailed extents info.

       -d   print info of btrfs device and root tree dirs only.

       -r   print info of roots only.

       -b <block_num>
	    print info of the specified block only.

EXIT CODE

       btrfs-debug-tree will return 0 if no error happened.  If any problems happened, 1 will be returned.

AUTHOR

       Written by Shilong Wang and Wenruo Qu.

COPYRIGHT

       Copyright (C) 2013 Fujitsu, Inc.  License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free  to	change	and  redistribute  it. There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       mkfs.btrfs(8)

															       BTRFS-DEBUG-TREE(8)
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