sed: deleting 5 lines after a specified pattern

Shell Programming and Scripting
1

As an example (just an example, this could apply to any block of text) say I have this:

architecture x86_64
cputype CPU_TYPE_X86_64
cpusubtype CPU_SUBTYPE_X86_64_ALL
offset 4096
size 2972420
align 2^12 (4096)
architecture ppc64
cputype CPU_TYPE_POWERPC64
cpusubtype CPU_SUBTYPE_POWERPC_ALL
offset 2977792
size 2702672
align 2^12 (4096)

I want to delete the line "architecture x86_64, as well the next 5 lines that come right after it. How would I go about doing that? Thanks

2 
nawk '/architecture x86_64/ {c=6} c && c-- {next}1' myFile
3 
sed '/archictecture/,5d;p' filename

example depends on your sed...

edit correction:

sed -n  '/archictecture x86_64/,5d;p' filename
4

Hi.

Some versions of grep or grep-like utilities can do this. For example, the very versatile cgrep can. Here is a sample of first extracting the string plus the trailing window, then the inversion of that operation, which effectively deletes it, both operations writing to STDOUT:

#!/usr/bin/env bash

# @(#) s2	Demonstrate effectively deleting lines with cgrep.
# http://www.bell-labs.com/project/wwexptools/cgrep/

echo
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1)
set -o nounset
echo

FILE=${1-data1}

echo " Data file $FILE (numbered for this display):"
cat -n $FILE
wc -l $FILE

rm -f t1
echo
echo " Results of matching + copy following:"
cgrep -D +5 "architecture x86_64" $FILE > t1
cat t1
echo " Lines extracted: $(wc -l <t1)"

rm -f t1
echo
echo " Results of matching + copy following with inversion flag:"
cgrep -D -V +5 "architecture x86_64" $FILE > t1
cat t1
echo " Lines extracted: $(wc -l <t1)"

exit 0

producing:

% ./s2

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
GNU bash 3.2.39

 Data file data1 (numbered for this display):
     1	architecture x86_64
     2	cputype CPU_TYPE_X86_64
     3	cpusubtype CPU_SUBTYPE_X86_64_ALL
     4	offset 4096
     5	size 2972420
     6	align 2^12 (4096)
     7	architecture ppc64
     8	cputype CPU_TYPE_POWERPC64
     9	cpusubtype CPU_SUBTYPE_POWERPC_ALL
    10	offset 2977792
    11	size 2702672
    12	align 2^12 (4096)
12 data1

 Results of matching + copy following:
architecture x86_64
cputype CPU_TYPE_X86_64
cpusubtype CPU_SUBTYPE_X86_64_ALL
offset 4096
size 2972420
align 2^12 (4096)
 Lines extracted: 6

 Results of matching + copy following with inversion flag:
architecture ppc64
cputype CPU_TYPE_POWERPC64
cpusubtype CPU_SUBTYPE_POWERPC_ALL
offset 2977792
size 2702672
align 2^12 (4096)
 Lines extracted: 6

So cgrep is not very diffferent from sed when cgrep is used this way. Where it might be superior to sed is in the selection of context window limits: regular expressions and line counts (the latter as shown above) can be used to mark easily the leading and trailing boundaries of a window.

You may need to download and compile cgrep, see the URL in the code above. I have done so on 32-bit and 64-bit GNU/Linux systems.

Best wishes ... cheers, drl