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Regular expression question...

What is the best way to take each line beginning with <some_string> and move
it down 5 lines lower in the file?
Also, If you want to replace two consecutive blank lines with a single blank
line, how do you do it? This isn't working:
cat test_file.txt|sed -r 's/[\n\n]/[\n]/'
Thanks!!


Jul 19 '05 #1
1 2668
"Andrew Munn" <an*********@hotmail.com> wrote in message news:<bd**********@bob.news.rcn.net>...
What is the best way to take each line beginning with <some_string> and move
it down 5 lines lower in the file?
ex -s inputfile <<[EOF]
g/^regex/m+5
x
[EOF]

sed -e '/\n/G;/^regex/{h;N;N;N;N;N;D;}' inputfile

note: the outputs of ex and sed would diverge if the next /regex/ is found
within the first 5 lines. don't know how to make them same. some sed guru
is required for this.


Also, If you want to replace two consecutive blank lines with a single blank
line, how do you do it? This isn't working:
cat test_file.txt|sed -r 's/[\n\n]/[\n]/'


sed -e '/./!{$!N;/^\n$/s///;}' inputfile
Jul 19 '05 #2

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