Here is a looper to remove more than one consecutive blank lines, which illustrates the concept:
I put my sed script on its own lines for clarity. If you want to check for lines with only spaces and tabs, that scrubbing can be done upstream in one line or inserted here as two lines. That is why I say sed loopers are usually best kept separate from non-loopers. There is no single place to filter and translate single lines in a looper without redundant processing, like substituting on each line twice.
Narrative:
Create a branch target,
if last line branch to end of script (print buffer and exit) as $N usually tosses the last line,
get the next line on end of buffer as '\nLine_2',
if both lines are empty, remove one,
if line was removed branch back to loop,
print the first line,
remove the first line and
branch back to loop.
Last edited by DGPickett; 07-10-2013 at 06:00 PM..
hello!
I have a few sed commands
sed '/^$/d' < $1 > tmp.t
sed '/^ \{3,\}/d' < tmp.t > tmp1.txt
.....
how can I write them in a single line?
sed '/^$/d' < $1 > | '/^ \{3,\}/d' < $1 > tmp1.txt
any idea?
thanks. (5 Replies)
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clear
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