24 lines
351 B
Sed
24 lines
351 B
Sed
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#!/bin/sed -f
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# Put 80 spaces in the buffer
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1 {
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x
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s/^$/ /
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s/^.*$/&&&&&&&&/
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x
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}
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# del leading and trailing spaces
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y/\t/ /
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s/^ *//
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s/ *$//
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# add a newline and 80 spaces to end of line
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G
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# keep first 81 chars (80 + a newline)
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s/^\(.\{81\}\).*$/\1/
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# \2 matches half of the spaces, which are moved to the beginning
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s/^\(.*\)\n\(.*\)\2/\2\1/
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