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a guest Jun 26th, 2019 110 Never
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  1. grep '[^[:blank:]]' < file.in > file.out
  2.      
  3. grep '[:blank:]'
  4.      
  5. $ awk NF file
  6.      
  7. sed -e 's/^[[:blank:]]*$//' source_file > newfile
  8.      
  9. sed -e '/^[[:blank:]]*$/d' source_file > newfile
  10.      
  11. sed '/^$/d' in > out
  12.      
  13. ex -s +'v/S/d' -cwq test.txt
  14.      
  15. ex -s +'bufdo!v/S/d' -cxa *.txt
  16.      
  17. cat test.txt | ex -s +'v/S/d' +%p +q! /dev/stdin
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