a guest Jun 26th, 2019 110 Never
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- grep '[^[:blank:]]' < file.in > file.out
- grep '[:blank:]'
- $ awk NF file
- sed -e 's/^[[:blank:]]*$//' source_file > newfile
- sed -e '/^[[:blank:]]*$/d' source_file > newfile
- sed '/^$/d' in > out
- ex -s +'v/S/d' -cwq test.txt
- ex -s +'bufdo!v/S/d' -cxa *.txt
- cat test.txt | ex -s +'v/S/d' +%p +q! /dev/stdin
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