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grep '^[^#]' sample.conf
\__/ |||| \_________/
| |||| |
| |||| \- Filename
| |||\- Only character in group is '#'
| ||\- Negate character group (will match any cahracter *not* in the
| || group)
| |\- Start new character group (will match any character in the
| | group)
| \- Match beginning of line
\- Run grep
Empty lines will also be not matched, because there has to be at least one non-hash-sign character in the line.