shawnkendrick/commonly used but often forgotten

## commonly used but often forgotten
# combine, sort and combine all files in a directory into single file
cat dir/*.csv | sort -u > output.csv

# add character to front of every of every line in a file
sed 's/^/#/' file.txt

# combine multiple CSVs, exclude all but first header
awk 'FNR==1 && NR!=1{next;}{print}' *.csv > combined.csv
	# combine, sort and combine all files in a directory into single file
	cat dir/*.csv \| sort -u > output.csv

	# add character to front of every of every line in a file
	sed 's/^/#/' file.txt

	# combine multiple CSVs, exclude all but first header
	awk 'FNR==1 && NR!=1{next;}{print}' *.csv > combined.csv