Split Files
By Size
split --bytes 500M --numeric-suffixes --suffix-length=3 foo foo
By lines
split -l 407000 BASE_DL70_M7.csv NAUCALPAN_
split --additional-suffix=.txt -d -l 9000 VALLE_MEXICO_NORTE_03052016R4_20160901_Remesa\ 2\ P6b.txt VALLE_MEXICO_P
Headers
head -n 1 NAUCALPAN_aa > headers
Archivo con headers
cat headers NAUCALPAN_ab > NAUCALPAN_2.csv