cat.1posix %2Fhome%2Fmarcos%2FDCIM%2F347CANON%2F_MG_4757.JPG %7C exiftool -iptc%3Akeywords%2B%3DNosVemosEnDT - %3E 4757.JPG %2Fhome%2Fmarcos%2FDCIM%2F347CANON%2F_MG_4757.JPG 
concatenate and print files
source manpages: cat