complete -c seq -x
complete -c seq -s f -l format -x          -d 'use printf style floating-point FORMAT'
complete -c seq -s s -l separator -x       -d 'use STRING to separate numbers (default: \n)'
complete -c seq -s w -l equal-width        -d 'equalize width by padding with leading zeroes'
complete -c seq -l help     -d 'display this help and exit'
complete -c seq -l version  -d 'output version information and exit'