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On the Mac OS X:
jot 999999On Linux (specifically Xubuntu):
seq 999999yes ' '|nlyes, unixmonkey is correct. seq is shorter and faster.
seq 999999The statements in the comments and the OP are different. The OP statement will count until stopped (or until it reaches the limitation of the hardware/software) and doesn't specify or use a ceiling number. Seq does.
timing the following commands piped to head -n 10000000 directed to dev null gives the following speeds and CPU
7.08s 09.1% yes '' | awk '{print NR}'
3.64s 99.4% jot
2.26s 29.6% yes '' | cat -n
"yes ' ' | nl" only counts one past 999999