I have a lot of chromedriver processes, It is very inefficient to kill with the kill command in order using the process number.
$ ps aux|grep chromedriver
yusaku            8013   0.0  0.1  4360484  12024 s001  S     1:01PM   0:00.22 /Users/yusaku/chromedriver --port=53472
yusaku            2932   0.0  0.1  4360484  11992 s001  S    12:25AM   0:00.25 /Users/yusaku/chromedriver --port=64392
yusaku            2880   0.0  0.1  4360484  11988 s001  S    12:25AM   0:00.26 /Users/yusaku/chromedriver --port=64302
yusaku            2512   0.0  0.1  4360484  12256 s001  S    12:07AM   0:00.28 /Users/yusaku/chromedriver --port=63331
yusaku           99432   0.0  0.1  4360620  12268 s001  S     8:08PM   0:00.36 /Users/yusaku/chromedriver --port=56561
yusaku           99261   0.0  0.1  4360620  12252 s001  S     7:59PM   0:00.48 /Users/yusaku/chromedriver --port=56221
yusaku           98284   0.0  0.1 4360620 12236 s001 S Sat 05PM 0:00.60 /Users/yusaku/chromedriver --port=55684
yusaku           98202   0.0  0.1 4360620 12240 s001 S Sat 05PM 0:00.43 /Users/yusaku/chromedriver --port=55487
yusaku           98120   0.0  0.1 4360620 12256 s001 S Sat 05PM 0:00.44 /Users/yusaku/chromedriver --port=55307
yusaku           98031   0.0  0.1 4360620 12320 s001 S Sat 05PM 0:00.33 /Users/yusaku/chromedriver --port=55113
yusaku           97976   0.0  0.1 4360484 12268 s001 S Sat 05PM 0:00.35 /Users/yusaku/chromedriver --port=55082
yusaku           97891   0.0  0.1 4360620 12540 s001 S Sat 05PM 0:00.51 /Users/yusaku/chromedriver --port=54923
yusaku           97807   0.0  0.1 4360620 12464 s001 S Sat 05PM 0:00.44 /Users/yusaku/chromedriver --port=54755
yusaku           97014   0.0  0.1 4360484 12004 s001 S Sat 04PM 0:00.34 /Users/yusaku/chromedriver --port=53365
yusaku           96928   0.0  0.1 4360484 11992 s001 S Sat 04PM 0:00.31 /Users/yusaku/chromedriver --port=53308
yusaku           96873   0.0  0.1 4360484 12000 s001 S Sat 04PM 0:00.31 /Users/yusaku/chromedriver --port=53169
yusaku           96811   0.0  0.1 4360484 12016 s001 S Sat 04PM 0:00.34 /Users/yusaku/chromedriver --port=53027
yusaku           95623   0.0  0.1  4360484  11984   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=52319
yusaku           95584   0.0  0.1  4360484  12012   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=52297
yusaku           95533   0.0  0.1  4360484  12012   ??S Sat 03 PM 0:00.34 /Users/yusaku/chromedriver --port=52151
yusaku           95495   0.0  0.1  4360484  12000   ??S Sat 03 PM 0:00.33 /Users/yusaku/chromedriver --port=52133
yusaku           95445   0.0  0.1  4360484  11988   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=51998
yusaku           95405   0.0  0.1  4360484  12000   ??S Sat 03 PM 0:00.31 /Users/yusaku/chromedriver --port=51979
yusaku           95340   0.0  0.1  4360484  11976   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=51817
yusaku           95280   0.0  0.1  4360484  11984   ??S Sat 03 PM 0:00.35 /Users/yusaku/chromedriver --port=51679
yusaku           95214   0.0  0.1  4360484  12004   ??S Sat 03 PM 0:00.31 /Users/yusaku/chromedriver --port=51621
yusaku           95160   0.0  0.1  4360484  11996   ??S Sat 03 PM 0:00.31 /Users/yusaku/chromedriver --port=51589
yusaku           95068   0.0  0.1  4360484  11984   ??S Sat 03 PM 0:00.31 /Users/yusaku/chromedriver --port=51404
yusaku           95026   0.0  0.1  4360484  12008   ??S Sat 03 PM 0:00.31 /Users/yusaku/chromedriver --port=51385
yusaku           94964   0.0  0.1  4360484  11972   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=51310
yusaku           94891   0.0  0.1  4360484  12008   ??S Sat 03 PM 0:00.31 /Users/yusaku/chromedriver --port=51265
yusaku           94795   0.0  0.1  4368688  12228   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=50551
yusaku           94743   0.0  0.1  4360484  12280   ??S Sat 03 PM 0:00.33 /Users/yusaku/chromedriver --port=50411
yusaku           94627   0.0  0.1  4360484  12272   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=50249
yusaku           94565   0.0  0.1  4360484  12284   ??S Sat 03 PM 0:00.33 /Users/yusaku/chromedriver --port=50088
yusaku           94508   0.0  0.1  4360484  12260   ??S Sat 03 PM 0:00.34 /Users/yusaku/chromedriver --port=49947
yusaku           94016   0.0  0.1  4360484  12244   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=49324
yusaku           93963   0.0  0.1  4360484  12248   ??S Sat 03 PM 0:00.33 /Users/yusaku/chromedriver --port=49179
yusaku           93910   0.0  0.1  4360484  12204   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=65531
yusaku           93859   0.0  0.1  4360484  12232   ??S Sat 03 PM 0:00.37 /Users/yusaku/chromedriver --port=65390
yusaku           93808   0.0  0.1  4360484  12220   ??S Sat 03 PM 0:00.37 /Users/yusaku/chromedriver --port=65259
yusaku           93758   0.0  0.1  4360484  12212   ??S Sat 03 PM 0:00.32 /Users/yusaku/chromedriver --port=65231
yusaku           93607   0.0  0.1  4360484  12236   ??S Sat 03 PM 0:00.36 /Users/yusaku/chromedriver --port=64962
yusaku           11837   0.0  0.0  4277992   1008 s001  S+    7:36PM   0:00.00 grep chromedriver
yusaku           11749   0.0  0.2  4360484  13808 s001  S     7:30PM   0:00.06 /Users/yusaku/chromedriver --port=58743
yusaku           11636   0.0  0.2  4360484  13836 s001  S     7:28PM   0:00.07 /Users/yusaku/chromedriver --port=58678
You can kill them all at once using pgrep and xargs.
$ pgrep chromedriver| xargs kill -9
$
$ ps aux|grep chromedriver
yusaku           11934   0.0  0.0  4267752   1008 s001  S+    7:48PM   0:00.01 grep chromedriver
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