`killall` was different on Solaris than Linux; too.
Learning those differences by coming to Linux from Solaris was liberating; there were less limits generally. The other way around was less fun: as in this example, code that had run fine before was now subject to weird behaviors that were caused by underlying system assumptions being different. At least Solaris usually had decent documentation.
I took down the production environment once with killall. The conversation explaining to management about why I ran something called "killall" and didn't expect it to kill all was very tense.
For the uninitiated (like me), killall in Solaris kills "all active processes not directly related to the shutdown procedure" (not those with a certain name as the Linux/psmisc killall does).
Learning those differences by coming to Linux from Solaris was liberating; there were less limits generally. The other way around was less fun: as in this example, code that had run fine before was now subject to weird behaviors that were caused by underlying system assumptions being different. At least Solaris usually had decent documentation.