Slackware startx command not found
 

I probably do something wrong with $PATH when install Java JDK. Now when I type
startx, reboot, which,... I get command not found.

When I type: echo $PATH
It shows only: /usr/local/java/bin

usually PATH contains: /bin /usr/bin /usr/local/bin (and possibly other dirs too). You can set it in your shell or in /etc/profile

It was really trouble. I cannot edit ~/.profile which I edited before at terminal. I type vi ~/.profile but it showed vi command is not a command. almost command I tried It just showed like that, "A command not found". I'm crazy and decided to reinstall Slackware. This clean trouble.

because vi is not in your path. try /usr/bin/vi (use full path) instead

yes It work naturally. I wish I didn't reinstall slackware if I knew before. Thank so much!

just remember, usually you can solve it without reinstall, this is not windows (which was much harder to repair). But obviously there are cases when you need to do that.