问题
What is the difference between && and ; in bash or command?
Eg:
~$ echo one && echo two
And
~$ echo one ; echo two
回答1:
~$ echo one && echo two
This runs the 2. command only if the first command succeeds.
~$ echo one ; echo two
This always runs the 2. command.
~$ echo one || echo two
This runs the 2. command only if the first command fails.
A command is considered successful if its exit code is 0, and considered failed if its exit code is != 0.
来源：https://stackoverflow.com/questions/24367561/what-is-the-difference-between-and-in-bash-or-command