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Question

In linux, when running two or more commands together, what is the difference between && vs ||, i.e. the following two line:

command1 && command2
command1 || command2

Answer
When using &&, it means run command2 only if command1 returns with success exit code (i.e. 0)
When using ||, it means run command2 only if command1 returns error exit code (i.e. non 0)

Question

In linux, when running two or more commands together, what is the difference between && vs ||, i.e. the following two line:

command1 && command2
command1 || command2

Answer
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Question

In linux, when running two or more commands together, what is the difference between && vs ||, i.e. the following two line:

command1 && command2
command1 || command2

Answer
When using &&, it means run command2 only if command1 returns with success exit code (i.e. 0)
When using ||, it means run command2 only if command1 returns error exit code (i.e. non 0)
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20. Advanced Shell Scripting
sh shell scripting begun in Chapter 7 and expanded on in Chapter 9. These three chapters represent almost everything you can do with the bash shell. 20.1 Lists of Commands The special operator <span>&& and || can be used to execute functions in sequence. For instance: grep '^harry:' /etc/passwd || useradd harry The || means to only execute the second command if the first command returns an e

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