Connectors in the shell (and, and, or)

&& and

|| Or

# when two files are present

[[email protected] ~]# ls 1.txt && ls 2.txt

1.txt

2.txt

# 10.txt file does not exist

[[email protected] ~]# ls 10.txt && ls 2.txt

LS: Unable to access 10.txt: No file or directory

[[email protected] ~]# ls 10.txt | | LS 2.txt

LS: Unable to access 10.txt: No file or directory

2.txt

# 20.txt file does not exist

[[email protected] ~]# ls 1.txt && ls 20.txt

1.txt

LS: Unable to access 20.txt: No file or directory

[[email protected] ~]# ls 1.txt | | LS 20.txt

1.txt

Conclusion:

&& the left and right side of the symbol is two commands, if the previous command can be executed successfully, it will execute the following command;

|| The left and right sides of the symbol are two commands, and if the previous command does not execute successfully, it will execute the subsequent command.

There is another one; the command that precedes it executes successfully, and all subsequent commands execute.

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Connectors in the shell (and, and, or)