expr:tldr:2704a

expr: Get the first expression if its value is non-zero and not null otherwise get the second one.

expr

$ expr ${expression1} \| ${expression2}

try on your machine

This command uses the expr command in Unix/Linux to perform mathematical or logical operations on two expressions. The "|" character is a bitwise OR operator used within expr command.

Here's the breakdown of the command:

expr: It is a command-line utility that evaluates and prints the value of an expression. It can perform operations like arithmetic, logical, string comparisons, etc.
${expression1}: It is a variable representing the first expression to be evaluated. The actual expression should be replaced by the value.
|: It is the escaped "|" character within the expr command, which is the bitwise OR operator. It performs a bitwise OR operation on the binary representations of the two expressions.
${expression2}: It is a variable representing the second expression to be evaluated. Again, the actual expression should be substituted with the desired value.

In summary, the overall command evaluates the bitwise OR operation between expression1 and expression2 using the Unix/Linux expr command.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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