Bash Assignment

Bash Assignment-15
(Bash does not support floating-point arithmetic.) No overflow checking is performed, so operations on very large integers may produce an unexpected result, without causing an error.Division by zero is detected, however, and causes an error.The exception is whenever let evaluates an expression that explicitly sets a variable's value.

(Bash does not support floating-point arithmetic.) No overflow checking is performed, so operations on very large integers may produce an unexpected result, without causing an error.Division by zero is detected, however, and causes an error.The exception is whenever let evaluates an expression that explicitly sets a variable's value.

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Read in 7 minutes Most programmers can get by without declare in bash. The leverage you get out of using declare and variable attributes is huge.

It goes way beyond creating arrays and integer variables.

Although not as powerful as similar constructs in the P languages (Perl, Python, and PHP) and others, they are often quite useful.

Bash arrays have numbered indexes only, but they are sparse, ie you don't have to define all the indexes.

It is not necessary to declare a variable for the purpose of initialization if no assignment was made prior to appearance in script.

Bash Assignment

If you're used to a "standard" *NIX shell you may not be familiar with bash's array feature.

One thing you learn later in bash is to use certain builtin commands. Here we cover how to use the builtin declare to modify the attributes of bash variables allowing you to create of arrays, list functions, integers, and much more.

bash -c "help declare" declare: declare [-a Af Fgilnrtux] [-p] [name[=value] ...] Set variable values and attributes. If no NAMEs are given, display the attributes and values of all variables.

-g create global variables when used in a shell function; otherwise ignored -l to convert NAMEs to lower case on assignment -n make NAME a reference to the variable named by its value -r to make NAMEs readonly -t to make NAMEs have the `trace' attribute -u to convert NAMEs to upper case on assignment -x to make NAMEs export Using ` ' instead of `-' turns off the given attribute.

Variables with the integer attribute have arithmetic evaluation (see the `let' command) performed when the variable is assigned a value.

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