In the context where an assignment statement is assigning a value to a shell variable or array index, the += operator can be used to append to or add to the variable's previous value. When += is applied to a variable for which the integer attribute has been set, value is evaluated as...
Each variable assignment is checked for unquoted instances of tildes following a : or =. In these cases, tilde sub stitution is also performed. Consequently, one may use pathnames with tildes in assignments to PATH, MAILPATH, and CDPATH, and the shell assigns the expanded value. Parameter...
variable arrays with new compound assignment syntax redirections: <>, &>, >|, <<<, [n]<&word-, [n]>&word- prompt string special char translation and variable expansion auto-export of variables in initial environment command search finds functions before builtins bash return builtin will exit...
Assignment to this variable will not change the current directory. If DIRSTACK is unset, it loses its special cial properties, even if it is subsequently reset. EUID Expands to the effective user ID of the current user, initialized at shell startup. This variable is readonly. FUNCNAME An ...
This option will make the Bash shell only read the commands but will not execute them, neither will it do a variable assignment. In short, this is a basic “no-op” or “dry run” mode. ⚠️ Once the noexec option is executed by the set builtin command, any other commands after...
When += is applied to an array variable using compound assignment (see Arrays below), the variable's value is not unset (as it is when using =), and new values are appended to the array beginning at one greater than the array's maximum index (for indexed arrays) or added as ...
expr:exprconditional operator=, *=, /=, %=,+=, -=, <<=, >>=,&=, ^=, |=assignment Shell variables are allowed as operands. The name of the variable is replaced by its value (coerced to a fixed-width integer) within an expression. The variable need not have its integer attribute...
conditionaloperator =,*=,/=,%=, +=,-=,<<=,>>=, &=,^=,|=assignment Shellvariables are allowedasoperands.Thename of the variable isreplacedbyits value(coerced to afixed-width integer)within an expression.Thevariable neednothave its integer attribute ...
variable arrays with new compound assignment syntax redirections: <>, &>, >|, <<<, [n]<&word-, [n]>&word- prompt string special char translation and variable expansion auto-export of variables in initial environment command search finds functions before builtins ...
2. String Variable Declaration and Assignment Bash doesn’t have a type system, all variables are strings. However, variables can have attributes that change or constrain their behavior that can be beneficial even when dealing with strings. 2.1. Declaration A simple declaration and value assignment...