alias expanded

alias expanded

alias expanded

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The term alias expansion is sometimes used to indicate a specific mode of email forwarding, thereby implying a more generic meaning of the term email alias as an address that is forwarded in a simplistic fashion.
Aliases are expanded when a command is read, not when it is executed. Therefore, an alias definition appearing on the same line as another command does not take effect until the next line of input is read.
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What are aliases?

An alias allows a string to be substituted for a word when it is used as the first word of a simple command. The shell maintains a list of aliases that may be set and unset with the alias and unalias built-in commands. Issue the alias without options to display a list of aliases known to the current shell.

Aliases are useful for specifying the default version of a command that exists in several versions on your system, or to specify default options to a command. Another use for aliases is for correcting incorrect spelling.

alias expanded
alias expanded

The first word of each simple command, if unquoted, is checked to see if it has an alias. If so, that word is replaced by the text of the alias. The alias name and the replacement text may contain any valid shell input, including shell metacharacters, with the exception that the alias name may not contain “=”. The first word of the replacement text is tested for aliases, but a word that is identical to an alias being expanded is not expanded a second time.

more :  difference between linear and non linear data structure

This means that one may alias ls to ls -F, for instance, and Bash will not try to recursively expand the replacement text. If the last character of the alias value is a space or tab character, then the next command word following the alias is also checked for alias expansion.

Aliases are not expanded when the shell is not interactive, unless the expand_aliases option is set using the shopt shell built-in.

Creating and removing aliases

Aliases are created using the alias shell built-in. For permanent use, enter the alias in one of your shell initialization files; if you just enter the alias on the command line, it is only recognized within the current shell.

An email alias is simply a forwarding email address. The term alias expansion is sometimes used to indicate a specific mode of email forwarding, thereby implying a more generic meaning of the term email alias as an address that is forwarded in a simplistic fashion.

 

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