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In computing, aliasing describes a situation in which a data location in memory can be accessed through different symbolic names in the program. Thus, modifying the data through one name implicitly modifies the values associated with all aliased names, which may not be expected by the programmer. As a result, aliasing makes it particularly difficult to understand, analyze and optimize programs. Aliasing analysers intend to make and compute useful information for understanding aliasing in programs.
aliasis a shell command that defines a word that the shell replaces with associated text before interpreting a command line. It is often used to enhance productivity by abbreviating a command or for including commonly used arguments with a command. The command is available in Unix shells, AmigaDOS, 4DOS/4NT, FreeDOS, KolibriOS, PowerShell, ReactOS, EFI shell, and IBM i. Aliasing functionality in MS-DOS and Command Prompt is provided by theDOSKEYcommand.Since aliases are defined only for a shell session, regularly used aliases are often defined in a session startup shell script such as
.bashrc. Thealiascommands may either be written in the config script directly or sourced from a separate file.Aliases were introduced in the C shell to survive in descendant shells such as tcsh and bash. As these aliases were limited to one line they were useful for creating relatively simple shortcut commands, but not more complex constructs. Older versions of the Bourne shell did not offer aliases, but did provide functions, which are more powerful than the csh alias. Eventually, the csh alias was implemented in the bash and ksh shells. With shells that support both functions and aliases but no parameterized inline shell scripts, the use of functions wherever possible is recommended. Nonetheless, aliases are necessary where chained aliases are required.
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