alias - define or display aliases [UP] alias [alias-
name[=string] ...] The alias utility shall create or redefine
alias definitions or write the values of existing alias
definitions to standard output. An alias definition provides a
string value that shall replace a command name when it is
encountered; see Alias Substitution. An alias definition shall
affect the current shell execution environment and the execution
environments of the subshells of the current shell. When used as
specified by this volume of IEEE Std 1003.1-2001, the alias
definition shall not affect the parent process of the current
shell nor any utility environment invoked by the shell; see
Shell Execution Environment. The following operands shall be
supported: - Write the alias definition to standard output. -
Assign the value of string to the alias alias-name. If no
operands are given, all alias definitions shall be written to
standard output. The following environment variables shall
affect the execution of alias: - Provide a default value