alias - define or display aliases
alias [alias_name[=string] ...]
The alias utility creates or redefines alias definitions or writes the
values of existing alias definitions to standard output. An alias
definition provides a string value that replaces a command name when it
An alias definition affects the current shell execution environment and
the execution environments of the subshells of the current shell. When
used as specified by this specification, the alias definition will not
affect the parent process of the current shell nor any utility
environment invoked by the shell.
The following operands are supported:
alias_name Write the alias definition to standard output.
alias_name=string Assign the value of string to the alias alias_name.
If no operands are given, all alias definitions will be written to
The format for displaying aliases (when no operands or only name operands
are specified) is:
"%s=%s\n", name, value
The value string will be written with appropriate quoting so that it is
suitable for reinput to the shell.
The following exit values are returned:
0 Successful completion.
>0 One of the name operands specified did not have an alias definition,
or an error occurred.
1. Change ls to give a columnated, more annotated output:
alias ls="ls -CF"
2. Create a simple "redo" command to repeat previous entries in the
command history file:
alias r='fc -s'
3. Use 1K units for du:
alias du=du -k
4. Set up nohup so that it can deal with an argument that is itself an
alias nohup="nohup "
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