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46 lines
1.3 KiB
Groff
46 lines
1.3 KiB
Groff
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.TH ALIAS 1 "31 August 1996" GNO "Commands and Applications"
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.SH NAME
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.LP
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alias - define alternate command name (gsh builtin)
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.SH SYNOPSIS
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.LP
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.B alias
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[ name command ]
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.SH DESCRIPTION
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.LP
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The shell maintains a list of aliases that you can create, display,
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and modify using the
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.B alias
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and
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.B unalias
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commands.
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The shell checks the first word in each command to see if it matches
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the name of an existing alias.
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If it does, the command is reprocessed
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with the alias definition replacing its name; the history
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substitution mechanism is made available as though that command
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were the previous input line.
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This allows history substitutions,
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escaped with a backslash in the definition, to be replaced with
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actual command-line arguments when the alias is used.
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If no
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history substitution is called for, the arguments remain unchanged.
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.LP
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Aliases can be nested.
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That is, an alias definition can contain
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the name of another alias.
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Nested aliases are expanded before any
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history substitutions is applied.
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This is useful in pipelines such as
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.IP
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alias lm "ls \-l | more"
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.LP
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which when called, pipes the output of
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.BR ls (1)
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through
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.BR more (1).
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.LP
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Except for the first word, the name of the alias may not appear in its
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definition, nor in any alias referred to by its definition.
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Such loops are detected, and cause an error message.
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