
histexpand:tldr:7a883
The command ^${string1}^${string2}^
is a text substitution command used in some Unix-like operating systems, such as Linux.
Here's how it works:
$
is used to indicate variable expansion. It is followed by the name of the variable you want to expand.${string1}
and${string2}
are placeholder variables that should be replaced with actual strings or values.
The command performs a search and replace operation on the previous command you executed in your shell session. It looks for the first occurrence of string1
in that command and replaces it with string2
.
For example, let's say you executed the following command previously: echo hello world
. If you run ^hello^hi^
, it will search for the first occurrence of hello
in the previous command and replace it with hi
. So the updated command would be echo hi world
and it will be executed.
It's a convenient way to quickly modify and re-execute previous commands without retyping everything. However, it should be used with caution as it modifies the original command and may have unintended consequences if not used carefully.