What are the ways to replace Shell commands?

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Command replacement (command substitution) means that Shell executes a command and replaces the command replacement portion with the result of executing the command.

There are two ways to replace commands:

1. Use backtick symbols (I. e., backquotes, accents).

The code is as follows:

For i in `cd / old/code/dir; echo * .c`

Do

Diff-c / old/code/dir/$i $I | more

Done

two。 Use $(…) The way.

The code is as follows:

For i in $(cd / old/code/dir; echo * .c)

Do

Diff-c / old/code/dir/$i $I

Done | more

Note: when using the first method, both embedded backtick symbols and double quotes need to be escaped. In the second way, embedded parentheses do not need to be escaped.

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