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jzinn
2018-06-04 21:42:06 -07:00
parent 7ec0df9cbc
commit ad41991bff
1 changed files with 2 additions and 2 deletions
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SC2145.md

@@ -26,7 +26,7 @@ If the intention is to provide each array element as a separate argument, put th
Concatenating a string with an array can be used to make a command line interface with subcommands. Concatenating a string with an array can be used to make a command line interface with subcommands.
To implement the subcommand interface, first pick a prefix like `subcommand_` below for the function names that implement the subcommands. Then protect the parsing of the subcommands by listing them as patterns of a case statement. In the body of the case statement, a concatenation of the prefix with `"$@"` will invoke the subcommand function and pass the rest of the parameters to the function. To implement the subcommand interface, first pick a prefix like `subcommand_` below for the names of the functions that implement the subcommands. Then protect the parsing of the subcommands by listing them as patterns of a case statement. In the body of the case statement, a concatenation of the prefix with `"$@"` will invoke the subcommand function and pass the rest of the parameters to the function.
For example: For example:
```sh ```sh
@@ -58,4 +58,4 @@ main() {
main foo aaa bbb main foo aaa bbb
``` ```
In the above example, inside the `main` function, the value of `"$@"` is `( foo aaa bbb ccc )`. The value of `subcommand_"$@"` after expansion is `( subcommand_foo aaa bbb ccc )`, which the shell interprets as a call to the `subcommand_foo` function with parameters `aaa`, `bbb`, and `ccc`. In the above example, inside the `main` function, the value of `"$@"` is `( foo aaa bbb ccc )`. The value of `subcommand_"$@"` after expansion is `( subcommand_foo aaa bbb ccc )`, which the shell interprets as a call to `subcommand_foo` with parameters `aaa`, `bbb`, and `ccc`.