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Updated SC2048 (markdown)

Vidar Holen
2021-04-24 16:05:10 -07:00
parent 5dc39d699c
commit 41d86317ab
1 changed files with 8 additions and 4 deletions
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SC2048.md

@@ -1,26 +1,30 @@
## Use "$@" (with quotes) to prevent whitespace problems.
Or: Use "${array[@]}" (with quotes) to prevent whitespace problems.
### Problematic code:
```sh
cp $* ~/dir
cp ${array[*]} ~/dir
```
### Correct code:
```sh
cp "$@" ~/dir
cp "${array[@]}" ~/dir
```
### Rationale:
`$*`, unquoted, is subject to word splitting and globbing.
`$*` and `${array[*]}`, unquoted, is subject to word splitting and globbing.
Let's say you have three arguments: `baz`, `foo bar` and `*`
Let's say you have three arguments or array elements: `baz`, `foo bar` and `*`
`"$@"` will expand into exactly that: `baz`, `foo bar` and `*`
`"$@"` and `"${array[@]}" `will expand into exactly that: `baz`, `foo bar` and `*`
`$*` will expand into multiple other arguments: `baz`, `foo`, `bar`, `file.txt` and `otherfile.jpg`
`$*` and `${array[*]}` will expand into multiple other arguments: `baz`, `foo`, `bar`, `file.txt` and `otherfile.jpg`
Since the latter is rarely expected or desired, ShellCheck warns about it.