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Updated SC2139 (markdown)

koalaman
2017-04-02 15:14:35 -07:00
parent c91f068550
commit db553bf16f
1 changed files with 9 additions and 1 deletions
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SC2139.md

@@ -18,6 +18,14 @@ With double quotes, this particular alias will be defined as `echo /home/me`, so
By using single quotes or escaping any expansions, we define the alias as `echo $PWD`, which will be expanded when we use the alias. This is the far more common use case.
Note that even if you expect that the variable will never change, it may still be better to quote it. This prevents a second round of evaluation later:
default="Can't handle failure, aborting"
trap "echo $default; exit 1" err
false
The trap now has a syntax error, because instead of running `echo $default`, it runs `echo Can't handle ..` which has an unmatched single quote. Avoid early expansion unless you're equally comfortable putting `eval` in there.
### Exceptions
If you don't mind that your alias definition is expanded at define time, you can ignore this warning.
If you don't mind that your alias definition is expanded at define time (and its result expanded again at evaluation time), you can ignore this warning.