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Updated SC1138 (markdown)

Rushen Wang
2024-09-12 09:57:35 +08:00
parent 702f6917bf
commit 659bfd31dc
1 changed files with 4 additions and 15 deletions
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SC1138.md

@@ -1,30 +1,19 @@
## Shells are space sensitive. Use `< <(cmd)`, not `<< (cmd)`. ## Remove spaces between (( in arithmetic for loop.
### Problematic code: ### Problematic code:
```sh ```sh
while read -r line for( (i=0; i<10; i++) ); do echo $i; done
do
echo "You said: $line"
done <<(cmd)
``` ```
### Correct code: ### Correct code:
```sh ```sh
while read -r line for((i=0; i<10; i++)); do echo $i; done
do
echo "You said: $line"
done < <(cmd)
``` ```
### Rationale: ### Rationale:
When redirecting `<` from a process substitution `<(cmd)`, make sure there is a space between the two `<` characters as shown in the example. ShellCheck finds arithmetic for ((;;)) expressions where (( or )) are intervening with spaces
With a space `cmd1 < <(cmd2)`, is correctly interpreted as "run cmd1, reading stdin from cmd2, without forking for a pipeline".
Without a space, `<<` is incorrectly considered a here document, and `(cmd2)` is an invalid delimiter token.
### Exceptions: ### Exceptions: