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Updated SC2216 (markdown)

koalaman
2017-07-03 16:02:37 -07:00
parent 3036bd8f85
commit a436bef6e9
1 changed files with 8 additions and 4 deletions
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SC2216.md

@@ -1,20 +1,24 @@
## Piping to 'echo', a command that doesn't read stdin. Wrong command or missing xargs? ## Piping to 'rm', a command that doesn't read stdin. Wrong command or missing xargs?
### Problematic code: ### Problematic code:
```sh ```sh
find . -type f | echo "Results: " ls | echo # Want to print result
cat files | rm # Want to delete items from a file
find . -type f | xargs cp dir # Want to process 'find' output
``` ```
### Correct code: ### Correct code:
```sh ```sh
find . -type f -print0 | xargs -0 echo "Results: " ls
cat files | while IFS= read -r file; do rm -- "$file"; done
find . -type f -exec cp {} dir \;
``` ```
### Rationale: ### Rationale:
You are redirecting to one of several commands that don't read from stdin. You are piping to one of several commands that don't read from stdin.
This may happen when: This may happen when: