Bug 42282
| Summary: | read command does not accept input from pipe. | ||
|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | Lisa Rojas <ladycomix> |
| Component: | bash | Assignee: | Bernhard Rosenkraenzer <bero> |
| Status: | CLOSED DUPLICATE | QA Contact: | David Lawrence <dkl> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.1 | ||
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2001-05-25 15:02:58 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
This is what the Single UNIX spec says:
"Some systems have implemented the last stage of a pipeline in the current
environment so that commands such as:
command | read foo
set variable foo in the current environment. This extension is allowed, but not
required; therefore, a shell programmer should consider a pipeline to be in a
subshell environment, but not depend on it."
And 'man bash' (line 277) says:
"Each command in a pipeline is executed as a separate process (i.e., in a
subshell)."
So it isn't really a bug in bash, as far as I can see.
*** This bug has been marked as a duplicate of 19747 ***
|
From Bugzilla Helper: User-Agent: Mozilla/4.7 [en]C-CCK-MCD {LabCorp} (Win95; U) Description of problem: Simplified version ********************************* echo 1 | read a echo $a ******************* The variable a does not come out as the expected 1. Instead, the variable is unset. Note this problem also appears in pdksh. How reproducible: Always Steps to Reproduce: 1. echo 1 |read a 2.echo a 3. Actual Results: variable is not set. Expected Results: Variable should be set to 1 in the example. Additional info: