Bug 1298499 - q command does not immediately quit
q command does not immediately quit
Product: Fedora
Classification: Fedora
Component: sed (Show other bugs)
x86_64 Linux
unspecified Severity medium
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Assigned To: pstodulk
Fedora Extras Quality Assurance
Depends On:
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Reported: 2016-01-14 04:42 EST by Robin Green
Modified: 2016-07-07 11:34 EDT (History)
4 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2016-07-07 11:34:02 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description Robin Green 2016-01-14 04:42:40 EST
Description of problem:
The info page for sed says that the q command immediately quits. However, it doesn't.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
(echo 'PostgreSQL init process complete; ready for start up.'; sleep 3; echo foo)|sed -n -e '/PostgreSQL init process complete/q'

Actual results:
Output is correct (no output) but it takes 3 seconds

Expected results:
Should return instantly

Additional info:
Same bug happens with Q, or Q 1
Comment 1 Paolo Bonzini 2016-07-07 11:34:02 EDT
sed does quit immediately, but the shell doesn't exit until the whole pipeline is done.  Try this:

$ (echo 'PostgreSQL init process complete; ready for start up.'; sleep 3;
     echo foo)|(sed -n -e '/PostgreSQL init process complete/q'; echo bar)

And you'll see that "bar" is printed immediately.

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