Does awg working in pipe like this? tail -f myLOG |grep...

FAQS.ORG makes no guarantees as to the accuracy of the posts. Each post is the personal opinion of the poster. These posts are not intended to substitute for medical, tax, legal, investment, accounting, or other professional advice. FAQS.ORG does not endorse any opinion or any product or service mentioned mentioned in these posts.

<< Back to: comp.lang.awk FAQ

[ Home | FAQ-Related Q&As | General Q&As | Answered Questions ]

Question by Petr
Submitted on 1/22/2004
Related FAQ: comp.lang.awk FAQ
Rating:	Rate this question:
Does awg working in pipe like this? tail -f myLOG \|grep "FROM docusers" \|awk -- '{print(substr($0,match($0,"SELECT")),";")}' when I replace tail -f with command cat than I got a result. But how I convince awk to work with tail -f

Answer by Gus
Submitted on 8/24/2004
Rating: Not yet rated	Rate this answer:
The problem seems to be with the "grep" step here, either closing the input or the output. Try: tail -f mylog \| awk -- '/FROM docusers/ {...}'

Answer by Gaby Pulver
Submitted on 6/13/2005
Rating: Not yet rated	Rate this answer:
Add option "-W interactive" to awk. This was formerly not required...

Answer by brothert
Submitted on 11/10/2006
Rating: Not yet rated	Rate this answer:
It works ... - but you have to be patient. Pipes buffer their data so grep won't see the lines from "tail -f" immediately. Buffers will flush after enough data has been written. This also happens between your pipe's grep and awk.

Your name or nickname:
If you'd like to create a new account or access your existing account, put in your password here:
Your answer: