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output redirection with process substitution asynchronous?
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From: |
pjodrr |
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Subject: |
output redirection with process substitution asynchronous? |
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Date: |
Fri, 4 Dec 2009 07:28:07 -0800 (PST) |
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User-agent: |
G2/1.0 |
Hello,
how can I prefix every line of output of some command with a
timestamp? I thought like this:
$ exec 3> >(while read line; do echo "$(date): $line"; done)
$ seq 4 >&3
Friday, December 4, 2009 4:20:29 PM MET: 1
$ Friday, December 4, 2009 4:20:29 PM MET: 2
Friday, December 4, 2009 4:20:29 PM MET: 3
Friday, December 4, 2009 4:20:29 PM MET: 4
please note that the prompt ($) returns before the command completes.
Why is the
process substitution asynchronous?
Does anybody know of a better way to accomplish this?
Thanks,
Peter