stdout, stderr, and what else? (going insane parsing slapadd output)
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Published on 2011-11-30T09:58:05Z
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2011/11/30
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I am using slapadd to restore a backup. That backup contains 45k entries which takes a while to restore so I need to get some progress update from slapadd. Luckily for me there is the -v switch which gives an output similar to this one:
added: "[email protected],ou=People,dc=example,dc=org" (00003d53) added: "[email protected],ou=People,dc=example,dc=org" (00003d54) added: "[email protected],ou=People,dc=example,dc=org" (00003d55) .######## 44.22% eta 05m05s elapsed 04m spd 29.2 k/s added: "[email protected],ou=People,dc=example,dc=org" (00003d56) added: "[email protected],ou=People,dc=example,dc=org" (00003d57) added: "[email protected],ou=People,dc=example,dc=org" (00003d58) added: "[email protected],ou=People,dc=example,dc=org" (00003d59)
Every N entries added, slapadd writes a progress update output line (.######## 44.22% eta 05m05s elapsed ...) which I want to keep and an output line for every entry created which I want to hide because it exposes people's email address but still want to count them to know how many users were imported
The way I thought about hiding emails and showing the progress update is this:
$ slapadd -v ... 2>&1 | tee log.txt | grep '########'
# => would give me real-time progress update
$ grep "added" log.txt | wc -l
# => once backup has been restored I would know how many users were added
I tried different variations of the above, and whatever I try I can't grep the progress update output line.
I traced slapadd as follows:
sudo strace slapadd -v ...
And here is what I get:
write(2, "added: \"[email protected]"..., 78added: "[email protected],ou=People,dc=example,dc=org" (00000009)
) = 78
gettimeofday({1322645227, 253338}, NULL) = 0
_######## 44.22% eta 05m05s elapsed 04m spd 29.2 k/s ) = 80
write(2, "\n", 1
)
As you can see, the percentage line isn't sent to either stdout or stderr (FYI I have validated with known working and failing commands that 2 is stderr and 1 is stdout)
Q1: Where is the progress update output line going?
Q2: How can I grep on it while sending stderr to a file?
Additional info: I'm running Openldap 2.4.21 on ubuntu server 10.04
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