Question

The corrupt table entry is logged in the error file something like this…

/usr/local/mysql/bin/mysqld: Incorrect
key file for table
‘./accounts/headers.MYI’; try to
repair it

I want to write a query that will repair this table.

REPAIR TABLE accounts.headers;

What I need to do is search for the first instance of “./” and select the first word i.e. “accounts” and choose the next word “headers”.
Now use these two variables to write a statement like shown above.
Should I write a Shell script for this purpose?

Answer 1

You can use grep and sed to do this:

pax> cat qq.in
/blah: Incorrect key file for table './accounts/headers.MYI'; try blah
/blah: Incorrect key file for table './pax/diablo.myi'; try blah

pax> grep 'Incorrect key file for ' qq.in | sed
     -e 's/.*\.\//REPAIR TABLE /g'
     -e 's/\//./'
     -e 's/\.[Mm][Yy][Ii].*/;/g'
REPAIR TABLE accounts.headers;
REPAIR TABLE pax.diablo;

Note that I’ve put all those -e sections on different lines for readability. They should be all on one line to test.

If your version of sed supports case-insensitive searches (like the GNU one does), you can replace that last substitution with 's/\.myi.*/;/Ig'.

---

To catch lines with different foramts is a bit trickier and will require all the formats to be known to avoid false positives. The following command will catch the alternate format as supplied in your comment:

pax> cat qq.in
/blah: Incorrect key file for table './accounts/headers.MYI'; try blah
/blah: Incorrect key file for table './linus/torvalds.myi'; try blah
/usr/local/mysql/bin/mysqld: Table './beta/search_data' is marked as crashed

allachan@IBM-L3F3936 ~
$ egrep 'Incorrect key|as crashed' qq.in | sed
    -e "s/.*\.\//REPAIR TABLE /g"
    -e "s/[\\.'].*/;/g"
    -e "s/\//./"
REPAIR TABLE accounts.headers;
REPAIR TABLE linus.torvalds;
REPAIR TABLE beta.search_data;