CODEWITHSUNDEEP
grep
shantanuo
shantanuo

Reputation: 32276

Escape spaces in grep

tail /mnt/mysqld_log/mysql_error_log.err  | grep -e `date +'%y%m%d' --date='4 hour ago'` | more

120824 11:25:06 [ERROR] /usr/libexec/mysqld: Table '.zone_assoc' is marked as crashed and should be repaired
120824 18:03:23 [ERROR] /usr/libexec/mysqld: Incorrect key file for table '.ad_zone_assoc.MYI'; try to repair it
120824 18:08:38 [ERROR] /usr/libexec/mysqld: Incorrect key file for table '.ad_zone_assoc.MYI'; try to repair it

The above works as expected and shows the results for today's date. But the following does not work.

tail /mnt/mysqld_log/mysql_error_log.err  | grep -e `date +'%y%m%d %k' --date='4 hour ago'` | more

grep: 18: No such file or directory

I tried to escape the space and that did not work as well.

tail /mnt/mysqld_log/mysql_error_log.err  | grep -e `date +'%y%m%d\ %k' --date='4 hour ago'` | more

grep: Trailing backslash

Upvotes: 0

Views: 3057

Answers (1)

Eugene
Eugene

Reputation: 4879

You need to wrap the date command with quotes:

tail /mnt/mysqld_log/mysql_error_log.err  | grep -e "`date +'%y%m%d %k' --date='4 hour ago'`" | more

The space is being interpreted as the file you are trying to read from, by encasing it in quotes, this will not happen.

Upvotes: 2

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