Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Setting up local username and email with git
Answer:
Before you make any changes to a local git repos, it is always recommended to setup you username and email first.
To do so, use the commands below:
# git config --global user.name "John Doe"
# git config --global user.email [email protected]That's it.
Enable cron log in Ubuntu 10.04 (Lucid Lynx)
Answer:
By default, the output from cron goes into the default general system log "/var/log/syslog" in Ubuntu.
If you prefer to have an unique file for cron log, you can edit the file "/etc/rsyslog.d/50-default.conf"
Uncomment the line (Remove the #):
#cron.*
And finally restart the log service
# service rsyslog restart
Revert the effect of an earlier changeset in Mercurial
Answer:
In Mercurial, if you want to revert the effect of an earlier changeset, even the changes have been pushed to remote, it is still possible with the hg backout command.
1. Find the revision you want to backout using hg log
# hg log
2. Assume you want to backout to the revision 99, then you can
# hg backout -r 99
Printing the exclamation mark using echo
Answer:
You might observed a problem when you try to print the exclamation mark (!) using the echo command
E.g.
# echo "test!"
-bash: !": event not foundTo solve it, you can use single quote instead
# echo 'test!'
test!How to perform hot backup for InnoDB?
Answer:
You can buy the official backup tool - "InnoDB Hot Backup" if you have the money. But you can also use the free alternative - the Percona XtraBackup
To download and install, you can refer to their web site: http://www.percona.com/docs/wiki/percona-xtrabackup:installation:binaries
To perform a quick and simple backup, you need:
# sudo xtrabackup --defaults-file=/etc/mysql/my.cnf --backup --target-dir=/tmp/backup --datadir=/var/lib/mysql
