commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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-N removes header
-s removes separator chars
-r raw output
After using these options, the MySQL ouptut can be used with pipes very easily
The file .my.cnf located at user's home directory is used for mysql login. If this file exists, then
mysql -uYOURUSERNAME -pYOURPASSWORD database -e 'SOME SQL COMMAND'
can be replaced with
mysql database -e 'SOME SQL COMMAND'
It saves you from typing!
This is valid for mysqladmin and mysqldump commands as well.
Be aware of using the --password argument as it will appear your password in plain text on the screen. You may use -p argument instead, it will prompt you to enter you password in hidden mode.
This loops through all tables and changes their collations to UTF8. You should backup beforehand though in case some data is lost in the process.
Useful for monitoring both MySQL and the server load at the same time.
I have this on a daily cronjob to backup the commandlinefu.com database from NearlyFreeSpeech.net (awesome hosts by the way) to my local drive. Note that (on my Ubuntu system at least) you need to escape the % signs on the crontab.
Watch is a very useful command for periodically running another command - in this using mysqladmin to display the processlist. This is useful for monitoring which queries are causing your server to clog up.