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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.
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I use this to generate a playlist with all the podcasts I listen to.
Ordered from most recent to older.
The pipe to head removes the listing of . as the largest directory.
Useful for cron jobs -- all output will be logged but only errors will cause email to be sent. NB the order of "2>&1" and ">> logfile" is important, it doesn't work if you reverse them (everything goes to the logfile, nothing left for tee).
You can use this command to delete CVS/svn folders on given project.
Thanks for the comments
This download a complete audio podcast
This find files of name like *.log and truncates them.
if you need see progress of long dd command, enter subj on other console
The -R flag prevents you from making changes to a file, useful when you only want to view the file. This command is nicer than the 'more' or 'less' commands because for source codes, vi shows syntax highlight.
* The date command evaluated to today's date with blank padded on the left if single digit
* The grep command search and highlight today's date
* The --before-context and --after-context flags displays up to 6 lines before and after the line containing today's date; thus completes the calendar.
I have tested this command on Mac OS X Leopard and Xubuntu 8.10
Waiting for your server to finish rebooting? Issue the command above and you will hear a beep when it comes online. The -i 60 flag tells ping to wait for 60 seconds between ping, putting less strain on your system. Vary it to your need. The -a flag tells ping to include an audible bell in the output when a package is received (that is, when your server comes online).
On Linux and Mac systems (I have not tested with other Unix systems), the ping command will keep on pinging until the user interrupts it with Ctrl+C. On Windows system, ping will execute for a number of times then quit. The -c flag on Linux and Mac will make this happen
Unreachable_host is unavailable from local network, but it's available from reachable_host's network. This command creates a connection to unreachable_host through "hidden" connection to reachable_host.
You need jhead package.
recursively traverse the directory structure from . down, look for string "oldstring" in all files, and replace it with "newstring", wherever found
grep -rl oldstring . |xargs perl -pi~ -e 's/oldstring/newstring'
Look for an rpm that supplies a specific file that you don't yet have installed.
extremely useful when you need something and don't know where it is.. or what its called.
note: uses grep like syntax.
You may also use +line:column syntax.
This command checks for the number of times when someone has tried to login to your server and failed. If there are a lot, then that user is being targeted on your system and you might want to make sure that user either has remote logins disabled, or has a strong password, or both. If your output has an "invalid" line, it is a summary of all logins from users that don't exist on your system.