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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,…):
Subscribe to the feed for:
Shows all linked file and destinations. The 'ls -l' command lists the files in long (1 file per line) format, and the grep command displays only those lines that starts with an l (lower case L) -- a linked file.
Updated: Remove reference to hard links because this command does not apply to hard link as others kindly pointed out.
Reads a username from
You can use this to loop any command to periodically see the output.
while true; do [YOUR COMMAND HERE]; sleep [# of seconds]; done;
Alternatively, you can put it in a simple shell script to save typing!
while true; do $1; sleep $2; done;
/path/to/script.sh "ifconfig eth0 | grep 'inet addr:'" 60
I used this to confirm an upgrade to an SSH daemon was successful
Sys Temp: +11.0?C
CPU Temp: +35.5?C
AUX Temp: +3.0?C
Look for a string in one of your codes, excluding the files with svn and ~ (temp/back up files). This can be useful when you're looking for a particular string in one of your source codes for example, inside a directory which is under version control (e.g. svn), removing all the annoying files with ~ (tilde) from the search. you can even change the command after -exec to delete (rm) or view (cat) files found by 'find' for example
Searches /var/log/secure for smtp connections then lists these by number of connections made and hosts.
Searches the /var/log/secure log file for Failed and/or invalid user log in attempts.
If (when) you forget to "svn rm" files from your repository, use this to let your repository know you want those files gone. Of course this works with adding and reverting too.
Several times, I find myself hitting my up arrow, and changing the search term. Unfortunately, I find myself wasting too much time typing:
grep kernel /var/log/messages
Redirecting STDIN allows me to put the search term at the end so I less cursor movement to change what I'm searching for:
< /var/log/messages grep kernel
If you're using the emacs keyboard binding, then after you press your up arrow, press CTRL+w to erase the word.
If this has already been submitted, I couldn't find it with the search utility.
On Fedora clean the boot directory; erase older kernel
A quick way to list services running
This command will replace all instances of 'foo' with 'bar' in all files in the current working directory and any sub-directories.
This command will replace all instances of 'foo' with 'bar' in all files in the current working directory.
Allows you to save progress without committing.
To revert to an undo point, svn revert then apply the undo point with patch.
svn revert -R . && patch -p0 < .undo/2009-03-27_08:08:11rev57
faster than lsof by at least x2 on my box.