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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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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'
This command kills all processes with 'SomeCommand' in the process name. There are other more elegant ways to extract the process names from ps but they are hard to remember and not portable across platforms. Use this command with caution as you could accidentally kill other matching processes!
xargs is particularly handy in this case because it makes it easy to feed the process IDs to kill and it also ensures that you don't try to feed too many PIDs to kill at once and overflow the command-line buffer.
Note that if you are attempting to kill many thousands of runaway processes at once you should use 'kill -9'. Otherwise the system will try to bring each process into memory before killing it and you could run out of memory. Typically when you want to kill many processes at once it is because you are already in a low memory situation so if you don't 'kill -9' you will make things worse
These part of the command:
svn status | grep '^\?' => find new file or directory on working copy
sed -e 's/^\?//g' => remove "^" character on the first character of file name
xargs svn add => add file to subversion repository
You can modify above command to other circumtances, like revert addition files or commit files that have been modified. ^_^
Output: Version 3.2-0 (for example if you type # aptitude show bash | grep Vers
Depends on the language of your distribution, because the name of the word "Version" in other languages may be different.
This command will list a CSV list of infected files detected by clamav through squidclamav redirector.
Show only the subdirectories in the current directory. In the example above, /lib has 135 files and directories. With this command, the 9 dirs jump out.
rpm, sometimes, is not wildcard friendly. To search files installed from package this could be useful.
change PACKAGENAME to any package do you want to search
This command gives a model information of a computer. Also useful in determining the host is a VM machine or actual physical machine.
Useful in scripts while you just need an IP address in a variable.
I've had this as mute.sh in my ~/bin/ for some time.
greps for search word in directory and below (defaults to cd).
-i case insensitive
-n shows line number
-H shows file name
Note that the file at the given path will have the contents of the (still) deleted file, but it is a new file with a new node number; in other words, this restores the data, but it does not actually "undelete" the old file.
I posted a function declaration encapsulating this functionality to http://www.reddit.com/r/programming/comments/7yx6f/how_to_undelete_any_open_deleted_file_in_linux/c07sqwe (please excuse the crap formatting).
If the 'lm' flag is present, then the CPU is 64-bit.
If no output, then CPU is 32-bit.
From 'man netstat'
"netstat -i | -I interface [-abdnt] [-f address_family] [-M core] [-N system]
Show the state of all network interfaces or a single interface
which have been auto-configured (interfaces statically configured
into a system, but not located at boot time are not shown). An
asterisk (``*'') after an interface name indicates that the
interface is ``down''. If -a is also present, multicast
addresses currently in use are shown for each Ethernet interface
and for each IP interface address. Multicast addresses are shown
on separate lines following the interface address with which they
are associated. If -b is also present, show the number of bytes
in and out. If -d is also present, show the number of dropped
packets. If -t is also present, show the contents of watchdog