Commands tagged shell

If you want to copy all files listed (with full path) in a text-file (i.e. cmus playlist.pl) to a certain directory use this nice oneliner...

Credits goes to RiffRaff: http://www.programmingforums.org/post242527-2.html

Use 'ctrl-@' to set a mark. See the first comment for a better explanation.

Super fast way to ftp/telnet/netcat/ssh/ping your loopback address for testing. The default route 0.0.0.0 is simply reduced to 0.

Using the output of 'ps' to determine CPU usage is misleading, as the CPU column in 'ps' shows CPU usage per process over the entire lifetime of the process. In order to get *current* CPU usage (without scraping a top screen) you need to pull some numbers from /proc/stat. Here, we take two readings, once second apart, determine how much IDLE time was spent across all CPUs, divide by the number of CPUs, and then subtract from 100 to get non-idle time.

Could easily be used for lowercase --> ((i=97;i

Find installed network devices.

If you want to carry on your aliases while using sudo, put this into a file which will be parsed when logging in.

Sometimes, you don't want to just replace the spaces in the current folder, but through the whole folder tree - such as your whole music collection, perhaps. Or maybe you want to do some other renaming operation throughout a tree - this command's useful for that, too.

To rename stuff through a whole directory tree, you might expect this to work:

for a in `find . -name '* *'`;do mv -i "$a" ${a// /_};done

No such luck. The "for" command will split its parameters on spaces unless the spaces are escaped, so given a file "foo bar", the above would not try to move the file "foo bar" to "foo_bar" but rather the file "foo" to "foo", and the file "bar" to "bar". Instead, find's -execdir and -depth arguments need to be used, to set a variable to the filename, and rename files within the directory before we rename the directory.

It has to be -execdir and won't work with just -exec - that would try to rename "foo bar/baz quux" to "foo_bar/baz_quux" in one step, rather than going into "foo bar/", changing "baz quux" to "baz_quux", then stepping out and changing "foo bar/" into "foo_bar/".

To rename just files, or just directories, you can put "-type f" or "-type d" after the "-depth" param.

You could probably safely replace the "mv" part of the line with a "rename" command, like rename 'y/ /_/' *, but I haven't tried, since that's way less portable.

Must be run as root.

The 'tomcat' user must have access to the .keystore file.

The key and keystore passwords must be the same.

The password must be entered into the server.xml config file for Tomcat.

Read and execute commands from FILENAME in the current shell. The entries in $PATH are used to find the directory containing FILENAME. If any ARGUMENTS are supplied, they become the positional parameters when FILENAME is executed.

Continue a current job in the background and detach it from current terminal

no need to reinvent the wheel.

Thanks to the OP for the "obsolete" hint. 'declare' may come in pretty handy on systems paranoid about "up-to-dateness"

Often times you run a command in the terminal and you don't realize it's going to take forever. You can open a new terminal, but you lose the local history of the suspended one. You can stop the running command using , but that may produce undesirable side-effects. suspends the job, and (assuming you have no other jobs running in the background) %1 resumes it. Appending & tells it to run in the background.

You now have a job running concurrently with your terminal. Note this will still print any output to the same terminal you're working on.

Tested on zsh and bash.

Cleans all files in /tmp that have been accessed at least 2 days ago.

Unpack and build a WebLogic 9 or 10 domain

extension to tali713's random fact generator. It takes the output & sends it to notify-osd. Display time is proportional to the lengh of the fact.

Though without infinite time and knowledge of how the site will be designed in the future this may stop working, it still will serve as a simple straight forward starting point.

This uses the observation that the only item marked as strong on the page is the single logical line that includes the italicized fact.

If future revisions of the page show failure, or intermittent failure, one may simply alter the above to read.

The file lastfact, can then be examined whenever the command fails.

Connect-back shell using Bash built-ins. Useful in a web app penetration test, if it's the case of a locked down environment, without the need for file uploads or a writable directory.

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/dev/tcp and /dev/udb redirects must be enabled at compile time in Bash.

Most Linux distros enable this feature by default but at least Debian is known to disable it.

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http://labs.neohapsis.com/2008/04/17/connect-back-shell-literally/