mussh - Multihost SSH wrapper

2010-05-25 1 min read Bash Fedora Linux

Description:

Mussh is a <a class="zem_slink freebase/en/shell_script" title="Shell script" rel="wikipedia" href="http://en.wikipedia.org/wiki/Shell_script">shell script that allows you to execute a command or script over ssh on multiple hosts with one command. When possible mussh will use <a class="zem_slink freebase/en/ssh-agent" title="Ssh-agent" rel="wikipedia" href="http://en.wikipedia.org/wiki/Ssh-agent">ssh-agent and RSA/DSA keys to minimize the need to enter your password more than once.

It is a utility for <a class="zem_slink freebase/en/system_administrator" title="System administrator" rel="wikipedia" href="http://en.wikipedia.org/wiki/System_administrator">system administrators maintaining more than one hosts. The utility will help the admin to execute the same command on multiple hosts with a single command.

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Menu driven ssh.

2010-05-24 1 min read Bash

I have quite a lot of servers where I need to ssh at workplace and I generally don&#8217;t remember all of them, so I wrote a simple yet useful script. In all the servers I have already copied my key so I dont need a password to login. Without much ado, here is the script.

echo &#8221;Enter the server name:&#8221;
echo &#8221;1. redhat&#8221;
echo &#8221;2. fedora&#8221;

read server

if [ &#8221;$server&#8221; = &#8221;1&#8221; ]; then
ssh amit@redhat
else if [ &#8221;$server&#8221; = &#8221;2&#8221; ]; then
ssh amit@fedora
else
echo &#8221;Not a valid choice&#8221;
fi
fi

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The power of find command in Linux – advanced.

2010-05-24 2 min read Linux

Generally whoever uses Linux, would know about the find command. Find the man page <a href="http://amit.themafia.info/phpMan.php?parameter=find&mode=man" target="_blank">here.

There are also lots of blogs, tutorials and other articles on find command on the web, so why write another one. Because it&#8217;s worth every word spent on it 🙂
find is a very powerful command, let&#8217;s see how (options for find command from man page and usage):

depth — Process each directory&#8217;s contents before the directory itself.
maxdepth — Descend at most <span style="text-decoration: underline;">levels (a non-negative integer) levels of directories below the command line arguments.
xdev — Don&#8217;t descend directories on other filesystems.
executable — Matches files which are executable and directories which are searchable (in a file name resolution sense).
This takes into account access control lists and other permissions artefacts which the -perm test ignores.
iname — Like -name, but the match is case insensitive.
nogroup — No group corresponds to file&#8217;s numeric group ID.
nouser — No user corresponds to file&#8217;s numeric user ID.
fls <span style="text-decoration: underline;">file — True; like -ls but write to <span style="text-decoration: underline;">file like -fprint.
ok <span style="text-decoration: underline;">command — Like -exec but ask the user first (on the standard input);
print0 — True; print the full file name on the standard output, followed by a null character
(instead of the newline character that -print uses).
printf <span style="text-decoration: underline;">format — True; print <span style="text-decoration: underline;">format on the standard output, interpreting &#8217;&#8217; escapes and &#8217;%&#8217; directives.

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Inotify Example - Introduction to Inotify with a C Program Example

2010-05-24 1 min read C Programs Learning Linux

<a href="http://www.thegeekstuff.com/2010/04/inotify-c-program-example/">Inotify Example: Introduction to Inotify with a C Program Example:

<a class="zem_slink freebase/en/inotify" href="http://en.wikipedia.org/wiki/Inotify" title="Inotify" rel="wikipedia">inotify utility is an effective tool to monitor and notify <a class="zem_slink freebase/en/file_system" href="http://en.wikipedia.org/wiki/File_system" title="File system" rel="wikipedia">filesystem changes. You can specify a list of files and directories that needs to be monitored by inotify. This <a class="zem_slink freebase/guid/9202a8c04000641f8000000000023d0f" href="http://en.wikipedia.org/wiki/Library" title="Library" rel="wikipedia">library is used by various other programs. For example, <a class="zem_slink freebase/en/cpan" href="http://www.cpan.org/" title="CPAN" rel="homepage">CPAN module Linux::Inotify is developed based on this library.
iNotify Execution Flow

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LPI Certification help and tutorials

2010-05-20 1 min read Fedora Learning

For the last couple of days I have been very busy but not too away from my desktop. Though I did not get time to publish anything. Here&#8217;s one of my other favourite distributions. Its known as elpicx. This distribution is oriented towards LPI certification exams and contains some documents and links that are quite helpful.

Good thing is now it supports F9 with KDE.

I found that the documents in the distro are GPL and thus I dont think that there should be any issue in re-distributing the pdfs and the links, so <a href="http://amit.with-linux.com/elpicx/" target="_blank">here it is. If you find anything in these docs or links that I should not link or upload them, let me know. I wil remove them.

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Startup animation and theme for Fedora 12 onwards.

2010-05-20 1 min read Fedora Learning Linux

Since the release of <a class="zem_slink freebase/en/fedora" title="Fedora" rel="homepage" href="http://fedoraproject.org/">Fedora 12, fedora is using plymouth. Plymouth kicks in just after grub and before the Xserver starts.

Description:

Plymouth provides an attractive graphical <a class="zem_slink freebase/en/bootsplash" title="Bootsplash" rel="wikipedia" href="http://en.wikipedia.org/wiki/Bootsplash">boot animation in
place of the <a class="zem_slink freebase/en/text_messaging" title="Text messaging" rel="wikipedia" href="http://en.wikipedia.org/wiki/Text_messaging">text messages that normally get shown.  Text
messages are instead redirected to a <a class="zem_slink freebase/en/data_logger" title="Data logger" rel="wikipedia" href="http://en.wikipedia.org/wiki/Data_logger">log file for viewing
after boot.

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Display the history and optionally grep

2010-05-19 1 min read Bash

Ever wondered how good it would be to have a command/function that would display the history or display the history with <a class="zem_slink" title="Grep" rel="wikipedia" href="http://en.wikipedia.org/wiki/Grep">grep.

Would be really good right, well someone thought about this 🙂

$ h() { if [ -z &#8221;$1&#8221; ]; then history; else history | grep &#8221;$@&#8221;; fi; }

Place this in your .bash_profile and you can use it two different ways. If you issue &#8217;h&#8217; on its own, then it acts like the history command. If you issue:

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