Menu driven ssh.

I have quite a lot of servers where I need to ssh at workplace and I generally don\’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 \”Enter the server name:\”
echo \”1. redhat\”
echo \”2. fedora\”

read server

if [ \”$server\” = \”1\” ]; then
ssh amit@redhat
else if [ \”$server\” = \”2\” ]; then
ssh amit@fedora
echo \”Not a valid choice\”

You can download the script ssh_menu.

The power of find command in Linux – advanced.

Generally whoever uses Linux, would know about the find command. Find the man page here.

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

depth — Process each directory\’s contents before the directory itself.
maxdepth — Descend at most levels (a non-negative integer) levels of directories below the command line arguments.
xdev — Don\’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\’s numeric group ID.
nouser — No user corresponds to file\’s numeric user ID.
fls file — True; like -ls but write to file like -fprint.
ok 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 format — True; print format on the standard output, interpreting \’\’ escapes and \’%\’ directives.

There are lot of other options but these are worth mention not used on regular basis. The printf option requires
special mention as the number of options that it supports is quite large and can reallyl help you in the formatting
the data that you get, as well as help you get the data that you want.

1) Get names of files bigger than 5M

find . +5M -printf \”Name : %20f Size : %s\\n\”

2) delete files (filenames contain spaces or quotes and so on)

find . -name \”name*\” -print0 |xargs -0 rm -f

Updated 28th May: Realinged for issues with post going into the sidebar 🙁

Inotify Example: Introduction to Inotify with a C Program Example

Inotify Example: Introduction to Inotify with a C Program Example:

inotify utility is an effective tool to monitor and notify filesystem changes. You can specify a list of files and directories that needs to be monitored by inotify. This library is used by various other programs. For example, CPAN module Linux::Inotify is developed based on this library.
iNotify Execution Flow

On a high-level, you do the following with inotify utility.