find /DIR -name "*.txt" | xargs rm

if test "$1" 
	then
        
        cd "$1";

        ТУТ ЦИКЛ, в котором мы идем по всем файлам

            if  имя файла == *.txt
        	rm его (удаляем его)
            fi

        КОНЕЦ ЦИКЛА
        
    else
  		echo Usage: noparam
fi

#include <iostream>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>

using namespace std;

int main()
{
    DIR* dir;
    struct  dirent* entry;
    struct stat st;
    char *cur_ent;
    char find_elem[100][20];
    char *last;
    char *end;


    strcpy(end,"home");
    strcpy(last, "OS3cpp"); // OS3cpp - название проги

    while(last!=end) {
        strcat(cur_ent,"//");
        printf("%s", last);
        strcat(cur_ent, last);
        chdir("..");
        dir = opendir(".");
        int i = 0;
        while ((entry = readdir(dir))!=NULL) {
            if(strcmp(entry->d_name, ".") == 0 && strcmp(entry->d_name, "..") == 0){
                stat(entry->d_name,&st);
                    if(S_ISDIR(st.st_mode)) {
                        strcpy(find_elem[i++], entry->d_name);
                    }
            }
        }

        int t = 0;
        while(t == 0) {
            i++;
            chdir(find_elem[i]);
            dir = opendir(".");
            while((entry = readdir(dir))!=NULL) {
                if(entry->d_name == last) {
                    chdir("..");
                    strcat(last,find_elem[i]);
                    t=1;
                } else chdir("..");
                t=1;
            }
        }
    }
    return 0;
}

num1=`cd $1 && find * -maxdepth 0 -type f | wc -w`

 flg=0
 for ((i=1; i<$num1; i++)) do
    flg=0
    for ((j=1; j<$num2; j++)) do
      if [ "$i" -ne "$j" ]
        then if [ "$массив1[$i]" = "$массив2[$j]" ] then flg = 1 fi
      fi
    done
    if [ $flg != "1" ] then echo $массив1[$i] fi
 done

Написать командную процедуру, которая создает каталог для резервного копирования файлов.
Имена каталога и файлов указываются в виде аргументов.

#!/bin/bash
mkdir $1 && 
cd $1 && 
tar -czf $1-`date +%F--%H-%M`.tar.gz $2

$id = $row['id'];

'screen -dmS server_'.$id.' sudo -u s'.$id.' java -Xincgc -Xmx1000m -Xms100m -jar craftbukkit.jar nogui;';

Error: Could not find or load main class org.bukkit.craftbukkit.Main

Sat Jun 14 21:48:10 2014 OpenVPN 2.3.4 x86_64-w64-mingw32 [SSL (OpenSSL)] [LZO] [PKCS11] [IPv6] built on Jun  5 2014
Sat Jun 14 21:48:10 2014 library versions: OpenSSL 1.0.1h 5 Jun 2014, LZO 2.05
Sat Jun 14 21:48:10 2014 MANAGEMENT: TCP Socket listening on [AF_INET]127.0.0.1:25340
Sat Jun 14 21:48:10 2014 Need hold release from management interface, waiting...
Sat Jun 14 21:48:11 2014 MANAGEMENT: Client connected from [AF_INET]127.0.0.1:25340
Sat Jun 14 21:48:11 2014 MANAGEMENT: CMD 'state on'
Sat Jun 14 21:48:11 2014 MANAGEMENT: CMD 'log all on'
Sat Jun 14 21:48:11 2014 MANAGEMENT: CMD 'hold off'
Sat Jun 14 21:48:11 2014 MANAGEMENT: CMD 'hold release'
Sat Jun 14 21:48:11 2014 Socket Buffers: R=[8192->8192] S=[8192->8192]
Sat Jun 14 21:48:11 2014 Attempting to establish TCP connection with [AF_INET]180.120.253.239:1194
Sat Jun 14 21:48:11 2014 MANAGEMENT: >STATE:1402768091,TCP_CONNECT,,,
Sat Jun 14 21:48:32 2014 TCP: connect to [AF_INET]180.120.253.239:1194 failed, will try again in 5 seconds: Connection timed out (WSAETIMEDOUT)
Sat Jun 14 21:48:37 2014 MANAGEMENT: >STATE:1402768117,TCP_CONNECT,,,

#Порт для подключения, стандартный 1194, но вы можете выбрать тот который больше нравится
port 1194
#Тип соединения TCP или UDP
proto tcp
#Тин тоннеля
dev tun 
#Список сертификатов
ca ca.crt
cert server.crt
key server.key
dh dh1024.pem
# При подключении мы будем попадать в эту сеть
server 192.168.100.0 255.255.255.0
#Сохраняем выдаенные адреса клиентов в файл
ifconfig-pool-persist ipp.txt
#Проверяем состояние канала
keepalive 20 120 
#использовать сжатие
comp-lzo 
persist-key
persist-tun
#включаем логирование 
status openvpn-status.log 
#уровень логирования 
verb 3
#Определяем наш OpenVPN сервер в качестве шлюза по умолчанию
push "redirect-gateway" 
#Разрешаем соединения между клиентами
client-to-client
#добавляем маршруты
route 192.168.100.0 255.255.255.0
#Указываем DNS сервер
push "dhcp-option 8.8.8.8"

##############################################
# Sample client-side OpenVPN 2.0 config file #
# for connecting to multi-client server.     #
#                                            #
# This configuration can be used by multiple #
# clients, however each client should have   #
# its own cert and key files.                #
#                                            #
# On Windows, you might want to rename this  #
# file so it has a .ovpn extension           #
##############################################

# Specify that we are a client and that we
# will be pulling certain config file directives
# from the server.
client

# Use the same setting as you are using on
# the server.
# On most systems, the VPN will not function
# unless you partially or fully disable
# the firewall for the TUN/TAP interface.
;dev tap
dev tun

# Windows needs the TAP-Win32 adapter name
# from the Network Connections panel
# if you have more than one.  On XP SP2,
# you may need to disable the firewall
# for the TAP adapter.
;dev-node MyTap

# Are we connecting to a TCP or
# UDP server?  Use the same setting as
# on the server.
proto tcp
;proto udp

# The hostname/IP and port of the server.
# You can have multiple remote entries
# to load balance between the servers.
remote 180.120.253.239 1194
;remote my-server-2 1194

# Choose a random host from the remote
# list for load-balancing.  Otherwise
# try hosts in the order specified.
;remote-random

# Keep trying indefinitely to resolve the
# host name of the OpenVPN server.  Very useful
# on machines which are not permanently connected
# to the internet such as laptops.
resolv-retry infinite

# Most clients don't need to bind to
# a specific local port number.
nobind

# Downgrade privileges after initialization (non-Windows only)
;user nobody
;group nobody

# Try to preserve some state across restarts.
persist-key
persist-tun

# If you are connecting through an
# HTTP proxy to reach the actual OpenVPN
# server, put the proxy server/IP and
# port number here.  See the man page
# if your proxy server requires
# authentication.
;http-proxy-retry # retry on connection failures
;http-proxy [proxy server] [proxy port #]

# Wireless networks often produce a lot
# of duplicate packets.  Set this flag
# to silence duplicate packet warnings.
;mute-replay-warnings

# SSL/TLS parms.
# See the server config file for more
# description.  It's best to use
# a separate .crt/.key file pair
# for each client.  A single ca
# file can be used for all clients.
ca ca.crt
cert ice.crt
key ice.key

# Verify server certificate by checking
# that the certicate has the nsCertType
# field set to "server".  This is an
# important precaution to protect against
# a potential attack discussed here:
#  http://openvpn.net/howto.html#mitm
#
# To use this feature, you will need to generate
# your server certificates with the nsCertType
# field set to "server".  The build-key-server
# script in the easy-rsa folder will do this.
ns-cert-type server

# If a tls-auth key is used on the server
# then every client must also have the key.
;tls-auth ta.key 1

# Select a cryptographic cipher.
# If the cipher option is used on the server
# then you must also specify it here.
;cipher x

# Enable compression on the VPN link.
# Don't enable this unless it is also
# enabled in the server config file.
comp-lzo

# Set log file verbosity.
verb 3

# Silence repeating messages
;mute 20