文件换行输入和清空

cat > /etc/security/limits.conf<< EOF
* soft nproc 16384
* hard nproc 16384
* soft nofile 1048576
* hard nofile 1048576
* soft stack 10240
* hard stack 32768
* hard memlock 8000000
* soft memlock 8000000
EOF

echo -ne "
* soft nofile 65536
* hard nofile 65536
" >>/etc/security/limits.conf

cat /dev/null > /etc/security/limits.conf

cat >> a.txt << EOF
         <ads_cluster1>
             <shard>
              <internal_replication>true</internal_replication>
                     <replica>
                     <default_database>shard1_ads</default_database>
                     <host>10.0.12.14</host>
                     <port>19000</port>
                     <user>default</user>
                     <password>eb22d98eaf028b1ca5c36548193d604a</password>
                     </replica>
                     <replica>
                     <default_database>shard1_ads</default_database>
                     <host>10.0.12.15</host>
                     <port>19000</port>
                     <user>default</user>
                     <password>eb22d98eaf028b1ca5c36548193d604a</password>
                     </replica>
                     <replica>
                     <default_database>shard1_ads</default_database>
                     <host>10.0.12.17</host>
                     <port>19000</port>
                     <user>default</user>
                     <password>eb22d98eaf028b1ca5c36548193d604a</password>
                     </replica>
             </shard>
         </ads_cluster1>
EOF



sed -i '$d' config.xml
cat >> config.xml << EOF
    <distributed_ddl>
        <path>/clickhouse/task_queue/ddl</path>
    </distributed_ddl>
</yandex>
EOF

echo -e '    <distributed_ddl>         <path>/clickhouse/task_queue/ddl</path>     </distributed_ddl> </yandex>' >> config.xml


sed -i '55 r a.txt' metrika.xml
cat -n metrika.xml
sed -i '108,111d' metrika.xml
rm -f a.txt