bash remote ssh update append replace












2















I can successfully ssh into a remote Linux/Ubuntu machine located on a remote LAN from another Linux/Ubuntu machine located on my local LAN and I can also append the file that I want on the remote machine with my new data using example:



RET_IP="111.111.111.111"

HOSTNAME=system host name

PORT="111"

DEST_FILE="/etc/hosts_2"

echo "$RET_IP     $HOSTNAME" | ssh -p  $PORT root@hostname "cat >> $DEST_FILE"


The file contents represent an /etc/hosts file. What I can't figure out what to do is how to replace the line for the IP hostname. There may be several entries to the hosts_2 file and even some entries with the same IP address, just different hostname and I want to locate the line with hostname"X" and replace it or if that hostname"X" doesn't exist, I want to add/append the hosts_2 file with the new line.



I do not know if this is possible remotely. Maybe it is not possible remotely. My searches have not found what I need although maybe there is something with sed.






bash ssh replace append







share|improve this question



























    2















    I can successfully ssh into a remote Linux/Ubuntu machine located on a remote LAN from another Linux/Ubuntu machine located on my local LAN and I can also append the file that I want on the remote machine with my new data using example:



    RET_IP="111.111.111.111"
    
HOSTNAME=system host name
    
PORT="111"
    
DEST_FILE="/etc/hosts_2"
    
echo "$RET_IP     $HOSTNAME" | ssh -p  $PORT root@hostname "cat >> $DEST_FILE"


    The file contents represent an /etc/hosts file. What I can't figure out what to do is how to replace the line for the IP hostname. There may be several entries to the hosts_2 file and even some entries with the same IP address, just different hostname and I want to locate the line with hostname"X" and replace it or if that hostname"X" doesn't exist, I want to add/append the hosts_2 file with the new line.



    I do not know if this is possible remotely. Maybe it is not possible remotely. My searches have not found what I need although maybe there is something with sed.






    bash ssh replace append







    share|improve this question

























      2












      2








      2








      I can successfully ssh into a remote Linux/Ubuntu machine located on a remote LAN from another Linux/Ubuntu machine located on my local LAN and I can also append the file that I want on the remote machine with my new data using example:



      RET_IP="111.111.111.111"
      
HOSTNAME=system host name
      
PORT="111"
      
DEST_FILE="/etc/hosts_2"
      
echo "$RET_IP     $HOSTNAME" | ssh -p  $PORT root@hostname "cat >> $DEST_FILE"


      The file contents represent an /etc/hosts file. What I can't figure out what to do is how to replace the line for the IP hostname. There may be several entries to the hosts_2 file and even some entries with the same IP address, just different hostname and I want to locate the line with hostname"X" and replace it or if that hostname"X" doesn't exist, I want to add/append the hosts_2 file with the new line.



      I do not know if this is possible remotely. Maybe it is not possible remotely. My searches have not found what I need although maybe there is something with sed.






      bash ssh replace append







      share|improve this question














      I can successfully ssh into a remote Linux/Ubuntu machine located on a remote LAN from another Linux/Ubuntu machine located on my local LAN and I can also append the file that I want on the remote machine with my new data using example:



      RET_IP="111.111.111.111"
      
HOSTNAME=system host name
      
PORT="111"
      
DEST_FILE="/etc/hosts_2"
      
echo "$RET_IP     $HOSTNAME" | ssh -p  $PORT root@hostname "cat >> $DEST_FILE"


      The file contents represent an /etc/hosts file. What I can't figure out what to do is how to replace the line for the IP hostname. There may be several entries to the hosts_2 file and even some entries with the same IP address, just different hostname and I want to locate the line with hostname"X" and replace it or if that hostname"X" doesn't exist, I want to add/append the hosts_2 file with the new line.



      I do not know if this is possible remotely. Maybe it is not possible remotely. My searches have not found what I need although maybe there is something with sed.






      bash ssh replace append




      bash ssh replace append






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 23 '18 at 19:51









      WesZWesZ

      527




      527
























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          IP="111.111.111.111"
          
ssh_system_hostname="whatever"
          
new_hostname="system host name"
          
old_hostname="X"
          
port="111"
          
dest_file="/etc/hosts_2"
          
ssh -p $port root@$ssh_system_hostname -i "grep "$IP     $old_hostname" $dest_file
          
    && sed -ie "s:$IP     $old_hostname:$IP     $new_hostname:g" $dest_file
          
    || echo "$IP     $new_hostname" >> $dest_file"


          Lemme know if this works. I'm not entirely sure I escaped my double quotes correctly.



          Explanation: you ssh as normal, and then you check if the line exists in the file with grep. If that succeeds, you do a substitute with sed for the old thing and replace it with the new thing in that file. If the grep fails (or if the grep succeeds and somehow the sed fails), then append to the file with echo.








          share|improve this answer
























          • Hi Jeremy, I gave it code TEST_IP="111.111.111.111" TEST_HOSTNAME="$HOSTNAME" port="222" IP="222.222.222.222" old_hostname="nanoPCT4" new_hostname="nanoPCT4" dest_file="etc/hosts_2" $new_hostname="Test_Host" and ssh -p $port root@${dUSER[${x}]} -i "grep "$TEST_IP $old_hostname" $dest_file && sed -ie "s:$TEST_IP $old_hostname:$IP $new_hostname:g" $dest_file || echo "$IP $new_hostname" >> $dest_file" and it ssh's fine but returns this:

            – WesZ
            Nov 24 '18 at 9:23













          • nanoPCT4=Test_Host: command not found Warning: Identity file grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:111.111.111.111 nanoPCT4:222.222.222.222 nanoPCT4:g" /etc/hosts_2 || echo "222.222.222.222 nanoPCT4" >> /etc/hosts_2 not accessible: No such file or directory.

            – WesZ
            Nov 24 '18 at 9:28













          • Both of these work from the command line: echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2

            – WesZ
            Nov 24 '18 at 9:59











          • This also worked fine from the command line. grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2

            – WesZ
            Nov 24 '18 at 10:07











          • I was able to log in remotely using the -ssh credentials and successfully execute grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 from the command line. I just can't do it all at the same time.

            – WesZ
            Nov 24 '18 at 10:31











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          IP="111.111.111.111"
          
ssh_system_hostname="whatever"
          
new_hostname="system host name"
          
old_hostname="X"
          
port="111"
          
dest_file="/etc/hosts_2"
          
ssh -p $port root@$ssh_system_hostname -i "grep "$IP     $old_hostname" $dest_file
          
    && sed -ie "s:$IP     $old_hostname:$IP     $new_hostname:g" $dest_file
          
    || echo "$IP     $new_hostname" >> $dest_file"


          Lemme know if this works. I'm not entirely sure I escaped my double quotes correctly.



          Explanation: you ssh as normal, and then you check if the line exists in the file with grep. If that succeeds, you do a substitute with sed for the old thing and replace it with the new thing in that file. If the grep fails (or if the grep succeeds and somehow the sed fails), then append to the file with echo.








          share|improve this answer
























          • Hi Jeremy, I gave it code TEST_IP="111.111.111.111" TEST_HOSTNAME="$HOSTNAME" port="222" IP="222.222.222.222" old_hostname="nanoPCT4" new_hostname="nanoPCT4" dest_file="etc/hosts_2" $new_hostname="Test_Host" and ssh -p $port root@${dUSER[${x}]} -i "grep "$TEST_IP $old_hostname" $dest_file && sed -ie "s:$TEST_IP $old_hostname:$IP $new_hostname:g" $dest_file || echo "$IP $new_hostname" >> $dest_file" and it ssh's fine but returns this:

            – WesZ
            Nov 24 '18 at 9:23













          • nanoPCT4=Test_Host: command not found Warning: Identity file grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:111.111.111.111 nanoPCT4:222.222.222.222 nanoPCT4:g" /etc/hosts_2 || echo "222.222.222.222 nanoPCT4" >> /etc/hosts_2 not accessible: No such file or directory.

            – WesZ
            Nov 24 '18 at 9:28













          • Both of these work from the command line: echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2

            – WesZ
            Nov 24 '18 at 9:59











          • This also worked fine from the command line. grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2

            – WesZ
            Nov 24 '18 at 10:07











          • I was able to log in remotely using the -ssh credentials and successfully execute grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 from the command line. I just can't do it all at the same time.

            – WesZ
            Nov 24 '18 at 10:31
















          1














          IP="111.111.111.111"
          
ssh_system_hostname="whatever"
          
new_hostname="system host name"
          
old_hostname="X"
          
port="111"
          
dest_file="/etc/hosts_2"
          
ssh -p $port root@$ssh_system_hostname -i "grep "$IP     $old_hostname" $dest_file
          
    && sed -ie "s:$IP     $old_hostname:$IP     $new_hostname:g" $dest_file
          
    || echo "$IP     $new_hostname" >> $dest_file"


          Lemme know if this works. I'm not entirely sure I escaped my double quotes correctly.



          Explanation: you ssh as normal, and then you check if the line exists in the file with grep. If that succeeds, you do a substitute with sed for the old thing and replace it with the new thing in that file. If the grep fails (or if the grep succeeds and somehow the sed fails), then append to the file with echo.








          share|improve this answer
























          • Hi Jeremy, I gave it code TEST_IP="111.111.111.111" TEST_HOSTNAME="$HOSTNAME" port="222" IP="222.222.222.222" old_hostname="nanoPCT4" new_hostname="nanoPCT4" dest_file="etc/hosts_2" $new_hostname="Test_Host" and ssh -p $port root@${dUSER[${x}]} -i "grep "$TEST_IP $old_hostname" $dest_file && sed -ie "s:$TEST_IP $old_hostname:$IP $new_hostname:g" $dest_file || echo "$IP $new_hostname" >> $dest_file" and it ssh's fine but returns this:

            – WesZ
            Nov 24 '18 at 9:23













          • nanoPCT4=Test_Host: command not found Warning: Identity file grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:111.111.111.111 nanoPCT4:222.222.222.222 nanoPCT4:g" /etc/hosts_2 || echo "222.222.222.222 nanoPCT4" >> /etc/hosts_2 not accessible: No such file or directory.

            – WesZ
            Nov 24 '18 at 9:28













          • Both of these work from the command line: echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2

            – WesZ
            Nov 24 '18 at 9:59











          • This also worked fine from the command line. grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2

            – WesZ
            Nov 24 '18 at 10:07











          • I was able to log in remotely using the -ssh credentials and successfully execute grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 from the command line. I just can't do it all at the same time.

            – WesZ
            Nov 24 '18 at 10:31














          1












          1








          1







          IP="111.111.111.111"
          
ssh_system_hostname="whatever"
          
new_hostname="system host name"
          
old_hostname="X"
          
port="111"
          
dest_file="/etc/hosts_2"
          
ssh -p $port root@$ssh_system_hostname -i "grep "$IP     $old_hostname" $dest_file
          
    && sed -ie "s:$IP     $old_hostname:$IP     $new_hostname:g" $dest_file
          
    || echo "$IP     $new_hostname" >> $dest_file"


          Lemme know if this works. I'm not entirely sure I escaped my double quotes correctly.



          Explanation: you ssh as normal, and then you check if the line exists in the file with grep. If that succeeds, you do a substitute with sed for the old thing and replace it with the new thing in that file. If the grep fails (or if the grep succeeds and somehow the sed fails), then append to the file with echo.








          share|improve this answer













          IP="111.111.111.111"
          
ssh_system_hostname="whatever"
          
new_hostname="system host name"
          
old_hostname="X"
          
port="111"
          
dest_file="/etc/hosts_2"
          
ssh -p $port root@$ssh_system_hostname -i "grep "$IP     $old_hostname" $dest_file
          
    && sed -ie "s:$IP     $old_hostname:$IP     $new_hostname:g" $dest_file
          
    || echo "$IP     $new_hostname" >> $dest_file"


          Lemme know if this works. I'm not entirely sure I escaped my double quotes correctly.



          Explanation: you ssh as normal, and then you check if the line exists in the file with grep. If that succeeds, you do a substitute with sed for the old thing and replace it with the new thing in that file. If the grep fails (or if the grep succeeds and somehow the sed fails), then append to the file with echo.









          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 24 '18 at 1:16









          jeremysprofilejeremysprofile

          1,7751817




          1,7751817













          • Hi Jeremy, I gave it code TEST_IP="111.111.111.111" TEST_HOSTNAME="$HOSTNAME" port="222" IP="222.222.222.222" old_hostname="nanoPCT4" new_hostname="nanoPCT4" dest_file="etc/hosts_2" $new_hostname="Test_Host" and ssh -p $port root@${dUSER[${x}]} -i "grep "$TEST_IP $old_hostname" $dest_file && sed -ie "s:$TEST_IP $old_hostname:$IP $new_hostname:g" $dest_file || echo "$IP $new_hostname" >> $dest_file" and it ssh's fine but returns this:

            – WesZ
            Nov 24 '18 at 9:23













          • nanoPCT4=Test_Host: command not found Warning: Identity file grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:111.111.111.111 nanoPCT4:222.222.222.222 nanoPCT4:g" /etc/hosts_2 || echo "222.222.222.222 nanoPCT4" >> /etc/hosts_2 not accessible: No such file or directory.

            – WesZ
            Nov 24 '18 at 9:28













          • Both of these work from the command line: echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2

            – WesZ
            Nov 24 '18 at 9:59











          • This also worked fine from the command line. grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2

            – WesZ
            Nov 24 '18 at 10:07











          • I was able to log in remotely using the -ssh credentials and successfully execute grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 from the command line. I just can't do it all at the same time.

            – WesZ
            Nov 24 '18 at 10:31



















          • Hi Jeremy, I gave it code TEST_IP="111.111.111.111" TEST_HOSTNAME="$HOSTNAME" port="222" IP="222.222.222.222" old_hostname="nanoPCT4" new_hostname="nanoPCT4" dest_file="etc/hosts_2" $new_hostname="Test_Host" and ssh -p $port root@${dUSER[${x}]} -i "grep "$TEST_IP $old_hostname" $dest_file && sed -ie "s:$TEST_IP $old_hostname:$IP $new_hostname:g" $dest_file || echo "$IP $new_hostname" >> $dest_file" and it ssh's fine but returns this:

            – WesZ
            Nov 24 '18 at 9:23













          • nanoPCT4=Test_Host: command not found Warning: Identity file grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:111.111.111.111 nanoPCT4:222.222.222.222 nanoPCT4:g" /etc/hosts_2 || echo "222.222.222.222 nanoPCT4" >> /etc/hosts_2 not accessible: No such file or directory.

            – WesZ
            Nov 24 '18 at 9:28













          • Both of these work from the command line: echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2

            – WesZ
            Nov 24 '18 at 9:59











          • This also worked fine from the command line. grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2

            – WesZ
            Nov 24 '18 at 10:07











          • I was able to log in remotely using the -ssh credentials and successfully execute grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 from the command line. I just can't do it all at the same time.

            – WesZ
            Nov 24 '18 at 10:31

















          Hi Jeremy, I gave it code TEST_IP="111.111.111.111" TEST_HOSTNAME="$HOSTNAME" port="222" IP="222.222.222.222" old_hostname="nanoPCT4" new_hostname="nanoPCT4" dest_file="etc/hosts_2" $new_hostname="Test_Host" and ssh -p $port root@${dUSER[${x}]} -i "grep "$TEST_IP $old_hostname" $dest_file && sed -ie "s:$TEST_IP $old_hostname:$IP $new_hostname:g" $dest_file || echo "$IP $new_hostname" >> $dest_file" and it ssh's fine but returns this:

          – WesZ
          Nov 24 '18 at 9:23







          Hi Jeremy, I gave it code TEST_IP="111.111.111.111" TEST_HOSTNAME="$HOSTNAME" port="222" IP="222.222.222.222" old_hostname="nanoPCT4" new_hostname="nanoPCT4" dest_file="etc/hosts_2" $new_hostname="Test_Host" and ssh -p $port root@${dUSER[${x}]} -i "grep "$TEST_IP $old_hostname" $dest_file && sed -ie "s:$TEST_IP $old_hostname:$IP $new_hostname:g" $dest_file || echo "$IP $new_hostname" >> $dest_file" and it ssh's fine but returns this:

          – WesZ
          Nov 24 '18 at 9:23















          nanoPCT4=Test_Host: command not found Warning: Identity file grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:111.111.111.111 nanoPCT4:222.222.222.222 nanoPCT4:g" /etc/hosts_2 || echo "222.222.222.222 nanoPCT4" >> /etc/hosts_2 not accessible: No such file or directory.

          – WesZ
          Nov 24 '18 at 9:28







          nanoPCT4=Test_Host: command not found Warning: Identity file grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:111.111.111.111 nanoPCT4:222.222.222.222 nanoPCT4:g" /etc/hosts_2 || echo "222.222.222.222 nanoPCT4" >> /etc/hosts_2 not accessible: No such file or directory.

          – WesZ
          Nov 24 '18 at 9:28















          Both of these work from the command line: echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2

          – WesZ
          Nov 24 '18 at 9:59





          Both of these work from the command line: echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2

          – WesZ
          Nov 24 '18 at 9:59













          This also worked fine from the command line. grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2

          – WesZ
          Nov 24 '18 at 10:07





          This also worked fine from the command line. grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2

          – WesZ
          Nov 24 '18 at 10:07













          I was able to log in remotely using the -ssh credentials and successfully execute grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 from the command line. I just can't do it all at the same time.

          – WesZ
          Nov 24 '18 at 10:31





          I was able to log in remotely using the -ssh credentials and successfully execute grep "111.111.111.111 nanoPCT4" /etc/hosts_2 && sed -ie "s:333.333.333.333 nanoPCT4:444.444.444.444 nanoPCT4:g" /etc/hosts_2 || echo "333.333.333.333 nanoPCT4" >> /etc/hosts_2 from the command line. I just can't do it all at the same time.

          – WesZ
          Nov 24 '18 at 10:31




















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