Let's suppose you need to send a file to multiple hosts and you can not do it manually and you need to do it now. Below I talk you through three strategies you can use to send files in emergencies. SCP + EXPECT From the server send the file to each host using and to avoid entering the password many times SCP expect USER= PASS= DEST_PATH= list= i ; VAR=$(expect -c ) #!/bin/bash "user" "passwd" "/home/user" "192.168.0.1 
192.168.0.2
192.168.0.3
192.168.0.4
192.168.0.5
192.168.0.6
" for in $list do "
 spawn scp -oStrictHostKeyChecking=no -oCheckHostIP=no file.txt @ : match_max 100000
 expect \"*?assword:*\"
 send -- \" \r\"
 send -- \"\r\"
 expect eof
 " $USER $i $DEST_PATH $PASS echo " " $VAR #to see remote command answer done rsycn + EXPECT From each host download the file from the server using and to avoid entering the password many times rsync expect USER= PASS= DEST_PATH= list= i ; VAR=$(expect -c ) #!/bin/bash "user" "passwd" "/home/user" "192.168.0.1 
192.168.0.2
192.168.0.3
192.168.0.4
192.168.0.5
192.168.0.6
" for in $list do "
 spawn rsync -e \"ssh -o StrictHostKeyChecking=no\" file.txt @ : match_max 100000
 expect \"*?assword:*\"
 send -- \" \r\"
 send -- \"\r\"
 expect eof
 " $USER $i $DEST_PATH $PASS echo " " $VAR done Parallel-scp Use the command to sent the file from the  server to each host (hosts list on the ips.txt file one per line) parallel-scp parallel-scp --askpass -lremote_host_user -h ips.txt  file.txt /remote/host/dest/path "-O StrictHostKeyChecking=no" Bonus Tip If you lose ssh connection to a server but you still have session active this trick could help you. ;) Generate the file base64 file_to_copy > file_to_recover base64 directory_to_copy.tar.gz > file_to_recover tar cfz - $(rpm -ql ssh) | base64 > file_to_recover #For files #For directories #For RPMs Then copy the content of the file_to_recover in the host and recover it with these commands base64 -d file_to_recover base64 -d file_to_recover | tar xfz base64 -d < file_to_recover | tar xfz - #For files #For directories #For RPM

3 Strategies to Send Files to Multiple Linux Hosts in Emergencies

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