There are plenty of SSH autocomplete (or command-line completion) scripts available on the web, but I found most don’t go far enough — they usually just parse the ~/.ssh/known_hosts, ignoring the ~/.ssh/config and /etc/hosts files. Some of these scripts also generate a static autocomplete list at login, and can’t include new hostnames added during the session. The following script uses a function call to autocomplete hostnames dynamically, and fetches hostnames from the ~/.ssh/known_hosts, ~/.ssh/config and system-wide /etc/hosts file.
There are several places to execute an autocomplete script — my personal preference (if you have root access) is a script located in /etc/profile.d/complete-hosts.sh. Most Linux distributions have an /etc/profile that sources additional files under /etc/profile.d/, and in those that don’t (like Mac OS X for example), you can include the following code at the end of your /etc/profile script [credit: CentOS 6.3].
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for i in `ls -1 /etc/profile.d/*.sh` ; do if [ -r "$i" ]; then if [ "${-#*i}" != "$-" ]; then . $i else . $i >/dev/null 2>&1 fi fi done |
An alternative (for those who can’t or won’t modify /etc/profile) might be to include the following complete-hosts.sh script in your ~/.bashrc file instead.
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# /etc/profile.d/complete-hosts.sh # Autocomplete Hostnames for SSH etc. # by Jean-Sebastien Morisset (https://surniaulula.com/) _complete_hosts () { COMPREPLY=() cur="${COMP_WORDS[COMP_CWORD]}" host_list=`{ for c in /etc/ssh_config /etc/ssh/ssh_config ~/.ssh/config do [ -r $c ] && sed -n -e 's/^Host[[:space:]]//p' -e 's/^[[:space:]]*HostName[[:space:]]//p' $c done for k in /etc/ssh_known_hosts /etc/ssh/ssh_known_hosts ~/.ssh/known_hosts do [ -r $k ] && egrep -v '^[#\[]' $k|cut -f 1 -d ' '|sed -e 's/[,:].*//g' done sed -n -e 's/^[0-9][0-9\.]*//p' /etc/hosts; }|tr ' ' '\n'|grep -v '*'` COMPREPLY=( $(compgen -W "${host_list}" -- $cur)) return 0 } complete -F _complete_hosts ssh complete -F _complete_hosts host |