shell_awk_parse_ssh_config – Parse ~/.ssh/config file with awk https://codescreens.com

shell_awk_parse_ssh_config

#!/bin/bash

# http://www.gnu.org/software/bash/manual/bash.html#The-Set-Builtin
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
set -o nounset -o errexit -o pipefail

# Parse ~/.ssh/config file with awk

# usage: shell_awk_parse_ssh_config
# usage: shell_awk_parse_ssh_config | column -t

cat $HOME/.ssh/config | awk -v RS= -v FS=\\n -v IGNORECASE=1 '
    {
        ip = ""
        alias = ""
        id_file = ""
        username = ""

        for (j = 1; j <= NF; ++j) {
            split($j, tmp, " ")
            if (tmp[1] == "Host") { alias = tmp[2] }
            if (tmp[1] == "Hostname") { ip = tmp[2] }
            if (tmp[1] == "IdentityFile") { id_file = substr(tmp[2], 8) }
            if (tmp[1] == "User") { username = tmp[2] }
        }

        if (ip || alias && alias != "*") {
            print ip "\t" alias "\t" username "\t" id_file
        }
    }
'