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@sungmin-park
Created January 19, 2012 10:49
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#!/bin/sh
# Shell script to install your public key on a remote machine
# Takes the remote machine name as an argument.
# Obviously, the remote machine must accept password authentication,
# or one of the other keys in your ssh-agent, for this to work.
#
# http://www.devthought.com/2009/09/19/get-ssh-copy-id-in-mac-os-x/
#
ID_FILE="${HOME}/.ssh/id_rsa.pub"
if [ "-i" = "$1" ]; then
shift
# check if we have 2 parameters left, if so the first is the new ID file
if [ -n "$2" ]; then
if expr "$1" : ".*\.pub" > /dev/null ; then
ID_FILE="$1"
else
ID_FILE="$1.pub"
fi
shift # and this should leave $1 as the target name
fi
else
if [ x$SSH_AUTH_SOCK != x ] && ssh-add -L >/dev/null 2>&1; then
GET_ID="$GET_ID ssh-add -L"
fi
fi
if [ -z "`eval $GET_ID`" ] && [ -r "${ID_FILE}" ] ; then
GET_ID="cat ${ID_FILE}"
fi
if [ -z "`eval $GET_ID`" ]; then
echo "$0: ERROR: No identities found" >&2
exit 1
fi
if [ "$#" -lt 1 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
echo "Usage: $0 [-i [identity_file]] [user@]machine" >&2
exit 1
fi
# strip any trailing colon
host=`echo $1 | sed 's/:$//'`
{ eval "$GET_ID" ; } | ssh $host "umask 077; test -d ~/.ssh || mkdir ~/.ssh ; cat >> ~/.ssh/authorized_keys" || exit 1
cat <<EOF
Now try logging into the machine, with "ssh '$host'", and check in:
~/.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
EOF
@sungmin-park
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brew install ssh-copy-id
or
port install openssh

@StevenACoffman
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This will fail with an "Ambiguous Output" error for hosts where the shell is not defaulting to bash. For instance, csh.
See here for more on the problem and the fix

{ eval "$GET_ID" ; } | ssh $host "exec sh -c 'umask 077; test -d ~/.ssh || mkdir ~/.ssh ; cat >> .ssh/authorized_keys'"

@StevenACoffman
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ssh $host "exec sh -c 'umask 077; test -d ~/.ssh || mkdir ~/.ssh ; cat >> .ssh/authorized_keys'"

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