search for: seen_opt_i

...preventative double-dash ("--"): ssh-copy-id -i ~/.ssh/id_rsa.pub -- remote-server will result in the following error: expr: syntax error: unexpected argument ?[-]i? The error is non-fatal, but it may be confusing to users. I suspect this is caused by line 110: [ "${SEEN_OPT_I}" ] && expr "$1" : "[-]i" >/dev/null && { Here, "$1" is passed to expr without being validated, so if $1 is "--" as shown in the command above, this will confuse expr. I think expr should be called with "--" to prevent this...