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perl -i.old -lne 'if (/^[\s#]*Port/i) { print "Port 1234" unless $done
+++ } else { print }' sshd_config

perl -i.old -lne 'print unless /^[\s#]*Port/i; END{print "Port 1234"}'
+ sshd_config

PORT=1234 perl -i.old -lne 'print unless /^[\s#]*Port/i; END { print "
+Port $ENV{PORT}" }' sshd_config

perl -i.old -lne 'BEGIN { $sshport = pop }; print unless /^[\s#]*Port/
+i; END { print "Port $sshport" }' sshd_config 1234