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newt: add !cmd

--- a/rc/bin/newt

+++ b/rc/bin/newt

@@ -122,6 +122,7 @@

 "		print message in quoted form, suitable for reply

 |cmd		pipe message body to a command

 ||cmd		pipe raw message to a command

+!cmd		run a command

 ?		print debug information'

 }

 fn np{

@@ -294,6 +295,8 @@

 	case '|'*

 		cmd=`{echo $"cmd | sed 's/^\|//g'}

 		cat $mnt/$group/^$rposts($post)^/body | eval $cmd

+	case '!'*

+		eval `{echo $"cmd | sed 's/^\!//g'}

 	case '?'

 		echo editor: $editor

 		echo pager: $pager

--- a/sys/man/1/newt

+++ b/sys/man/1/newt

@@ -140,6 +140,9 @@

 .I command

 with the whole message as standard input.

 .TP

+.BI ! command

+Escape to the shell to do command.

+.TP

 \fB"\fP

 Print the current message in quoted form, suitable for reply.

 .PP