Fix head: illegal line count -- -1 (#443)

* Fix head: illegal line count -- -1

* Fix `osascript: display notification with title "📧 xxxx" subtitle "xxxx" : No such file or directory`

bin/mailsync

@@ -21,7 +21,7 @@ export DISPLAY=:0.0
 # Settings are different for MacOS (Darwin) systems.
 if [ "$(uname)" = "Darwin" ]; then
     notify() { osascript -e "display notification \"$2 in $1\" with title \"You've got Mail\" subtitle \"Account: $account\"" && sleep 2 ;}
-    messageinfo() { osascript "display notification with title \"📧 $from\" subtitle \"$subject\"" ;}
+    messageinfo() { osascript -e "display notification with title \"📧 $from\" subtitle \"$subject\"" ;}
 else
     notify() { notify-send --app-name="mutt-wizard" "mutt-wizard" "📬 $2 new mail(s) in \`$1\` account." ;}
     messageinfo() { notify-send --app-name="mutt-wizard" "📧$from:" "$subject" ;}
@@ -38,7 +38,7 @@ syncandnotify() {
         for file in $new; do
             # Extract subject and sender from mail.
             from=$(awk '/^From: / && ++n ==1,/^\<.*\>:/' "$file" | perl -CS -MEncode -ne 'print decode("MIME-Header", $_)' | awk '{ $1=""; if (NF>=3)$NF=""; print $0 }' | sed 's/^[[:blank:]]*[\"'\''\<]*//;s/[\"'\''\>]*[[:blank:]]*$//')
-            subject=$(awk '/^Subject: / && ++n == 1,/^\<.*\>: / && ++i == 2' "$file" | head -n-1 | perl -CS -MEncode -ne 'print decode("MIME-Header", $_)' | sed 's/^Subject: //' | sed 's/^{[[:blank:]]*[\"'\''\<]*//;s/[\"'\''\>]*[[:blank:]]*$//' | tr -d '\n')
+            subject=$(awk '/^Subject: / && ++n == 1,/^\<.*\>: / && ++i == 2' "$file" | head -n 1 | perl -CS -MEncode -ne 'print decode("MIME-Header", $_)' | sed 's/^Subject: //' | sed 's/^{[[:blank:]]*[\"'\''\<]*//;s/[\"'\''\>]*[[:blank:]]*$//' | tr -d '\n')
 	    messageinfo &
         done
     fi