examples: format and run shellcheck

~~~
shfmt -i 2 -ci -w examples
shellcheck examples/*
~~~

examples/bot.sh

@@ -17,11 +17,11 @@ TMPDIR=$(mktemp -d)
 in="$TMPDIR/stdin"
 out="$TMPDIR/stdout"
 
-mkfifo $in
-mkfifo $out
+mkfifo "$in"
+mkfifo "$out"
 
 cleanup() {
-    rm -rf $TMPDIR
+  rm -rf "$TMPDIR"
 }
 
 decode() {
@@ -33,15 +33,16 @@ bot() {
   while IFS=: read stanza type from to body; do
     case "$stanza" in
       m) ;;
-            p) decode "$stanza:$type:$from:$to" 1>&2
+      p)
+        decode "$stanza:$type:$from:$to" 1>&2
         echo 1>&2
         continue
         ;;
       *) continue ;;
     esac
 
-        USER="$(decode ${from#*/})"
-        MSG="$(decode ${body})"
+    USER="$(decode "${from#*/}")"
+    MSG="$(decode "$body")"
 
     case $MSG in
       *"has set the subject to:"*) ;;
@@ -72,8 +73,8 @@ bot() {
         fi
         ;;
     esac
-    done < $out
+  done <"$out"
 }
 
-bot > $in &
-xmppipe "$@" <$in >$out
+bot >"$in" &
+xmppipe "$@" <"$in" >"$out"

examples/ssh-over-xmpp

@@ -25,10 +25,11 @@ TMPDIR=$(mktemp -d)
 out=$TMPDIR/out
 
 atexit() {
-    rm -rf $TMPDIR
+  rm -rf "$TMPDIR"
 }
 
 decode() {
+  # shellcheck disable=SC2034
   while IFS=: read stanza type from to body; do
     case "$stanza" in
       m) printf '%b' "${body//%/\\x}" ;;
@@ -39,12 +40,13 @@ decode() {
 
 server() {
   CONNECT=0
-    xmppipe -e -r server -o $1 -b 1024 -x < /dev/null | \
+  xmppipe -e -r server -o "$1" -b 1024 -x </dev/null |
     while IFS=: read stanza rest; do
       case "$stanza" in
         p)
           CONNECT=$((CONNECT + 1))
           if [ "$CONNECT" -gt "1" ]; then
+            # shellcheck disable=SC2068
             exec "$PROGNAME" session $@
           fi
           ;;
@@ -54,16 +56,19 @@ server() {
 }
 
 session() {
-    mkdir -p $TMPDIR
+  mkdir -p "$TMPDIR"
   trap atexit 0
 
-    mkfifo $out
+  mkfifo "$out"
 
-    nc $2 $3 < $out | xmppipe -P 100 -r session -o $1 -x -s | decode > $out
+  nc "$2" "$3" <"$out" |
+    xmppipe -P 100 -r session -o "$1" -x -s |
+    decode >"$out"
 }
 
 client() {
-    xmppipe -P 100 -r client -o $1 -x -s | decode
+  xmppipe -P 100 -r client -o "$1" -x -s | decode
 }
 
+# shellcheck disable=SC2068
 $@