examples: format and run shellcheck

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

examples/bot.sh

@@ -9,7 +9,7 @@ trap cleanup 0
 BOT_DEBUG=${BOT_DEBUG-""}
 
 if [ "$BOT_DEBUG" ]; then
-set -x
+  set -x
 fi
 
 TMPDIR=$(mktemp -d)
@@ -17,63 +17,64 @@ TMPDIR=$(mktemp -d)
 in="$TMPDIR/stdin"
 out="$TMPDIR/stdout"
 
-mkfifo $in
-mkfifo $out
+mkfifo "$in"
+mkfifo "$out"
 
 cleanup() {
-    rm -rf $TMPDIR
+  rm -rf "$TMPDIR"
 }
 
 decode() {
-    printf '%b' "${1//%/\\x}"
+  printf '%b' "${1//%/\\x}"
 }
 
 bot() {
-    local DEBUG=0
-    while IFS=: read stanza type from to body; do
-        case "$stanza" in
-            m) ;;
-            p) decode "$stanza:$type:$from:$to" 1>&2
-               echo 1>&2
-               continue
-               ;;
-            *) continue ;;
-        esac
+  local DEBUG=0
+  while IFS=: read stanza type from to body; do
+    case "$stanza" in
+      m) ;;
+      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 $MSG in
-            *"has set the subject to:"*) ;;
-            "sudo make me a sandwich")
-                echo "$USER: you're a sandwich"
-                ;;
-            sudo*)
-                echo "I'm sorry, $USER. I'm afraid I can't do that."
-                ;;
-            uptime)
-                uptime
-                ;;
-            runtime)
-                LC_ALL=POSIX ps -o etime= $$
-                ;;
-            exit)
-                echo "exiting ..."
-                exit 0
-                ;;
-            debug)
-                DEBUG=$(( DEBUG ? 0 : 1 ))
-                ;;
-            *)
-                if [ "$DEBUG" == "0" ]; then
-                    printf "%s: %s\n" "$USER" "$MSG"
-                else
-                    echo "$MSG"
-                fi
-                ;;
-        esac
-    done < $out
+    case $MSG in
+      *"has set the subject to:"*) ;;
+      "sudo make me a sandwich")
+        echo "$USER: you're a sandwich"
+        ;;
+      sudo*)
+        echo "I'm sorry, $USER. I'm afraid I can't do that."
+        ;;
+      uptime)
+        uptime
+        ;;
+      runtime)
+        LC_ALL=POSIX ps -o etime= $$
+        ;;
+      exit)
+        echo "exiting ..."
+        exit 0
+        ;;
+      debug)
+        DEBUG=$((DEBUG ? 0 : 1))
+        ;;
+      *)
+        if [ "$DEBUG" == "0" ]; then
+          printf "%s: %s\n" "$USER" "$MSG"
+        else
+          echo "$MSG"
+        fi
+        ;;
+    esac
+  done <"$out"
 }
 
-bot > $in &
-xmppipe "$@" <$in >$out
+bot >"$in" &
+xmppipe "$@" <"$in" >"$out"

examples/ssh-over-xmpp

@@ -17,7 +17,7 @@ set -o nounset
 set -o pipefail
 
 if [ "$DEBUG" ]; then
-set -x
+  set -x
 fi
 
 PROGNAME=$0
@@ -25,45 +25,50 @@ TMPDIR=$(mktemp -d)
 out=$TMPDIR/out
 
 atexit() {
-    rm -rf $TMPDIR
+  rm -rf "$TMPDIR"
 }
 
 decode() {
-    while IFS=: read stanza type from to body; do
-        case "$stanza" in
-            m) printf '%b' "${body//%/\\x}" ;;
-            *) ;;
-        esac
-    done
+  # shellcheck disable=SC2034
+  while IFS=: read stanza type from to body; do
+    case "$stanza" in
+      m) printf '%b' "${body//%/\\x}" ;;
+      *) ;;
+    esac
+  done
 }
 
 server() {
-    CONNECT=0
-    xmppipe -e -r server -o $1 -b 1024 -x < /dev/null | \
+  CONNECT=0
+  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
-                    exec "$PROGNAME" session $@
-                fi
-                ;;
-            *) ;;
-        esac
-    done > /dev/null
+      case "$stanza" in
+        p)
+          CONNECT=$((CONNECT + 1))
+          if [ "$CONNECT" -gt "1" ]; then
+            # shellcheck disable=SC2068
+            exec "$PROGNAME" session $@
+          fi
+          ;;
+        *) ;;
+      esac
+    done >/dev/null
 }
 
-session(){
-    mkdir -p $TMPDIR
-    trap atexit 0
+session() {
+  mkdir -p "$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
 $@