diff --git a/autogen.sh b/autogen.sh
index ac40874..065d654 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -19,11 +19,10 @@
 
 case "${1}" in
   '--reverse')
-    [[ -x configure ]] && ./configure --enable-maintainer-mode
     [[ -f Makefile ]] && make maintainer-clean
     rm -rf build-aux/
     rm -f {aclocal.m4,config.h.in,configure,shtool}
-    find . -type f -iregex '.*Makefile\.in$' -print0 | xargs -r0 rm -f
+    find . -type f -name 'Makefile.in' -print0 | xargs -r0 rm -f
   ;;
   * )
     autoreconf --force --install --include 'm4'
@@ -31,4 +30,3 @@ case "${1}" in
     [[ -d autom4te.cache ]] && rm -rf autom4te.cache
   ;;
 esac
-
diff --git a/configure.ac b/configure.ac
index f84500d..8e6b48e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,9 +15,9 @@ dnl implied. See the License for the specific language governing permissions
 dnl and limitations under the License.
 
 AC_PREREQ(2.69)
-AC_INIT([grenache-cli], [0.4.1], [davide@bitfinex.com])
+AC_INIT([grenache-cli], [0.5.0], [davide@bitfinex.com])
 
-AC_SUBST([VERSION], [0.4.1])
+AC_SUBST([VERSION], [0.5.0])
 AC_SUBST([SB], [`$srcdir/shtool echo -n -e %B`])
 AC_SUBST([EB], [`$srcdir/shtool echo -n -e %b`])
 
@@ -36,7 +36,7 @@ AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_SRCDIR([include/io.h])
 AC_CONFIG_HEADERS([config.h])
 
-AC_CANONICAL_TARGET
+AC_CANONICAL_HOST
 AM_INIT_AUTOMAKE([foreign no-dist-gzip dist-xz])
 
 AX_IS_RELEASE([git-directory])
@@ -240,5 +240,5 @@ AC_MSG_RESULT
 AC_MSG_RESULT
 AC_MSG_RESULT([==================================================])
 AX_MSG_OPTION([The binary will be optimized using], [${ax_cv_gcc_archflag}])
-AX_MSG_OPTION([This version was configured for], [${target}])
+AX_MSG_OPTION([This version was configured for], [${host_cpu}-${host_os}])
 AC_MSG_RESULT
diff --git a/src/grc-keygen.c b/src/grc-keygen.c
index cb861fe..64bfebe 100644
--- a/src/grc-keygen.c
+++ b/src/grc-keygen.c
@@ -75,7 +75,7 @@ int main(void) {
   }
 
 #ifdef HAVE_GETENTROPY
-  if (getentropy(seed, ED25519_SEED_SIZE) != ED25519_SEED_SIZE) {
+  if (getentropy(seed, ED25519_SEED_SIZE) != 0) {
 #else
   if (ed25519_create_seed(seed) != 0) {
 #endif
diff --git a/src/grenache-get.in b/src/grenache-get.in
index c56c517..794a99d 100644
--- a/src/grenache-get.in
+++ b/src/grenache-get.in
@@ -17,12 +17,13 @@
 # and limitations under the License.                                       #
 ############################################################################
 
-ME="${BASH_SOURCE[0]}"
-WHOAMI="$(@READLINK@ -snf "${ME}")"
-ARGV=$(@GETOPT@ -o 'g:hip:trvw' --long 'grape:,help,id,port:,tls,raw,value,write' -n "${ME##*/}" -- "$@") || exit 1
+readonly ME="${BASH_SOURCE[0]}"
+readonly WHOAMI="$(@READLINK@ -snf "${ME}")"
+readonly ARGV=$(@GETOPT@ -o 'g:hip:trvVw' --long 'grape:,help,id,port:,tls,raw,value,version,write' -n "${ME##*/}" -- "$@") || exit 1
 
 TLS=''
 PORT=30002
+EXIT_CODE=1
 HOSTNAME='127.0.0.1'
 QUERY='select(.v) | .v'
 
@@ -44,6 +45,7 @@ Usage:
         -w, --write             Get the write token
 
         -h, --help              Show this message
+        -V, --version           Show version information
 
     The order of the specified options is not relevant.
 _EOF
@@ -51,6 +53,20 @@ _EOF
   exit 1
 }
 
+# Show program's version.
+function show_version {
+  @CAT@ <<_EOF
+@PACKAGE_NAME@ (@host_cpu@-@host_os@) @PACKAGE_VERSION@
+Copyright (C) 2017, 2018 Davide Scola <@PACKAGE_BUGREPORT@>
+This is free software; see the  source for copying conditions.  There is
+NO warranty;  not even for  MERCHANTABILITY or FITNESS FOR  A PARTICULAR
+PURPOSE.
+
+_EOF
+
+  exit 1
+}
+
 
 while true; do
   case "$1" in
@@ -95,6 +111,9 @@ while true; do
     -v | --value )
       QUERY='select(.v) | .v'; shift 1
       ;;
+    -V | --version )
+      show_version; shift 1
+      ;;
     -w | --write )
       QUERY='select(.token) | .token'; shift 1
       ;;
@@ -113,67 +132,70 @@ done
   exit 1
 }
 
-exec {debug}>>/dev/null
+exec {stderr}>&2
+
+[[ x"${GRENACHE_CLI_DEBUG:+set}" != xset ]] && {
+  exec 2>/dev/null
+}
 
 for hash in "${@}"
 do
   [[ "${hash}" =~ ^[a-fA-F0-9]{40}$ ]] || {
-    echo "${ME##*/}: error: invalid hash provided: ${hash}." >&2
-
-    exec {debug}>&-
-    exit 1
+    echo "${ME##*/}: warning: invalid hash provided: ${hash}." >&"${stderr}"
+    continue
   }
 
   JSON="$(@CURL@ -qK "${HOME}/.grenache-cli/grenache-cli.conf" -A '@PACKAGE@/@PACKAGE_VERSION@' "http${TLS:+s}://${HOSTNAME}:${PORT}/get" < <( \
     @JQ@ -cnM \
       --arg 'data' "${hash}" \
       --arg 'rid' "$(@UUIDGEN@)" \
-      '{ "data": $data, "rid": $rid }' 2>&"${debug}" \
-  ) 2>&"${debug}")"
+      '{ "data": $data, "rid": $rid }' \
+  ))"
 
-  @JQ@ -e 'has("k")' >/dev/null 2>&"${debug}" <<<"${JSON}" && {
+  [[ -z "${JSON}" ]] && {
+    echo "${ME##*/}: warning: hash ${hash} not found." >&"${stderr}"
+    continue
+  }
+
+  @JQ@ -e 'has("k")' >/dev/null <<<"${JSON}" && {
     CHALLENGE=''
 
-    @JQ@ -e 'has("salt")' >/dev/null 2>&"${debug}" <<<"${JSON}" && {
-      CHALLENGE+="$(@JQ@ -cMjr '"4:salt\(.salt | length):\(.salt)"' 2>&"${debug}" <<<"${JSON}")"
+    @JQ@ -e 'has("salt")' >/dev/null <<<"${JSON}" && {
+      CHALLENGE+="$(@JQ@ -j '"4:salt\(.salt | length):\(.salt)"' <<<"${JSON}")"
     }
 
-    CHALLENGE+="$(@JQ@ -cMjr '"3:seqi" + "\(.seq)" + "e1:v" + "\(.v | length):\(.v)"' 2>&"${debug}" <<<"${JSON}")"
+    CHALLENGE+="$(@JQ@ -j '"3:seqi" + "\(.seq)" + "e1:v" + "\(.v | length):\(.v)"' <<<"${JSON}")"
 
     ${WHOAMI%/*}/grc-verify "${CHALLENGE}" \
       @PKEY_FILENO@< <( \
-        @JQ@ -cMr 'select(.k) | .k' <<<"${JSON}" 2>&"${debug}"
+        @JQ@ -r 'select(.k) | .k' <<<"${JSON}"
       ) \
       @SIGN_FILENO@< <( \
-        @JQ@ -cMr 'select(.sig) | .sig' <<<"${JSON}" 2>&"${debug}"
-      ) >/dev/null 2>&"${debug}" || {
-      echo "${ME##*/}: error: cannot verify challenge buffer." >&2
-
-      exec {debug}>&-
-      exit 1
+        @JQ@ -r 'select(.sig) | .sig' <<<"${JSON}"
+      ) >/dev/null || {
+      echo "${ME##*/}: warning: cannot verify challenge buffer." >&"${stderr}"
+      continue
     }
 
     CHECK="$(@SHA1SUM@ < <( \
       printf '%s' \
-        "$(@XXD@ -r -p < <( @JQ@ -cMr 'select(.k) | .k' <<<"${JSON}" 2>&"${debug}" ))" \
-        "$(@JQ@ -cMr 'select(.salt) | .salt' <<<"${JSON}" 2>&"${debug}")"
-      ) 2>&"${debug}" \
-    ) 2>&"${debug}")"
+        "$(@XXD@ -r -p < <( @JQ@ -r 'select(.k) | .k' <<<"${JSON}" ))" \
+        "$(@JQ@ -r 'select(.salt) | .salt' <<<"${JSON}")"
+    ))"
   } || {
     CHECK="$(@SHA1SUM@ < <( \
-      @JQ@ -cMjr 'select(.v) | "\(.v | length):\(.v)"' <<<"${JSON}" 2>&"${debug}"
-    ) 2>&"${debug}")"
+      @JQ@ -j 'select(.v) | "\(.v | length):\(.v)"' <<<"${JSON}"
+    ))"
   }
 
   [[ "x${hash}" = "x${CHECK%% *}" ]] || {
-    echo "${ME##*/}: error: unexpected value." >&2
-
-    exec {debug}>&-
-    exit 1
+    echo "${ME##*/}: warning: unexpected value." >&"${stderr}"
+    continue
   }
 
-  @JQ@ -cMr "${QUERY}" <<<"${JSON}" 2>&"${debug}"
+  @JQ@ -r "${QUERY}" <<<"${JSON}" \
+    && EXIT_CODE=0
 done
 
-exec {debug}>&-
-exit 0
+exec {stderr}>&-
+exit "${EXIT_CODE}"
diff --git a/src/grenache-keygen.in b/src/grenache-keygen.in
index 8537705..46a2f85 100644
--- a/src/grenache-keygen.in
+++ b/src/grenache-keygen.in
@@ -17,9 +17,9 @@
 # and limitations under the License.                                       #
 ############################################################################
 
-ME="${BASH_SOURCE[0]}"
-WHOAMI="$(@READLINK@ -snf "${ME}")"
-ARGV=$(@GETOPT@ -o 'fh' --long 'force,help' -n "${ME##*/}" -- "$@") || exit 1
+readonly ME="${BASH_SOURCE[0]}"
+readonly WHOAMI="$(@READLINK@ -snf "${ME}")"
+readonly ARGV=$(@GETOPT@ -o 'fhV' --long 'force,help,version' -n "${ME##*/}" -- "$@") || exit 1
 
 OVERWRITE='no'
 
@@ -35,6 +35,7 @@ Usage:
         -f, --force             Overwrite existing keypair
 
         -h, --help              Show this message
+        -V, --version           Show version information
 
     The order of the specified options is not relevant.
 _EOF
@@ -42,6 +43,20 @@ _EOF
   exit 1
 }
 
+# Show program's version.
+function show_version {
+  @CAT@ <<_EOF
+@PACKAGE_NAME@ (@host_cpu@-@host_os@) @PACKAGE_VERSION@
+Copyright (C) 2017, 2018 Davide Scola <@PACKAGE_BUGREPORT@>
+This is free software; see the  source for copying conditions.  There is
+NO warranty;  not even for  MERCHANTABILITY or FITNESS FOR  A PARTICULAR
+PURPOSE.
+
+_EOF
+
+  exit 1
+}
+
 
 while true; do
   case "$1" in
@@ -51,6 +66,9 @@ while true; do
     -h | --help )
       show_help; shift 1
       ;;
+    -V | --version )
+      show_version; shift 1
+      ;;
     -- ) shift; break ;;
     * ) break ;;
   esac
@@ -58,42 +76,54 @@ done
 
 
 umask 0077
-exec {debug}>>/dev/null
+exec {stderr}>&2
+
+[[ x"${GRENACHE_CLI_DEBUG:+set}" != xset ]] && {
+  exec 2>/dev/null
+}
 
 [[ "x${OVERWRITE}" = 'xno' ]] && {
   set -o noclobber
 }
 
-@MKDIR@ "${HOME}/.grenache-cli" 2>&"${debug}" && {
-  @CAT@ > "${HOME}/.grenache-cli/grenache-cli.conf" 2>&"${debug}" <<_EOF
+@MKDIR@ "${HOME}/.grenache-cli" && {
+  @CAT@ > "${HOME}/.grenache-cli/grenache-cli.conf" <<_EOF
 #
 # General
 #
 silent
-compress
+no-buffer
+max-time 10
+connect-timeout 5
 
 #
 # Request
 #
-data "@-"
+compressed
+tcp-nodelay
+tcp-fastopen
+request POST
+data-binary = "@-"
 
 #
 # Headers
 #
-header = "Connection:close"
-header = "Accept:application/json"
-header = "Content-Type:application/json; charset=UTF-8"
+header = "Connection: close"
+header = "Accept: application/json"
+header = "Content-Type: application/json; charset=UTF-8"
 _EOF
 }
 
-${WHOAMI%/*}/grc-keygen 2>&"${debug}" \
+${WHOAMI%/*}/grc-keygen \
     @SKEY_FILENO@> "${HOME}/.grenache-cli/key" \
     @PKEY_FILENO@> "${HOME}/.grenache-cli/key.pub" || { \
-  echo "${ME##*/}: error: cannot create new keypair." >&2
+  echo "${ME##*/}: error: cannot create new keypair." >&"${stderr}"
+
+  exec {stderr}>&-
   exit 1
 }
 
 echo "${ME##*/}: keypair generated successfully."
 
-exec {debug}>&-
+exec {stderr}>&-
 exit 0
diff --git a/src/grenache-lookup.in b/src/grenache-lookup.in
index 6ad7be0..8116ad0 100644
--- a/src/grenache-lookup.in
+++ b/src/grenache-lookup.in
@@ -17,9 +17,9 @@
 # and limitations under the License.                                       #
 ############################################################################
 
-ME="${BASH_SOURCE[0]}"
-WHOAMI="$(@READLINK@ -snf "${ME}")"
-ARGV=$(@GETOPT@ -o 'afg:hlp:rt' --long 'all,first,grape:,help,last,port:,random,tls' -n "${ME##*/}" -- "$@") || exit 1
+readonly ME="${BASH_SOURCE[0]}"
+readonly WHOAMI="$(@READLINK@ -snf "${ME}")"
+readonly ARGV=$(@GETOPT@ -o 'afg:hlp:rtV' --long 'all,first,grape:,help,last,port:,random,tls,version' -n "${ME##*/}" -- "$@") || exit 1
 
 TLS=''
 PORT=30002
@@ -50,6 +50,7 @@ Usage:
         -t, --tls               Enable TLS
 
         -h, --help              Show this message
+        -V, --version           Show version information
 
     The order of the specified options is not relevant.
 _EOF
@@ -57,6 +58,20 @@ _EOF
   exit 1
 }
 
+# Show program's version.
+function show_version {
+  @CAT@ <<_EOF
+@PACKAGE_NAME@ (@host_cpu@-@host_os@) @PACKAGE_VERSION@
+Copyright (C) 2017, 2018 Davide Scola <@PACKAGE_BUGREPORT@>
+This is free software; see the  source for copying conditions.  There is
+NO warranty;  not even for  MERCHANTABILITY or FITNESS FOR  A PARTICULAR
+PURPOSE.
+
+_EOF
+
+  exit 1
+}
+
 
 while true; do
   case "$1" in
@@ -104,6 +119,9 @@ while true; do
     -t | --tls )
       TLS='yes'; shift 1
       ;;
+    -V | --version )
+      show_version; shift 1
+      ;;
     -- ) shift; break ;;
     * ) break ;;
   esac
@@ -119,21 +137,25 @@ done
   exit 1
 }
 
-exec {debug}>>/dev/null
+exec {stderr}>&2
+
+[[ x"${GRENACHE_CLI_DEBUG:+set}" != xset ]] && {
+  exec 2>/dev/null
+}
 
 for service in "${@}"
 do
-  NODES=( $(@JQ@ -Mr '@tsv' < <( \
+  NODES=( $(@JQ@ -r '@tsv' < <( \
     @CURL@ -qK "${HOME}/.grenache-cli/grenache-cli.conf" -A '@PACKAGE@/@PACKAGE_VERSION@' "http${TLS:+s}://${HOSTNAME}:${PORT}/lookup" < <( \
       @JQ@ -cnM \
         --arg 'data' "${service}" \
         --arg 'rid' "$(@UUIDGEN@)" \
-        '{ "data": $data, "rid": $rid }' 2>&"${debug}" \
-    ) 2>&"${debug}" \
-  ) 2>&"${debug}") )
+        '{ "data": $data, "rid": $rid }' \
+    ) \
+  )) )
 
   [[ ${#NODES[@]} -eq 0 ]] && { \
-    echo "${ME##*/}: warning: service ${service} not available." >&2
+    echo "${ME##*/}: warning: service ${service} not available." >&"${stderr}"
     continue
   }
 
@@ -154,5 +176,5 @@ do
     && EXIT_CODE=0
 done
 
-exec {debug}>&-
+exec {stderr}>&-
 exit "${EXIT_CODE}"
diff --git a/src/grenache-put.in b/src/grenache-put.in
index 716b9da..ad2348b 100644
--- a/src/grenache-put.in
+++ b/src/grenache-put.in
@@ -17,9 +17,9 @@
 # and limitations under the License.                                       #
 ############################################################################
 
-ME="${BASH_SOURCE[0]}"
-WHOAMI="$(@READLINK@ -snf "${ME}")"
-ARGV=$(@GETOPT@ -o 'c:g:hm:n:p:s:t' --long 'cas:,grape:,help,mutable,number:,port:,salt:,tls' -n "${ME##*/}" -- "$@") || exit 1
+readonly ME="${BASH_SOURCE[0]}"
+readonly WHOAMI="$(@READLINK@ -snf "${ME}")"
+readonly ARGV=$(@GETOPT@ -o 'c:g:hm:n:p:s:tV' --long 'cas:,grape:,help,mutable,number:,port:,salt:,tls,version' -n "${ME##*/}" -- "$@") || exit 1
 
 TLS=''
 CAS=''
@@ -47,6 +47,7 @@ Usage:
         -t, --tls               Enable TLS
 
         -h, --help              Show this message
+        -V, --version           Show version information
 
     The order of the specified options is not relevant.
 _EOF
@@ -54,6 +55,20 @@ _EOF
   exit 1
 }
 
+# Show program's version.
+function show_version {
+  @CAT@ <<_EOF
+@PACKAGE_NAME@ (@host_cpu@-@host_os@) @PACKAGE_VERSION@
+Copyright (C) 2017, 2018 Davide Scola <@PACKAGE_BUGREPORT@>
+This is free software; see the  source for copying conditions.  There is
+NO warranty;  not even for  MERCHANTABILITY or FITNESS FOR  A PARTICULAR
+PURPOSE.
+
+_EOF
+
+  exit 1
+}
+
 
 while true; do
   case "$1" in
@@ -131,6 +146,9 @@ while true; do
     -t | --tls )
       TLS='yes'; shift 1
       ;;
+    -V | --version )
+      show_version; shift 1
+      ;;
     -- ) shift; break ;;
     * ) break ;;
   esac
@@ -146,12 +164,15 @@ done
   exit 1
 }
 
-exec {debug}>>/dev/null
-
 VALUE="${*}"
+exec {stderr}>&2
+
+[[ x"${GRENACHE_CLI_DEBUG:+set}" != xset ]] && {
+  exec 2>/dev/null
+}
 
 [[ "${#VALUE}" -gt 1000 ]] && {
-  echo "${ME##*/}: warning: value is too big and it will be truncated." >&2
+  echo "${ME##*/}: warning: value is too big and it will be truncated." >&"${stderr}"
   VALUE="${VALUE:0:1000}"
 }
 
@@ -166,7 +187,7 @@ ARGUMENTS=(
   PROPERTIES+=', "seq": $seq | tonumber, "k": $k'
   ARGUMENTS+=(
     --arg 'seq' "${SEQUENCE}"
-    --arg 'k' "$(@CAT@ ${HOME}/.grenache-cli/key.pub 2>&"${debug}")"
+    --arg 'k' "$(@CAT@ ${HOME}/.grenache-cli/key.pub)"
   )
 
   [[ "x${SALT}" != 'x' ]] && {
@@ -183,13 +204,12 @@ ARGUMENTS=(
   SIGNATURE="$(${WHOAMI%/*}/grc-sign "${CHALLENGE}" \
     @SKEY_FILENO@< "${HOME}/.grenache-cli/key" \
     @PKEY_FILENO@< "${HOME}/.grenache-cli/key.pub" \
-      2>&"${debug}"
   )"
 
   [[ "x${SIGNATURE}" = 'x' ]] && {
-    echo "${ME##*/}: error: cannot sign challenge buffer." >&2
+    echo "${ME##*/}: error: cannot sign challenge buffer." >&"${stderr}"
 
-    exec {debug}>&-
+    exec {stderr}>&-
     exit 1
   }
 
@@ -206,40 +226,40 @@ ARGUMENTS=(
   }
 }
 
-HASH="$(@JQ@ -cMr '.' < <(
+HASH="$(@JQ@ -r '.' < <(
   @CURL@ -qK "${HOME}/.grenache-cli/grenache-cli.conf" -A '@PACKAGE@/@PACKAGE_VERSION@' "http${TLS:+s}://${HOSTNAME}:${PORT}/put" < <( \
     @JQ@ -cnM \
       "${ARGUMENTS[@]}" \
       --arg 'rid' "$(@UUIDGEN@)" \
-      "{ "data": { ${PROPERTIES} }, "rid": \$rid }" 2>&"${debug}" \
-  ) 2>&"${debug}" \
-) 2>&"${debug}")"
+      "{ \"data\": { ${PROPERTIES} }, \"rid\": \$rid }" \
+  ) \
+))"
 
 [[ "${HASH}" =~ ^[a-fA-F0-9]{40}$ ]] || {
-  echo "${ME##*/}: error: ${HASH:-empty response received from Grape}." >&2
+  echo "${ME##*/}: error: ${HASH:-empty response received from Grape}." >&"${stderr}"
 
-  exec {debug}>&-
+  exec {stderr}>&-
   exit 1
 }
 
 [[ "x${MUTABLE}" == 'xyes' ]] && {
   CHECK="$(@SHA1SUM@ < <( \
-    printf '%s%s' "$(@XXD@ -r -p < <(@CAT@ ${HOME}/.grenache-cli/key.pub 2>&"${debug}") 2>&"${debug}")" "${SALT}" 2>&"${debug}" \
-  ) 2>&"${debug}")"
+    printf '%s%s' "$(@XXD@ -r -p < <(@CAT@ ${HOME}/.grenache-cli/key.pub))" "${SALT}" \
+  ))"
 } || {
   CHECK="$(@SHA1SUM@ < <( \
-    printf '%d:%s' "${#VALUE}" "${VALUE}" 2>&"${debug}" \
-  ) 2>&"${debug}")"
+    printf '%d:%s' "${#VALUE}" "${VALUE}" \
+  ))"
 }
 
 [[ "x${HASH}" = "x${CHECK%% *}" ]] || {
-  echo "${ME##*/}: error: unexpected hash value." >&2
+  echo "${ME##*/}: error: unexpected hash value." >&"${stderr}"
 
-  exec {debug}>&-
+  exec {stderr}>&-
   exit 1
 }
 
 echo "${HASH}"
 
-exec {debug}>&-
+exec {stderr}>&-
 exit 0