diff --git a/certbot/files/letsencrypt-auto b/certbot/files/letsencrypt-auto
index 2a0cda9b..0e26e29a 100644
--- a/certbot/files/letsencrypt-auto
+++ b/certbot/files/letsencrypt-auto
@@ -497,7 +497,7 @@ Python36SclIsAvailable() {
 
 # Try to enable rh-python36 from SCL if it is necessary and possible.
 EnablePython36SCL() {
-  if "$EXISTS" python3.6 > /dev/null 2> /dev/null; then
+  if "$EXISTS" python3.6 > /dev/null 2>/dev/null; then
       return 0
   fi
   if [ ! -f /opt/rh/rh-python36/enable ]; then
@@ -815,7 +815,7 @@ elif [ -f /etc/redhat-release ]; then
   unset LE_PYTHON
   DeterminePythonVersion "NOCRASH"
 
-  RPM_DIST_NAME=`(. /etc/os-release 2> /dev/null && echo $ID) || echo "unknown"`
+  RPM_DIST_NAME=`(. /etc/os-release 2>/dev/null && echo $ID) || echo "unknown"`
 
   if [ "$PYVER" -eq 26 -a $(uname -m) != 'x86_64' ]; then
     # 32 bits CentOS 6 and affiliates are not supported anymore by certbot-auto.
@@ -825,7 +825,7 @@ elif [ -f /etc/redhat-release ]; then
   # Set RPM_DIST_VERSION to VERSION_ID from /etc/os-release after splitting on
   # '.' characters (e.g. "8.0" becomes "8"). If the command exits with an
   # error, RPM_DIST_VERSION is set to "unknown".
-  RPM_DIST_VERSION=$( (. /etc/os-release 2> /dev/null && echo "$VERSION_ID") | cut -d '.' -f1 || echo "unknown")
+  RPM_DIST_VERSION=$( (. /etc/os-release 2>/dev/null && echo "$VERSION_ID") | cut -d '.' -f1 || echo "unknown")
 
   # If RPM_DIST_VERSION is an empty string or it contains any nonnumeric
   # characters, the value is unexpected so we set RPM_DIST_VERSION to 0.
diff --git a/elasticsearch/tasks/logs.yml b/elasticsearch/tasks/logs.yml
index f7e2c0c0..01829dc9 100644
--- a/elasticsearch/tasks/logs.yml
+++ b/elasticsearch/tasks/logs.yml
@@ -1,7 +1,7 @@
 ---
 
 - name: Check if cron is installed
-  shell: "set -o pipefail && dpkg -l cron 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l cron 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   check_mode: no
diff --git a/etc-git/tasks/main.yml b/etc-git/tasks/main.yml
index 5d468f60..37d1c692 100644
--- a/etc-git/tasks/main.yml
+++ b/etc-git/tasks/main.yml
@@ -33,7 +33,7 @@
     - ansible_distribution_major_version is version('10', '>=')
 
 - name: Check if cron is installed
-  shell: "set -o pipefail && dpkg -l cron 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l cron 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   failed_when: False
diff --git a/evoacme/files/make-csr.sh b/evoacme/files/make-csr.sh
index edec8787..0641c1d5 100755
--- a/evoacme/files/make-csr.sh
+++ b/evoacme/files/make-csr.sh
@@ -112,9 +112,9 @@ openssl_selfsigned() {
     [ -r "${key}" ] || error "File ${key} is not readable"
     [ -w "${crt_dir}" ] || error "Directory ${crt_dir} is not writable"
     if grep -q SAN "${cfg}"; then
-        "${OPENSSL_BIN}" x509 -req -sha256 -days 365 -in "${csr}" -extensions SAN -extfile "${cfg}" -signkey "${key}" -out "${crt}" 2> /dev/null
+        "${OPENSSL_BIN}" x509 -req -sha256 -days 365 -in "${csr}" -extensions SAN -extfile "${cfg}" -signkey "${key}" -out "${crt}" 2>/dev/null
     else
-        "${OPENSSL_BIN}" x509 -req -sha256 -days 365 -in "${csr}" -signkey "${key}" -out "${crt}" 2> /dev/null
+        "${OPENSSL_BIN}" x509 -req -sha256 -days 365 -in "${csr}" -signkey "${key}" -out "${crt}" 2>/dev/null
     fi
 
     [ -r "${crt}" ] || error "Something went wrong, ${crt} has not been generated"
@@ -126,7 +126,7 @@ openssl_key(){
 
     [ -w "${key_dir}" ] || error "Directory ${key_dir} is not writable"
 
-    "${OPENSSL_BIN}" genrsa -out "${key}" "${size}" 2> /dev/null
+    "${OPENSSL_BIN}" genrsa -out "${key}" "${size}" 2>/dev/null
 
     [ -r "${key}" ] || error "Something went wrong, ${key} has not been generated"
 }
diff --git a/evobackup-client/templates/zzz_evobackup.default.sh.j2 b/evobackup-client/templates/zzz_evobackup.default.sh.j2
index 49de9744..fd2be5b4 100644
--- a/evobackup-client/templates/zzz_evobackup.default.sh.j2
+++ b/evobackup-client/templates/zzz_evobackup.default.sh.j2
@@ -124,7 +124,7 @@ pick_server() {
 if [ -e "${PIDFILE}" ]; then
     pid=$(cat "${PIDFILE}")
     # Does process still exist ?
-    if kill -0 "${pid}" 2> /dev/null; then
+    if kill -0 "${pid}" 2>/dev/null; then
         # Killing the childs of evobackup.
         for ppid in $(pgrep -P "${pid}"); do
             kill -9 "${ppid}";
diff --git a/evocheck/files/evocheck.sh b/evocheck/files/evocheck.sh
index 287982e2..7adf5757 100644
--- a/evocheck/files/evocheck.sh
+++ b/evocheck/files/evocheck.sh
@@ -109,7 +109,7 @@ is_pack_samba(){
 }
 is_installed(){
     for pkg in "$@"; do
-        dpkg -l "$pkg" 2> /dev/null | grep -q -E '^(i|h)i' || return 1
+        dpkg -l "$pkg" 2>/dev/null | grep -q -E '^(i|h)i' || return 1
     done
 }
 minifirewall_file() {
diff --git a/evocheck/tasks/cron.yml b/evocheck/tasks/cron.yml
index aac3f927..ecf1e1d0 100644
--- a/evocheck/tasks/cron.yml
+++ b/evocheck/tasks/cron.yml
@@ -1,7 +1,7 @@
 ---
 
 - name: Check if cron is installed
-  shell: "set -o pipefail && dpkg -l cron 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l cron 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   failed_when: False
diff --git a/evolinux-base/tasks/system.yml b/evolinux-base/tasks/system.yml
index 51bcb6e3..53fa243c 100644
--- a/evolinux-base/tasks/system.yml
+++ b/evolinux-base/tasks/system.yml
@@ -85,7 +85,7 @@
 #- name: Customizing /etc/fstab
 
 - name: Check if cron is installed
-  shell: "set -o pipefail && dpkg -l cron 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l cron 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   check_mode: no
diff --git a/kvm-host/files/kvmstats.sh b/kvm-host/files/kvmstats.sh
index cf2416b9..5fa20ccb 100755
--- a/kvm-host/files/kvmstats.sh
+++ b/kvm-host/files/kvmstats.sh
@@ -65,13 +65,13 @@ do
 
     # mem
     # libvirt stores memory in KiB, POW must be lowered by 1
-    virsh dommemstat "$VM" 2> /dev/null | awk 'BEGIN{ret=1}$1~/^actual$/{print $2 / '$((POW / 1024))';ret=0}END{exit ret}' ||
+    virsh dommemstat "$VM" 2>/dev/null | awk 'BEGIN{ret=1}$1~/^actual$/{print $2 / '$((POW / 1024))';ret=0}END{exit ret}' ||
         virsh dumpxml "$VM" | awk -F'[<>]' '$2~/^memory unit/{print $3/'$((POW / 1024))'}'
 
     # disk
     for BLK in $(virsh domblklist "$VM" | sed '1,2d;/-$/d;/^$/d' | awk '{print $1}')
     do
-        virsh domblkinfo "$VM" "$BLK" 2> /dev/null
+        virsh domblkinfo "$VM" "$BLK" 2>/dev/null
     done | awk '/Physical:/ { size += $2 } END { print int(size / '${POW}') }'
 
     # state
diff --git a/logstash/tasks/logs.yml b/logstash/tasks/logs.yml
index 9eb98c1a..975cd8bc 100644
--- a/logstash/tasks/logs.yml
+++ b/logstash/tasks/logs.yml
@@ -1,6 +1,6 @@
 ---
 - name: Check if cron is installed
-  shell: "set -o pipefail && dpkg -l cron 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l cron 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   check_mode: no
diff --git a/percona/tasks/main.yml b/percona/tasks/main.yml
index dc182e10..b14c4876 100644
--- a/percona/tasks/main.yml
+++ b/percona/tasks/main.yml
@@ -19,7 +19,7 @@
     group: root
 
 - name: Check if percona-release is installed
-  shell: "set -o pipefail && dpkg -l percona-release 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l percona-release 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   check_mode: no
diff --git a/postfix/tasks/packmail.yml b/postfix/tasks/packmail.yml
index b0476edd..80f90232 100644
--- a/postfix/tasks/packmail.yml
+++ b/postfix/tasks/packmail.yml
@@ -98,7 +98,7 @@
   - postfix
 
 - name: Check if cron is installed
-  shell: "set -o pipefail && dpkg -l cron 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l cron 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   check_mode: no
diff --git a/spamassasin/tasks/main.yml b/spamassasin/tasks/main.yml
index 497c4698..a7568391 100644
--- a/spamassasin/tasks/main.yml
+++ b/spamassasin/tasks/main.yml
@@ -66,7 +66,7 @@
     - spamassassin
 
 - name: Check if cron is installed
-  shell: "set -o pipefail && dpkg -l cron 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l cron 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   check_mode: no
diff --git a/ssl/tasks/main.yml b/ssl/tasks/main.yml
index 36de4b35..3ec71115 100644
--- a/ssl/tasks/main.yml
+++ b/ssl/tasks/main.yml
@@ -29,7 +29,7 @@
     - ssl
 
 - name: Check if Haproxy is installed
-  shell: "set -o pipefail && dpkg -l haproxy 2> /dev/null | grep -q -E '^(i|h)i'"
+  shell: "set -o pipefail && dpkg -l haproxy 2>/dev/null | grep -q -E '^(i|h)i'"
   args:
     executable: /bin/bash
   register: haproxy_check