Install script is now POSIX compliant (tested with bash, ksh, zsh and dash)

ssh/install_altinea_pubkey.sh

@@ -6,7 +6,7 @@ ED25519_FINGERPRINT="SHA256:TagxgsBxZhHFWiThYwe/hZSYjLBOHWBY2Ss0QsipmTw noc@alti
 ED25519_KEYURL="https://gitlab.altinea.fr/altinea/install-scripts/raw/branch/master/ssh/altinea-ed25519.pub"
 
 if [ -x "$(which curl)" ] ; then
-	COMMAND="curl $"
+	COMMAND="curl -s "
 	echo "Found curl, using it"
 elif [ -x "$(which wget)" ]; then
 	COMMAND="wget -q -O - "
@@ -16,36 +16,31 @@ else
 	exit 3;
 fi
 
-if [[ ! -d ~/.ssh ]];
-then
+if [ ! -d ~/.ssh ]; then
 	mkdir ~/.ssh
 	chmod 700 ~/.ssh
 fi
 
-if [[ -w ~/.ssh/authorized_keys2 ]]
+if [ -w ~/.ssh/authorized_keys2 ]
 then
 	echo "It seems you're still relying on authorized_keys2, this is (almost) deprecated."
 	exit 1;
 else
 	touch ~/.ssh/authorized_keys
-	if [ $(grep -c "$RSA_FINGERPRINT" <(ssh-keygen -E sha256 -lf ~/.ssh/authorized_keys 2>/dev/null)) -eq 1 ]
+	if [ $(ssh-keygen -E sha256 -lf ~/.ssh/authorized_keys 2>/dev/null |grep -c "$RSA_FINGERPRINT") -ne 0 ]
 	then
 		echo "Altinea RSA CA fingerprint found in authorized_keys file, not adding"
-		exit 2;
 	else
 		$COMMAND $RSA_KEYURL >> ~/.ssh/authorized_keys
 		echo "Altinea RSA CA key deployed on account" `whoami`
-		exit 0;
 	fi
-	if [ $(grep -c "$ED25519_FINGERPRINT" <(ssh-keygen -E sha256 -lf ~/.ssh/authorized_keys 2>/dev/null)) -eq 1 ]
+	if [ $(ssh-keygen -E sha256 -lf ~/.ssh/authorized_keys 2>/dev/null |grep -c "$ED25519_FINGERPRINT") -ne 0 ]
 	then
 		echo "Altinea ED25519 CA fingerprint found in authorized_keys file, not adding"
-		exit 2;
 	else
 		$COMMAND $ED25519_KEYURL >> ~/.ssh/authorized_keys
 		echo "Altinea ED25519 CA key deployed on account" `whoami`
-		exit 0;
 	fi
 fi
 
-exit 99;
+exit 0;