Shell formatting

deployment_scripts/deploy_linux.sh

@@ -1,9 +1,13 @@
 #!/bin/bash
 source config
 
+exists() {
+  command -v "$1" >/dev/null 2>&1
+}
+
 # Setup monkey either in dir required or current dir
-monkey_home=${1:-`pwd`}
-if [[ $monkey_home == `pwd` ]]; then
+monkey_home=${1:-$(pwd)}
+if [[ $monkey_home == $(pwd) ]]; then
   monkey_home="$monkey_home/$MONKEY_FOLDER_NAME"
 fi
 
@@ -57,13 +61,13 @@ mkdir -p ${ISLAND_BINARIES_PATH} || handle_error
 
 # Detecting command that calls python 3.7
 python_cmd=""
-if [[ `python --version 2>&1` == *"Python 3.7"* ]]; then
+if [[ $(python --version 2>&1) == *"Python 3.7"* ]]; then
   python_cmd="python"
 fi
-if [[ `python37 --version 2>&1` == *"Python 3.7"* ]]; then
+if [[ $(python37 --version 2>&1) == *"Python 3.7"* ]]; then
   python_cmd="python37"
 fi
-if [[ `python3.7 --version 2>&1` == *"Python 3.7"* ]]; then
+if [[ $(python3.7 --version 2>&1) == *"Python 3.7"* ]]; then
   python_cmd="python3.7"
 fi
 
@@ -105,10 +109,9 @@ wget -c -N -P ${ISLAND_BINARIES_PATH} ${WINDOWS_64_BINARY_URL}
 chmod a+x "$ISLAND_BINARIES_PATH/$LINUX_32_BINARY_NAME"
 chmod a+x "$ISLAND_BINARIES_PATH/$LINUX_64_BINARY_NAME"
 
-
 # Get machine type/kernel version
-kernel=`uname -m`
-linux_dist=`lsb_release -a 2> /dev/null`
+kernel=$(uname -m)
+linux_dist=$(lsb_release -a 2>/dev/null)
 
 # If a user haven't installed mongo manually check if we can install it with our script
 log_message "Installing MongoDB"
@@ -149,7 +152,6 @@ log_message "Downloading traceroute binaries"
 wget -c -N -P ${MONKEY_BIN_DIR} ${TRACEROUTE_64_BINARY_URL}
 wget -c -N -P ${MONKEY_BIN_DIR} ${TRACEROUTE_32_BINARY_URL}
 
-
 sudo chmod +x ${monkey_home}/monkey/infection_monkey/build_linux.sh
 
 log_message "Deployment script finished."