fix: sysVer of older CentOS

lib/data/res/server_cmd.dart

@@ -3,32 +3,44 @@ import 'build_data.dart';
 const seperator = 'SrvBox';
 const serverBoxDir = r'$HOME/.config/server_box';
 const shellPath = '$serverBoxDir/mobile_app.sh';
-const installShellCmd =
-    "mkdir -p $serverBoxDir && echo '$shellCmd' > $shellPath && chmod +x $shellPath";
 
-const shellCmd = """
-# Script for app `${BuildData.name}`
+enum CmdType {
+  export,
+  net,
+  sys,
+  cpu,
+  uptime,
+  conn,
+  disk,
+  mem,
+  tempType,
+  tempVal,
+  host,
+  sysRhel,
+}
+
+const _cmdList = [
+  'export LANG=en_US.utf-8',
+  'cat /proc/net/dev && date +%s',
+  'cat /etc/os-release | grep PRETTY_NAME',
+  'cat /proc/stat | grep cpu',
+  'uptime',
+  'cat /proc/net/snmp',
+  'df -h',
+  'cat /proc/meminfo',
+  'cat /sys/class/thermal/thermal_zone*/type',
+  'cat /sys/class/thermal/thermal_zone*/temp',
+  'hostname',
+  'cat /etc/redhat-release',
+];
+
+final shellCmd = """
+# Script for app `${BuildData.name} v${BuildData.build}`
 # Delete this file while app is running will cause app crash
 
-export LANG=en_US.utf-8
-echo $seperator
-cat /proc/net/dev && date +%s
-echo $seperator
-cat /etc/os-release | grep PRETTY_NAME
-echo $seperator
-cat /proc/stat | grep cpu
-echo $seperator
-uptime
-echo $seperator
-cat /proc/net/snmp
-echo $seperator
-df -h
-echo $seperator
-cat /proc/meminfo
-echo $seperator
-cat /sys/class/thermal/thermal_zone*/type
-echo $seperator
-cat /sys/class/thermal/thermal_zone*/temp
-echo $seperator
-hostname
+${_cmdList.join('\necho $seperator\n')}
 """;
+
+final installShellCmd = "mkdir -p $serverBoxDir && "
+    "echo '$shellCmd' > $shellPath && "
+    "chmod +x $shellPath";