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+[#]: collector: (lujun9972)
+[#]: translator: ( )
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (Bash Script to View System Information on Linux Every Time You Log into Shell)
+[#]: via: (https://www.2daygeek.com/bash-shell-script-view-linux-system-information/)
+[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
+
+Bash Script to View System Information on Linux Every Time You Log into Shell
+======
+
+There are several commands in Linux to obtain system information such as processor information, manufacturer name, and serial number, etc,.
+
+You may need to run several commands to collect this information.
+
+Also, it is very difficult to remember all the commands and their options.
+
+Instead you can write a **[shell script][1]** to customize the output based on your needs.
+
+In the past we have written many **[bash scripts][2]** for a variety of purposes.
+
+Today, we came up with a new shell script, which shows you the required system information every time you log into the shell.
+
+There are six parts to this script, and more details below.
+
+ * **Part-1:** General System Information
+ * **Part-2:** CPU/Memory Current Usage
+ * **Part-3:** Disk Usage >80%
+ * **Part-4:** List System WWN Details
+ * **Part-5:** Oracle DB Instances
+ * **Part-6:** Available Package Updates
+
+
+
+We’ve added potential information to each area based on our needs. You can further customize this script to your needs if you wish.
+
+There are many tools for this, most of which we have already covered.
+
+To read them, go to the following articles.
+
+ * **[inxi – A Great Tool to Check Hardware Information on Linux][3]**
+ * **[Dmidecode – Easy Way To Get Linux System Hardware Information][3]**
+ * **[LSHW (Hardware Lister) – A Nifty Tool To Get A Hardware Information On Linux][3]**
+ * **[hwinfo (Hardware Info) – A Nifty Tool To Detect System Hardware Information On Linux][3]**
+ * **[python-hwinfo : Display Summary Of Hardware Information Using Standard Linux Utilities][3]**
+ * **[How To Use lspci, lsscsi, lsusb, And lsblk To Get Linux System Devices Information][3]**
+ * **[How To Check System Hardware Manufacturer, Model And Serial Number In Linux][3]**
+ * **[How To Find WWN, WWNN and WWPN Number Of HBA Card In Linux][3]**
+ * **[How to check HP iLO Firmware version from Linux command line][3]**
+ * **[How to check Wireless network card and WiFi information from Linux Command Line][3]**
+ * **[How to check CPU & Hard Disk temperature on Linux][3]**
+ * **[Hegemon – A modular System & Hardware monitoring tool for Linux][3]**
+ * **[How to Check System Configuration and Hardware Information on Linux][3]**
+
+
+
+If anyone wants to add any other information in the script, please let us know your requirements in the comment section so that we can help you.
+
+### Bash Script to View System Information on Linux Every Time You Log into the Shell
+
+This basic script will bring the system information to your terminal whenever you log into the shell.
+
+```
+#vi /opt/scripts/system-info.sh
+
+#!/bin/bash
+echo -e "-------------------------------System Information----------------------------"
+echo -e "Hostname:\t\t"`hostname`
+echo -e "uptime:\t\t\t"`uptime | awk '{print $3,$4}' | sed 's/,//'`
+echo -e "Manufacturer:\t\t"`cat /sys/class/dmi/id/chassis_vendor`
+echo -e "Product Name:\t\t"`cat /sys/class/dmi/id/product_name`
+echo -e "Version:\t\t"`cat /sys/class/dmi/id/product_version`
+echo -e "Serial Number:\t\t"`cat /sys/class/dmi/id/product_serial`
+echo -e "Machine Type:\t\t"`vserver=$(lscpu | grep Hypervisor | wc -l); if [ $vserver -gt 0 ]; then echo "VM"; else echo "Physical"; fi`
+echo -e "Operating System:\t"`hostnamectl | grep "Operating System" | cut -d ' ' -f5-`
+echo -e "Kernel:\t\t\t"`uname -r`
+echo -e "Architecture:\t\t"`arch`
+echo -e "Processor Name:\t\t"`awk -F':' '/^model name/ {print $2}' /proc/cpuinfo | uniq | sed -e 's/^[ \t]*//'`
+echo -e "Active User:\t\t"`w | cut -d ' ' -f1 | grep -v USER | xargs -n1`
+echo -e "System Main IP:\t\t"`hostname -I`
+echo ""
+echo -e "-------------------------------CPU/Memory Usage------------------------------"
+echo -e "Memory Usage:\t"`free | awk '/Mem/{printf("%.2f%"), $3/$2*100}'`
+echo -e "Swap Usage:\t"`free | awk '/Swap/{printf("%.2f%"), $3/$2*100}'`
+echo -e "CPU Usage:\t"`cat /proc/stat | awk '/cpu/{printf("%.2f%\n"), ($2+$4)*100/($2+$4+$5)}' | awk '{print $0}' | head -1`
+echo ""
+echo -e "-------------------------------Disk Usage >80%-------------------------------"
+df -Ph | sed s/%//g | awk '{ if($5 > 80) print $0;}'
+echo ""
+
+echo -e "-------------------------------For WWN Details-------------------------------"
+vserver=$(lscpu | grep vendor | wc -l)
+if [ $vserver -gt 0 ]
+then
+echo "$(hostname) is a VM"
+else
+systool -c fc_host -v | egrep "(Class Device path | port_name |port_state)" > systool.out
+fi
+echo ""
+
+echo -e "-------------------------------Oracle DB Instances---------------------------"
+if id oracle >/dev/null 2>&1; then
+/bin/ps -ef|grep pmon
+then
+else
+echo "oracle user does not exist on $(hostname)"
+fi
+echo ""
+
+if (( $(cat /etc/*-release | grep -w "Oracle|Red Hat|CentOS|Fedora" | wc -l) > 0 ))
+then
+echo -e "-------------------------------Package Updates-------------------------------"
+yum updateinfo summary | grep 'Security|Bugfix|Enhancement'
+echo -e "-----------------------------------------------------------------------------"
+else
+echo -e "-------------------------------Package Updates-------------------------------"
+cat /var/lib/update-notifier/updates-available
+echo -e "-----------------------------------------------------------------------------"
+fi
+```
+
+Once the above script is added to a file. Set the executable permission for the “system-info.sh” file.
+
+```
+# chmod +x ~root/system-info.sh
+```
+
+When the script is ready, add the file path at the end of the “.bash_profile” file in RHEL-based systems CentOS, Oracle Linux and Fedora.
+
+```
+# echo "/root/system-info.sh" >> ~root/.bash_profile
+```
+
+To take this change effect, run the following command.
+
+```
+# source ~root/.bash_profile
+```
+
+For Debian-based systems, you may need to add a file path to the “.profile” file.
+
+```
+# echo "/root/system-info.sh" >> ~root/.profile
+```
+
+Run the following command to take this change effect.
+
+```
+# source ~root/.profile
+```
+
+You may have seen an output like the one below when running the above “source” command.
+
+From next time on-wards, you will get this information every time you log into the shell.
+
+Alternatively, you can manually run this script at any time if you need to.
+
+```
+-------------------------------System Information---------------------------
+Hostname: daygeek-Y700
+uptime: 1:20 1
+Manufacturer: LENOVO
+Product Name: 80NV
+Version: Lenovo ideapad Y700-15ISK
+Serial Number: AA0CMRN1
+Machine Type: Physical
+Operating System: Manjaro Linux
+Kernel: 4.19.80-1-MANJARO
+Architecture: x86_64
+Processor Name: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
+Active User: daygeek renu thanu
+System Main IP: 192.168.1.6 192.168.122.1
+
+-------------------------------CPU/Memory Usage------------------------------
+Memory Usage: 37.28%
+Swap Usage: 0.00%
+CPU Usage: 15.43%
+
+-------------------------------Disk Usage >80%-------------------------------
+Filesystem Size Used Avail Use Mounted on
+/dev/nvme0n1p1 217G 202G 4.6G 98 /
+/dev/loop0 109M 109M 0 100 /var/lib/snapd/snap/odrive-unofficial/2
+/dev/loop1 91M 91M 0 100 /var/lib/snapd/snap/core/6405
+/dev/loop2 90M 90M 0 100 /var/lib/snapd/snap/core/7713
+
+-------------------------------For WWN Details-------------------------------
+CentOS8.2daygeek.com is a VM
+
+-------------------------------Oracle DB Instances---------------------------
+oracle user does not exist on CentOS8.2daygeek.com
+
+-------------------------------Package Updates-------------------------------
+ 13 Security notice(s)
+ 9 Important Security notice(s)
+ 3 Moderate Security notice(s)
+ 1 Low Security notice(s)
+ 35 Bugfix notice(s)
+ 1 Enhancement notice(s)
+-----------------------------------------------------------------------------
+```
+
+--------------------------------------------------------------------------------
+
+via: https://www.2daygeek.com/bash-shell-script-view-linux-system-information/
+
+作者：[Magesh Maruthamuthu][a]
+选题：[lujun9972][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://www.2daygeek.com/author/magesh/
+[b]: https://github.com/lujun9972
+[1]: https://www.2daygeek.com/category/shell-script/
+[2]: https://www.2daygeek.com/category/bash-script/
+[3]: https://www.2daygeek.com/inxi-system-hardware-information-on-linux/