How to Check Which Bash We Are Using

The easiest method is still the cat etcissue command but this is a nice extra. We can use the below command to check the Linux Operating System OS cat procversion.

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If you try to see the process information it should show you the process name ie.

. Sudo ss -tulpn grep LISTEN. In this example well use which and pass the name of the program were investigating as a command-line parameter. Sudo lsof -i -P -n grep LISTEN.

The version of the distribution you are running is actually a completely different thing than the version of the Linux kernel. To evaluate the conditions bash has a built-in command called test. Its the other way around.

Is a bash-ism by the way. Echo SUCCESS echo FAIL. So the bash code to do such a check would be along the lines of.

And are for string comparisons -eq is for numeric ones. Here are a few ways to find out which Linux distro you are using. Square brackets are the same as the test command so you can use either test command or square brackets.

The problem I have with the if syntax is that it has to be very precise. The issue we demonstrated above is why the which command was designed. Here the command is split into two sections by the sign.

The command below takes into consideration that you are in the same directory as the file bash script is in. -eq is in the same family as -lt -le -gt -ge and -ne if that helps you remember which is which. LSB Stands for Linux Standard Base we can check the Linux Operating System OS using lsb_release command lsb_release -a.

Otherwise the second echo command will run. Ps -p The output should be like this. Open a terminal application ie.

If the first command runs successfully the first echo command must run. The x command will make sure the file is executable by everyone in the environment. Df -h it will display the result in a human-readable format.

Using version file available in Linuxs proc directory. Every command has a version number for checking the version of the ls command you are using. You can also use 0.

To find out what version of the Linux kernel is running on your system type the following command. After the permission of the file is taken care of we can now simply execute the file as follows. It is basically a one liner of.

0 can be the name of the shell or the name of shell script. Netstat is a command-line tool that can provide information about network connections. The uname command displays several system information including the Linux kernel architecture name version and release.

You can type the following command in your terminal to see which shell you are using. To get more details about the ls command you can run the ls command along with the --help option. MachineUNKNOWNunameOut esac echo machine.

Run any one of the following command on Linux to see open ports. Df -k to display file system usage in KB. GNU GPL version 3 or later.

To list all TCP or UDP ports that are being listened on including the services using the ports and the socket status use the following command. Show ls Command Help Page. The output above tells us that the Linux kernel is 64-bit and its version is 490-8-amd64.

You can easily see that version number by opening a terminal and typing in the following. Echo 0 The result will look something similar to the below if you are using the bash Bourne Again Shell terminal-bash. This method works best on modern Linux distributions.

Check Bash version using bash command. These are the most popular options. PID TTY TIME CMD 15012 pts0 000000 zsh Method 2.

Which reports its found a version of htg in the usrlocalbin directory. To make them permanent across different shell sessions we need to add them to our bashrc file. Its just a one-line command thats very simple.

The easiest way to check bash version number is by executing the shell bash command with --version command option. The changes we have made will only last until we close the current Bash shell. Its better to use the POSIX.

You have to use square brackets something otherthing and even if just a space at the start or end is missing your statement will break. UnameOutuname -s case unameOut in Linux machineLinux. The options used in this command have the following meaning-t - Show TCP ports-u - Show UDP ports.

Lets check it out with an example. Type -a test test is a shell builtin test is usrbintest test is bintest. Somethingbah otherthingbah if something otherthing then echo yeah fi.

Here we are finding the parent process ID PPID of the shell bash by ps -o ppid -p which will be the process ID of terminal program. In bash the two are equivalent and in plain sh is the only one guaranteed to work. Df -m this command line is used to display information of file system usage in MB.

Sudo netstat -tulpn grep LISTEN. Bash --version bash --version GNU bash version 4418 1-release x86_64-pc-linux-gnu Copyright C 2016 Free Software Foundation Inc. Sudo lsof -i22 see a specific port such as 22.

The which Command. Df -T this option will show the file system type a new column will appear. Ps -o cmd -p ps -o ppid -p gnome-terminal.

Sudo nmap -sTU -O IP-address-Here. Then we are finding the process name from the PID. In your home directory type the following command to open the bashrc file in the Gedit graphical text editor or change it accordingly to use the editor of.

You can run the ls command with the --version option. How to See the Kernel Version.

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