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How will you see Linux bit ?

The machine hardware name lists whether your system is 32-bit (“i686” or “i386”) or 64-bit (“x86_64”). Notice that the processor type and hardware platform also indicates 32-bit or 64-bit.
01_uname_a_command
To use the “uname” command to only find out whether your system is 32-bit or 64-bit, type the following command and press Enter.
uname –m
This displays only the machine hardware name and indicates, as above, whether your system is 32-bit (“i686” or “i386”) or 64-bit (“x86_64”).
02_uname_m_command
The “arch” command is similar to the “uname -m” command and prints to the screen whether your system is 32-bit (“i686”) or 64-bit (“x86_64”). Type the following command and press Enter.
arch
03_arch_command
You can also use the “file” command with a special argument (“/sbin/init”) to find out whether your system is 32-bit or 64-bit. Type the following command and press Enter.
file /sbin/init
The following output is printed to the screen. The text outlined in red indicates whether your system is 32-bit or 64-bit.
04_file_sbin_init_command
If you would rather use a graphical tool to find out whether your system is 32-bit or 64-bit, you can use the “System Settings.” Click the “System” menu button (gear button) in the upper-right corner of the screen and select “System Settings” from the drop-down menu.05_selecting_system_settings
On the “System Settings” dialog box, click “Details” in the “System” section, as shown below.
06_clicking_details
The “Details” screen displays. On the “Overview” screen, the “OS type” is listed as either “64-bit” or “32-bit,” along with other basic information about your Ubuntu system.
07_closing_settings

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