How to check root partition with fsck?

I installed Linux Mint 12 KDE, and I would like to check the root partition for any errors.

How do I check the root partition with fsck at boot time?

asked Mar 15, 2012 at 21:26

BlueSky's user avatar

sudo touch /forcefsck

answered Mar 16, 2012 at 2:42

psusi's user avatar

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You can use shutdown command for this too.

shutdown -rF now

The -F flag means ‘force fsck’.
This only creates an advisory file /forcefsck which can be tested by the system when it comes up again. The boot rc file can test if this file is present, and decide to run fsck(1) with a special `force’ flag so that even properly unmounted file systems get checked. After that, the boot process should remove /forcefsck.

answered Jun 4, 2012 at 17:44

insider's user avatar

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Here is another way to do this:

tune2fs -C 2 -c 1 /dev/THEDEVTHATROOTIS

then the filesystem will be checked, and once all is good you should do

tune2fs -c 60 /dev/THEDEVTHATROOTIS

I have assumed that the max-mount-count was set to 60, you should find out before issuing the first command with

answered Apr 7, 2012 at 18:54

g24l's user avatar

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On my systems (several x86 notebooks and a Banana Pi Pro), saying sudo shutdown now brings me to runlevel 1 (aka maintenance mode) where I can safely check my root FS:

mount -o remount,ro /dev/rootpartition
fsck /dev/rootpartition
reboot

There’s no need to alter /etc/fstab to do this, and I have the opportunity to run fsck with whatever options that may be needed to fix a tricky case.

Note: /forcefsck and tune2fs tricks work on x86, but not on Banana Pi.

answered Sep 16, 2015 at 18:06

Dmitry Grigoryev's user avatar

Dmitry Grigoryev

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If you are on a Raspberry pi and you find yourself in emergency mode, you can in fact unmount the root partition and still use fsck

(login as root)
mount -o remount,ro /
fsck
reboot

answered Apr 7, 2019 at 21:16

Nino van Hooff's user avatar

On modern linux systems the answers above (with forcefsck) don’t work. You have to do it manually:

  1. Put your root partition into read-only mode by modifying the faulty partition’s line on /etc/fstab (but remember your old settings):

    UUID=fd1d0fad-3a4c-457f-9b5e-eed021cce3d1 /                       ext4    remount,ro        1 1
    
  2. Switch to runlevel 1 just to minimize the amount of interfering processes:

    init 1
    
  3. Fix your file system (replace /dev/sda2 with your partition’s device), which should now work because the root partition is in read only:

    fsck /dev/sda2
    
  4. Reboot. (On my Fedora 21 system I had to change to runlevel 1 during boot with Grub2, because otherwise the system was stuck due to not being able to write on the root-partition)

  5. Make your root file system readable/writable:

    mount -o remount,rw /dev/sda2
    
  6. Restore your /etc/fstab to its original state.


answered Jul 28, 2015 at 0:48

erik's user avatar

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Содержание
  1. Displays current user
  2. Check if running as root in a bash script
  3. Conclusion
  4. Check if a shell script running as non-root user
  5. Conclusion
  6. How do I check if a user is privileged in Linux?
  7. What command gets root privileges in Linux?
  8. How do I give a user root privileges in Linux?
  9. How do I know if user is root user or sudo in Linux?
  10. How do I know if I am the root user?
  11. How do you check what privileges a user has in Linux?
  12. How do I know if I have admin privileges Linux?
  13. What are user privileges in Linux?
  14. How do I change user privileges in Linux?
  15. How do I get root privileges in Linux?
  16. What is the command for root privilege?
  17. Which command is run with root privileges in Linux?
  18. How do I give root privileges to a file in Linux?
  19. How do I give a user root privileges in Linux without sudo?
  20. How do I add a user and grant root privileges?
  21. How do I give root power to user?
  22. How do you know if a user is a root user in Linux?
  23. How do I know if my account is sudo?
  24. How do I see sudo users in Linux?
  25. How do I find my root username?
  26. How do I make myself a root user?
  27. How do I know if a process is running as root?
  28. How do you see what privileges a user has in Ubuntu?
  29. How do I check permissions?
  30. How do I know if user is root or sudo?
  31. Bash script to check if a specific user is present in etc passwd
  32. Images related to the topicBash script to check if a specific user is present in etc passwd
  33. How do I find my root username in Linux?
  34. How do you check what permissions a user has in Linux?
  35. What is root in terminal?
  36. See some more details on the topic bash check if user is root here
  37. How do I check if I have root access? – Unix Stack Exchange
  38. Check the bash shell script is being run by root or not – nixCraft
  39. Check if user is root/sudo before running a script – The Electric …
  40. How do I check if a user has root access in Linux? – OS Today
  41. What is the user ID of root?
  42. Shell Script Check If Directory Exists – Folder – Linux – BASH – tutorial
  43. Images related to the topicShell Script Check If Directory Exists – Folder – Linux – BASH – tutorial
  44. How do I access root?
  45. How do you check user permissions in Unix?
  46. How do I give a user root access in Linux?
  47. What does chmod 777 mean?
  48. How do you find if a user has permissions on a particular file?
  49. Is a root user in Linux?
  50. Complete Shell Scripting | Run shell script with root user or with sudo privilage
  51. Images related to the topicComplete Shell Scripting | Run shell script with root user or with sudo privilage
  52. How do I login as root in terminal?
  53. Information related to the topic bash check if user is root
  54. How To check user configured with root privileges
  55. Check if user is root in C?
  56. How can my C/C++ application determine if the root user is executing the command?
  57. How to get root privileges from process
  58. How can a script check if it’s being run as root?
  59. How to know if I have root privileges in Linux Shell terminal
  60. How to know if I am a root user in Linux
  61. Linux Command Line (13) The Root User
  62. Checking for root user in sh and bash [duplicate]
  63. How do I determine if a shell script is running with root permissions?
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Displays current user

whoami

how-to-check-if-running-as-root-in-a-bash-script-01 How to check if running as root in a bash script

The second command you can use.

echo $EUID

What is EUID? from the man page:

fix-error-configuring-terraform-aws-provider How to check if running as root in a bash script

Check if running as root in a bash script

if (( $EUID == 0 )); then
    echo "You are root"
    // Do commands if user is root
else
    echo "You are normal user"
    // Do command if user not is root
fi

Conclusion

(This is an article from my old blog that has been inactive for a long time, I don’t want to throw it away so I will keep it and hope it helps someone).

Check if a shell script running as non-root user

Conclusion

How do I check if a user is privileged in Linux?

What command gets root privileges in Linux?

the su Command

How do I give a user root privileges in Linux?

How do I know if user is root user or sudo in Linux?

  • Check sudo access as normal user.
  • Method 1: Using sudo -l or list. Pros. Cons.
  • Method 2: Using sudo -v or validate. Pros. Cons.
  • Method 3: Use sudo with timeout. Example Script. Pros. Cons.
  • Method 4: Using sudo with -S or stdin. Example Script. Pros. Cons.
  • Conclusion.
  • How do I know if I am the root user?

    How do you check what privileges a user has in Linux?

  • ls -l. Then you will see the file’s permissions, like the following:
  • chmod o+w section.txt.
  • chmod u+x section.txt.
  • chmod u-x section.txt.
  • chmod 777 section.txt.
  • chmod 765 section.txt.
  • sudo useradd testuser.
  • uid1007(testuser) gid1009(testuser) groups1009(testuser)
  • How do I know if I have admin privileges Linux?

    What are user privileges in Linux?

    How do I change user privileges in Linux?

  • chmod +rwx filename to add permissions.
  • chmod -rwx directoryname to remove permissions.
  • chmod +x filename to allow executable permissions.
  • chmod -wx filename to take out write and executable permissions.
  • How do I get root privileges in Linux?

    How to get root access on Linux operating system?

  • Please click on the lower left corner of the icon (start button).
  • Click Terminal menu item to open the terminal.
  • Input the command below: % sudo su
  • Press Enter.
  • Your terminal prompt will become #.
  • You now have root privleges on all operations in the terminal window.
  • What is the command for root privilege?

    Which command is run with root privileges in Linux?

    How do I give root privileges to a file in Linux?

    Changing the permissions on a file.OptionMeaningoOthers; change the other permissions3 more rows

    How do I give a user root privileges in Linux without sudo?

    How do I add a user and grant root privileges?

  • Step 1: Add the Username.
  • Step 2: Grant Root Privileges to the User.
  • Step 3: Verify User Has Privileges.
  • How do I give root power to user?

    How do you know if a user is a root user in Linux?

    How do I know if my account is sudo?

    How do I see sudo users in Linux?

  • List All Users. Here is the command to list all users in Linux. $ awk -F’:’ ‘{ print $1}’ /etc/passwd.
  • Find If User Has Sudo Privileges. We have seen how to list all sudo users in our system.
  • How do I find my root username?

    How do I make myself a root user?

    How do I know if a process is running as root?

    How to get root access on Linux operating system?

  • Please click on the lower left corner of the icon (start button).
  • Click Terminal menu item to open the terminal.
  • Input the command below: % sudo su
  • Press Enter.
  • Your terminal prompt will become #.
  • You now have root privleges on all operations in the terminal window.
  • Дополнительно:  Как войти в linux mint как root

    How do you see what privileges a user has in Ubuntu?

    How do I check permissions?

    Bash Check If User Is Root
    Bash Check If User Is Root

    How do I know if user is root or sudo?


    Bash script to check if a specific user is present in etc passwd

    https://youtube.com/watch?v=tQ9VDxCmiKk%3F

    Bash Script To Check If A Specific User Is Present In Etc Passwd
    Bash Script To Check If A Specific User Is Present In Etc Passwd

    How do I find my root username in Linux?

    1. su command – Run a command with substitute user and group ID in Linux.
    2. sudo command – Execute a command as another user on Linux.

    How do you check what permissions a user has in Linux?

    1. ls -l. Then you will see the file’s permissions, like the following: …
    2. chmod o+w section.txt. …
    3. chmod u+x section.txt. …
    4. chmod u-x section.txt. …
    5. chmod 777 section.txt. …
    6. chmod 765 section.txt. …
    7. sudo useradd testuser. …
    8. uid=1007(testuser) gid=1009(testuser) groups=1009(testuser)

    What is root in terminal?


    See some more details on the topic bash check if user is root here


    How do I check if I have root access? – Unix Stack Exchange

    Yes. If you are able to use sudo to run any command (for example passwd to change the root password), you definitely have root access.

    Check the bash shell script is being run by root or not – nixCraft

    Check if user is root/sudo before running a script – The Electric …

    How do I check if a user has root access in Linux? – OS Today

    What is the user ID of root?


    Shell Script Check If Directory Exists – Folder – Linux – BASH – tutorial

    Shell Script Check If Directory Exists – Folder – Linux – BASH – tutorial

    Shell Script Check If Directory Exists – Folder – Linux – BASH – tutorial

    https://youtube.com/watch?v=dqdjNf6Z1-U%3F

    Shell Script  Check If Directory Exists - Folder - Linux - Bash - Tutorial
    Shell Script Check If Directory Exists – Folder – Linux – Bash – Tutorial

    How do I access root?

    In most versions of Android, that goes like this: Head to Settings, tap Security, scroll down to Unknown Sources and toggle the switch to the on position. Now you can install KingoRoot. Then run the app, tap One Click Root, and cross your fingers. If all goes well, your device should be rooted within about 60 seconds.

    How do you check user permissions in Unix?

    To view the permissions for all files in a directory, use the ls command with the -la options. Add other options as desired; for help, see List the files in a directory in Unix. In the output example above, the first character in each line indicates whether the listed object is a file or a directory.

    How do I give a user root access in Linux?

    1. To add a user to root using usermod, we have to run the following command in the terminal. …
    2. To add an existing user to the root group, follow the following command: usermod -g 0 -o user. …
    3. useradd command can be used to create a new user or update default new user information. …
    4. Example:

    What does chmod 777 mean?

    777 – all can read/write/execute (full access). 755 – owner can read/write/execute, group/others can read/execute. 644 – owner can read/write, group/others can read only.

    How do you find if a user has permissions on a particular file?

    Check Permissions in Command-Line with Ls Command

    If you prefer using the command line, you can easily find a file’s permission settings with the ls command, used to list information about files/directories. You can also add the –l option to the command to see the information in the long list format.

    Is a root user in Linux?


    Complete Shell Scripting | Run shell script with root user or with sudo privilage

    https://youtube.com/watch?v=Ot5AjcCSBoQ%3F

    Complete Shell Scripting | Run Shell Script With Root User Or With Sudo Privilage
    Complete Shell Scripting | Run Shell Script With Root User Or With Sudo Privilage

    How do I login as root in terminal?

    Part 1 of 5:

    • linux bash check if user is root
    • bash check if variable is set
    • how to check if user is superuser
    • bash script check if user is root
    • bash root directory
    • bash script run as root
    • bash if
    • check root users
    • bash if else
    • ubuntu check if user is root
    • how to check root user in kali linux
    • bash check if file exists
    • bash check if directory exists

    Table of contents

    How To check user configured with root privileges

    $ sudo -ll
    Matching Defaults entries for user1 on this host:
        env_reset, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin
    User user1 may run the following commands on this host:
    Sudoers entry:
        RunAsUsers: ALL
        RunAsGroups: ALL
        Commands:
        ALL
    

    You may utilize
    sudo -l command
    to verify the permissibility of a specific command. Upon allowance, the complete path will be displayed.

    $ sudo -l ls
    /bin/ls
    

    Check if user is root in C?

    if (i_am_root) do_privileged_op(); else print_error();
    

    It can be helpful to verify if your program was executed as «suid-root» by checking for root access. A practical way to test for this would be:

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    uid_t uid=getuid(), euid=geteuid();
    if (uid<0 || uid!=euid) {
        /* We might have elevated privileges beyond that of the user who invoked
         * the program, due to suid bit. Be very careful about trusting any data! */
    } else {
        /* Anything goes. */
    }
    

    You can either choose
    getuid
    or
    geteuid
    based on your intended meaning. Regardless of your choice, a value of 0 represents the root.

    if(geteuid() != 0)
    {
      // Tell user to run app as root, then exit.
    }
    

    R’s point is valid and it’s worth considering an alternative approach that doesn’t necessarily involve directly accessing the root, such as trial and error.

    It is advisable to utilize either getuid or geteuid functions, which are available in the zconf.h header file. To access these functions, you need to include the header file in your code as shown below:

    #include 
    #include 
    int main()
    {
    int a;
    a=getuid();
    //or you can use  a=geteuid();
    //euid is effective user id and uid is user id 
    // both euid and uid are zero when you are root user 
    if (a==0){
    printf("you are root user");
    //so you can do what`enter code here`ever `enter code here` you want as root user
    }
    else
    printf("please run the script as root user !");
    return 0;
    } 
    

    How can my C/C++ application determine if the root user is executing the command?

    The clear options are either
    getuid
    or
    geteuid
    .

    In
    geteuid
    , the presence of
    e
    signifies
    effective
    and its purpose is to verify the validity of the credentials.

    #include 
    #include 
    int main() { 
        auto me = getuid();
        auto myprivs = geteuid();
        if (me == myprivs)
            std::cout << "Running as self\n";
        else
            std::cout << "Running as somebody else\n";
    }
    
    #include  // getuid
    #include  // printf
    int main()
    {
        if (getuid()) printf("%s", "You are not root!\n");
        else printf("%s", "OK, you are root.\n");
        return 0;
    }
    

    How to get root privileges from process

    The problem can be resolved by feeding the root passphrase directly to the su utility through the use of fd_set or pipes. The system call forkpty can then be utilized to obtain a login shell that is ready to use.

    How can a script check if it’s being run as root?

    I’m writing a simple bash script, but I need it to check whether it’s being run as root or not. I know there’s probably a very simple way to do that, but I have no idea how.

    Just to be clear:

    What’s a simple way to write a script

    foo.sh

    , so that the command

    ./foo.sh

    outputs

    0

    , and the command

    sudo ./foo.sh

    outputs

    1

    ?

    #!/bin/bash
    if [[ $EUID -ne 0 ]]; then
       echo "This script must be run as root" 
       exit 1
    fi
    

    The only reliable program to check whether the account is logged in as root, or not:

    id -u
    
    Tests
    rootx
    root2
    

    Logged in as

    root2

    , gives the next results:


    • whoami

      :

      rootx

    • echo $USER

      :

      root2

      (this returns an empty string if the program was started in an empty environment, e.g.

      env -i sh -c 'echo $USER'

      )

    • id -u

      :

      0

      As you can see, the other programs failed in this check, only

      id -u

      passed.

    The updated script would looks like this:

    #!/bin/bash
    if ! [ $(id -u) = 0 ]; then
       echo "I am not root!"
       exit 1
    fi
    
    #!/bin/bash
    if [[ $EUID -ne 0 ]]; then
       echo "You must be root to do this." 1>&2
       exit 100
    fi
    
    #!/bin/bash
    if (( EUID != 0 )); then
       echo "You must be root to do this." 1>&2
       exit 100
    fi
    
    #!/bin/bash
    if [ `whoami` != 'root' ]
      then
        echo "You must be root to do this."
        exit
    fi
    ...
    

    if [ $USER != 'root' ]
    

    How to know if I have root privileges in Linux Shell terminal

    How to know if I am a root user in Linux

    Linux Command Line (13) The Root User

    Checking for root user in sh and bash [duplicate]

    The problem is, between bash and sh, the environment variables are different:

    • bash -> $EUID (all caps)
    • sh -> $euid (all lower)

    I would check the value of

    id -u

    , which is specified to:

    Perhaps like this:

    if [ $(id -u) -eq 0 ]
    then
      : root
    else
      : not root
    fi
    

    How do I determine if a shell script is running with root permissions?

    I’ve got a script I want to require be run with su privileges, but the interesting scripted command that will fail comes very late in the script, so I’d like a clean test up front to determine if the scrip will fail without SU capabilities.

    What is a good way to do this for bash, sh, and/or csh?

    #!/usr/bin/env bash
    # (Use #!/bin/sh for sh)
    if [ `id -u` = 0 ] ; then
            echo "I AM ROOT, HEAR ME ROAR"
    fi
    
    #!/bin/csh
    if ( `id -u` == "0" ) then
            echo "I AM ROOT, HEAR ME ROAR"
    endif
    

    You might add something like that at the beginning of your script:

    #!/bin/sh
    ROOTUID="0"
    if [ "$(id -u)" -ne "$ROOTUID" ] ; then
        echo "This script must be executed with root privileges."
        exit 1
    fi
    

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