{"id":68030,"date":"2023-07-11T18:01:39","date_gmt":"2023-07-11T10:01:39","guid":{"rendered":"https:\/\/www.hongkiat.com\/blog\/?p=68030"},"modified":"2023-07-28T19:29:50","modified_gmt":"2023-07-28T11:29:50","slug":"linux-command-sudo","status":"publish","type":"post","link":"https:\/\/www.hongkiat.com\/blog\/linux-command-sudo\/","title":{"rendered":"How to Use sudo in Linux"},"content":{"rendered":"

The sudo<\/code> command in Linux stands for \u201cSuperUser DO\u201d. It\u2019s a powerful command that allows users to run programs or other commands with the security privileges of another user, typically the \u201csuperuser\u201d. This can be particularly useful when certain operations require higher-level permissions than those granted to standard user accounts.<\/p>\n

The superuser, also known as the root user in Linux, has the highest level of access to the system, being able to read, write, and modify any file. However, running commands as a superuser can potentially be risky as it could inadvertently lead to system-wide changes or data loss if a command is misused or a mistake is made.<\/p>\n

So, to protect the system, most Linux distributions<\/a> restrict direct access to the superuser account. That\u2019s where sudo<\/code> comes into play. It serves as a gatekeeper, allowing authorized users to execute sensitive operations or modify system settings while logging all commands and their respective outcomes. This can be useful for system audits and to identify how certain changes were made.<\/p>\n

When you type sudo<\/code> before a command, the system checks a special file called the sudoers file to see if the user has permission to run the command as a superuser. If they do, they might be prompted to enter their password (depending on the system settings). After authentication, the system will execute the command with superuser privileges.<\/p>\n

Here are some ways to use the sudo<\/code> command:<\/p>\n

1. Run Command as Root<\/h3>\n

The basic usage of sudo<\/code> is to run a command as the root user.<\/p>\n

Example:<\/strong><\/p>\n

To run the ls<\/code> command as root, you would use:<\/p>\n

sudo ls<\/pre>\n
2. Switch to Root User<\/h3>\n
You can switch to the root user using sudo su<\/code>. This will prompt you for your password, not the root password.<\/p>\n
sudo su<\/pre>\n
3. Run Command as a Different User<\/h3>\n
You can use sudo<\/code> to run a command as a different user using the -u<\/code> option followed by the username.<\/p>\n
Example:<\/strong><\/p>\n
To run ls<\/code> as user john<\/code>, you would use:<\/p>\n
sudo -u john ls<\/pre>\n
4. Edit Files as Root<\/h3>\n
You can use sudo<\/code> to edit files as the root user.<\/p>\n
Example:<\/strong><\/p>\n
To edit the \/etc\/hosts<\/code> file using nano<\/code> as the root user, you would use:<\/p>\n
sudo nano \/etc\/hosts<\/pre>\n
5. Run a Command without a Password<\/h3>\n
You can configure sudo<\/code> to run specific commands without a password by adding a line to the sudoers file (use sudo visudo<\/code> to edit this file).<\/p>\n
Example:<\/strong><\/p>\n
To allow all users to run ls<\/code> without a password, you would add:<\/p>\n
ALL ALL = NOPASSWD: \/bin\/ls<\/pre>\n
6. Update sudo Cached Credentials<\/h3>\n
By default, sudo<\/code> caches your password for 15 minutes. If you want to update the cached credentials before they expire (for example, if you\u2019re about to leave your computer), you can use sudo -v<\/code>.<\/p>\n
sudo -v<\/pre>\n
7. Invalidate sudo Cached Credentials<\/h3>\n
If you want to manually invalidate sudo's<\/code> cached credentials (for example, if you\u2019re done performing administrative tasks), you can use sudo -k<\/code>.<\/p>\n
sudo -k<\/pre>\n
More Linux commands:<\/h3>\n\n\n\n\n\n\n\n\n\n
Directory Operations<\/td>\nrmdir<\/code><\/a> \u00b7 cd<\/code><\/a> \u00b7 pwd<\/code><\/a> \u00b7 exa<\/code><\/a> \u00b7 ls<\/code><\/a><\/td>\n<\/tr>\n
File Operations<\/td>\ncat<\/code><\/a> \u00b7 cp<\/code><\/a> \u00b7 dd<\/code><\/a> \u00b7 less<\/code><\/a> \u00b7 touch<\/code><\/a> \u00b7 ln<\/code><\/a> \u00b7 rename<\/code><\/a> \u00b7 more<\/code><\/a> \u00b7 head<\/code><\/a><\/td>\n<\/tr>\n
File System Operations<\/td>\nchown<\/code><\/a> \u00b7 mkfs<\/code><\/a> \u00b7 locate<\/code><\/a><\/td>\n<\/tr>\n
Networking<\/td>\nping<\/code><\/a> \u00b7 curl<\/code><\/a> \u00b7 wget<\/code><\/a> \u00b7 iptables<\/code><\/a> \u00b7 mtr<\/code><\/a><\/td>\n<\/tr>\n
Search and Text Processing<\/td>\nfind<\/code><\/a> \u00b7 grep<\/code><\/a> \u00b7 sed<\/code><\/a> \u00b7 whatis<\/code><\/a> \u00b7 ripgrep<\/code><\/a> \u00b7 fd<\/code><\/a> \u00b7 tldr<\/code><\/a><\/td>\n<\/tr>\n
System Information and Management<\/td>\nenv<\/code><\/a> \u00b7 history<\/code><\/a> \u00b7 top<\/code><\/a> \u00b7 who<\/code><\/a> \u00b7 htop<\/code><\/a> \u00b7 glances<\/code><\/a> \u00b7 lsof<\/code><\/a><\/td>\n<\/tr>\n
User and Session Management<\/td>\nscreen<\/code><\/a> \u00b7 su<\/code><\/a> \u00b7 sudo<\/code><\/a> \u00b7 open<\/code><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"
Master the sudo command in Linux for secure, superuser access and system modifications.<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3397],"tags":[888,3316],"topic":[],"class_list":["entry-content","is-maxi"],"acf":[],"yoast_head":"\nHow to Use sudo in Linux - Hongkiat<\/title>\n<meta name=\"description\" content=\"Master the sudo command in Linux for secure, superuser access and system modifications.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.hongkiat.com\/blog\/linux-command-sudo\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Use sudo in Linux\" \/>\n<meta property=\"og:description\" content=\"Master the sudo command in Linux for secure, superuser access and system modifications.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.hongkiat.com\/blog\/linux-command-sudo\/\" \/>\n<meta property=\"og:site_name\" content=\"Hongkiat\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/hongkiatcom\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-11T10:01:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-28T11:29:50+00:00\" \/>\n<meta name=\"author\" content=\"Hongkiat.com\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@hongkiat\" \/>\n<meta name=\"twitter:site\" content=\"@hongkiat\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Hongkiat.com\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.hongkiat.com\\\/blog\\\/linux-command-sudo\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.hongkiat.com\\\/blog\\\/linux-command-sudo\\\/\"},\"author\":{\"name\":\"Hongkiat.com\",\"@id\":\"https:\\\/\\\/www.hongkiat.com\\\/blog\\\/#\\\/schema\\\/person\\\/7cc686597d92f9086729e4bcc1577ba3\"},\"headline\":\"How to Use sudo in Linux\",\"datePublished\":\"2023-07-11T10:01:39+00:00\",\"dateModified\":\"2023-07-28T11:29:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.hongkiat.com\\\/blog\\\/linux-command-sudo\\\/\"},\"wordCount\":455,\"publisher\":{\"@id\":\"https:\\\/\\\/www.hongkiat.com\\\/blog\\\/#organization\"},\"keywords\":[\"Linux\",\"Linux Commands\"],\"articleSection\":[\"Desktop\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.hongkiat.com\\\/blog\\\/linux-command-sudo\\\/\",\"url\":\"https:\\\/\\\/www.hongkiat.com\\\/blog\\\/linux-command-sudo\\\/\",\"name\":\"How to Use sudo in Linux - 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