{"id":163,"date":"2024-02-17T19:02:25","date_gmt":"2024-02-17T19:02:25","guid":{"rendered":"https:\/\/feellikelearning.com\/en\/?p=163"},"modified":"2024-02-17T19:02:25","modified_gmt":"2024-02-17T19:02:25","slug":"how-to-start-ssh-agent-on-ubuntu","status":"publish","type":"post","link":"https:\/\/feellikelearning.com\/en\/index.php\/2024\/02\/17\/how-to-start-ssh-agent-on-ubuntu\/","title":{"rendered":"How to start ssh-agent on Ubuntu"},"content":{"rendered":"\n

On Ubuntu, we can use this command<\/p>\n\n\n\n

eval $(ssh-agent -s)<\/code><\/pre>\n\n\n\n
It will output something like<\/p>\n\n\n\n
Agent pid 2499xxx<\/code><\/pre>\n\n\n\n
After this, we can use ssh-add<\/p>\n\n\n\n
ssh-add <path to the private key><\/code><\/pre>\n\n\n\n
Explain “eval $(ssh-agent -s)”<\/h2>\n\n\n\n
The command eval $(ssh-agent -s)<\/code> is a convenient way to start the SSH agent and set up the necessary environment variables in the current shell session. Here’s a breakdown of what each part of the command does:<\/p>\n\n\n\n
    \n
  1. ssh-agent -s<\/code><\/strong>: This command starts the SSH agent in the background and outputs shell commands to set up the environment variables that point to the newly created SSH agent. The -s<\/code> option instructs ssh-agent<\/code> to output commands suitable for use in a shell script.<\/li>\n\n\n\n
  2. $(...)<\/code><\/strong>: This is called command substitution. It allows the output of a command (ssh-agent -s<\/code>) to be substituted in place as part of another command. Whatever is inside $(...)<\/code> is executed, and its output is treated as if it were written directly into the command line.<\/li>\n\n\n\n
  3. eval<\/code><\/strong>: This is a shell built-in command that evaluates the arguments as a shell command. It basically causes the shell to re-parse and execute the command line generated by the command substitution $(ssh-agent -s)<\/code>.<\/li>\n<\/ol>\n\n\n\n
    So, when you run eval $(ssh-agent -s)<\/code>, the ssh-agent -s<\/code> command starts the SSH agent and outputs shell commands to set up the environment variables, and then eval<\/code> evaluates and executes those commands in the current shell session. This effectively starts the SSH agent and sets up the environment variables so that subsequent SSH-related commands know how to communicate with the SSH agent.<\/p>\n","protected":false},"excerpt":{"rendered":"
    On Ubuntu, we can use this command It will output something like After this, we can use ssh-add Explain “eval $(ssh-agent -s)” The command eval $(ssh-agent -s) is a convenient way to start the SSH agent and set up the necessary environment variables in the current shell session. Here’s a breakdown of what each part […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-163","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow to start ssh-agent on Ubuntu - Feel Like Learning<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/feellikelearning.com\/en\/index.php\/2024\/02\/17\/how-to-start-ssh-agent-on-ubuntu\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to start ssh-agent on Ubuntu - Feel Like Learning\" \/>\n<meta property=\"og:description\" content=\"On Ubuntu, we can use this command It will output something like After this, we can use ssh-add Explain “eval $(ssh-agent -s)” The command eval $(ssh-agent -s) is a convenient way to start the SSH agent and set up the necessary environment variables in the current shell session. 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