How to execute commands from within a bash script. We can run commands easily using shell_exec()function.We can also run using exec().. From StackOverflow: shell_exec returns all of the output streams as a string.exec returns the last line of the output by default, but can provide all output as an array specified as the second parameter. The usage of su implies the knowledge of the "other" user password except if invoked by root. This very short guide will show you how to make a shell (.sh) script executable on your Raspberry Pi. I did a workaround to wait a second so the echoed password could be filled in, and then second sudo should be able, to run sudo su - foobar: ... Unix & Linux: How can I execute some commands in a shell script with `sudo` and others not? – baumgart May 22 '12 at 15:39 I am running the script locally but need to access an external machine via ssh, as well as sudo into a privileged user once on that machine... ssh myuser@machine.net sudo su - privledged_user cat logs > file.txt Running this with sh -x reveals bash is getting stuck on the 'ssh' line. Running sudo su - and then typing the user password has the same effect the same as running su - and typing the root password.. In most cases running a single command with sudo is sufficient. Secure Shell includes a lot of tricks, many of which can make your admin's life exponentially easier. This tutorial help to execute shell/window command into nodejs application.The Node.js is providing a module child_process.exec which is specifically designed for executing shell scripts into nodejs application.. Also, the Sudo command is mostly used when trying to install, launch … Enter the administrator password (in plain text) ... Don't run sudo from applescript's do shell script command. sudo (Super User DO) command in Linux is generally used as a prefix of some command that only superuser are allowed to run.If you prefix “sudo” with any command, it will run that command with elevated privileges or in other words allow a user with proper permissions to execute a command as another user, such as the superuser. Torn, when you said you want to run a bash script at login I took it you knew how to use the shell and knew that scripts are not applciations which you can simply define as login items in the Accounts preferences. There are two ways of achieving this withsudo: When you run sudo -s it will invoke a new shell, running as root. Now that we know what types of commands are available, we can expand into how to use them in your scripts. When used with the -i option, sudo run an interactive login shell with the root user’s environment: The sudo command allows trusted users to run programs as another user, by default the root user. If you've ever tried running a shell script, only to get a command not found error, it probably means your shell script isn't executable: sudo ./install.sh. The problem you're seeing is because you're using the command sudo su. Simple commands are defined in the bash man pages as a word followed by optional arguments. Run the 'Sudo -s' command. I want the user named sk to execute mkdir command without giving the sudo password. HOWEVER - configuring sudo to allow a user to run su allows them to become any user. I thought my explaination of sudo was pretty clear if you wanted to use sudo without it requesting a password (using the -S or -A) options. root Shells. The sudo command allows you to run programs as another user, by default the root user.. Running Command As Another User with Su. Depending on how they are invoked the environment variables can change, causing different command results. Examples: Below are some examples of how to run and use the su on Ubuntu Linux…. To run a script as root from a script running as a user using sudo without a password: visudo and add a line at the bottom: user ALL=(root) NOPASSWD: /path/to/root/script.sh Then inside the user script: sudo /path/to/root/script.sh Only "user" can run script.sh without a password with sudo. 3. By Using a Bash Script. Tag Description-b The -b (background) option tells sudo to run the given command in the background. su allows to run commands with a substitute user and group ID. Additionally,su can also be used to change to a different shell interpreter on the fly. Simply run the su command to invoke it…. To run as another user for a prolonged period of time, use the su command. So the master shell executes the sudo, waits for it to exit, before it proceeds with the other commands (ls and cd).And the sudo does not exit (at least not on its own).. You could even run sudo, and point it to another shell script that contains all of the commands you need it to run, so you could make that script stay somewhat compact. Let's name it "myscript.sh". By default, the su command takes an input a target username to switch into. By default, Linux restricts access to certain parts of the system preventing sensitive files from being compromised. There is yet another way to run sudo with redirect or pipe, and it is by creating a bash script with all your commands, and run that script with sudo. I have tried putting following commands in a shell script sudo su - user2 -c "sudo cmd1" (this prompts me for a password though I have a sudo rule to not prompt for one.) Both "su" and "sudo" allow to execute commands on behalf of other user. What you want is really a login shell, which would mean that the profile files are executed. su and sudo allow to execute commands or shell with a different user. It seems like the second command "su " is to fast after prompting password query. To run multiple commands sudo we used the following options:--: A --signals the end of options and disables further option processing for sudo command.sh -c : Run sh shell with given commands ; bash -c : Same as above. Note that if you use the -b option you cannot use shell job control to manipulate the process.-E The -E (preserve environment) option will override the env_reset option in sudoers(5)).It is only available when either the matching command has the SETENV tag or the setenv option is set in sudoers… Then [su commands] will be executed (with your user account) and finally exit ends the script. su. When called without arguments, su defaults to running an interactive shell as root. I would suggest creating a script for your command, setting the script permissions to 700 and owned by root, then configuring sudo to allow a user to run that single script. Today we are going to see how to run Linux server commands as root using PHP script. Usually, to grant sudo access to a user you need to add the user to the sudo group defined in the sudoers file.On Debian, Ubuntu and their derivatives, members of the group sudo are … sudo su - user2 (this gets me out of the shell and takes me to "user2@host]") none works for me. In context, a simple command may be either a builtin, external command, or function. sudo cat /etc/sudoers How to provide password directly to the sudo su – in shell scripting for IBM AIX servers. You could also put "export HISTIGNORE='sudo -S'" in your ~/.bashrc file, then load it with ". The su command lets you switch the current user to any other user. The sudo command allows a permitted user to run a command as the superuser (root) or another user as set by the security policy of the system. sudo is a powerful command-line tool that enables a “permitted user” to run a command as another user (the superuser by default), as defined by a security policy. If you run the su command but don’t specify a login name, the command automatically switches to the superuser or root and run its interactive shell….