Use. Why is bleaching with Chlorine permanent but with Sulphur Dioxide temporary? Then, su command will ask for annie‘s password. This site contains user submitted content, comments and opinions and is for informational purposes only. From the research that I have done it seems that I was assuming sudo was configured to be passwordless for your remote account. There's a few ways to do this. or. sudo bash can't execute script. For instance, if a user runs the script, it should say that this script must be run with sudo privileges, and then quit. sudo npm start and I am trying to create a bash script that will launch this for me. I give a walkthrough of a bash script that installs all of the R packages required by an R program (e.g., Shiny app, R file, R markdown file). By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Looks like no one’s replied in a while. Therefore, in this guide, we will describe how to configure sudo command to run without entering a password.. The root user is basically equivalent to the administrator user on Windows – the root user has maximum permissions and can do anything to the system. Fixing your Script. Less, User profile for user: Then [su commands] will be executed (with your user account) and finally exit ends the script. 2. I haven't been able to find a question that describes this specific scenario. sudo Command in Bash Script It is very important for a Linux user to understand these two to increase security and prevent unexpected things that a … I have tried a few variations: su myname -c "npm run start" sudo su myname -c "npm run start" su myname -c "sudo npm start" but they all seem to execute the command without superuser rights. So the master shell executes the sudo, waits for it to exit, before it proceeds with the other commands (ls and cd). Why might radios not be effective in a post-apocalyptic world? First one is to start a new shell with sudo and pass the command to it using -c option. After connection, you will be able to transfer files from the directory where you normally need sudo permission to access. rev 2021.3.12.38768, The best answers are voted up and rise to the top, Server Fault works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. I've placed the practice script in my login options for my user account on my computer so when I reboot it runs, but does not complete because it's asking for a password. 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. Are there examples of finite-dimensional complex non-semisimple non-commutative symmetric Frobenius algebras? This might work too (assuming SUDO_ASKPASS has been previously exported): SUDO_ASKPASS=/usr/local/bin/pw sudo -A command, ------------------------------------------------, Method 2: Have sudo read the password from stdin. However, we can specify a script to be run with the flag -c. When specified, su command will just execute the script without dropping into a new shell as the target user. So I tried revising it to this: This also seems to stall indefinitely. Here's two (pick the method you like): With this you always do sudo -A command. As mentioned before, the recommended way of gaining super user privileges from the command line in macOS is the sudo command. And the sudo does not exit (at least not on its own). sudo -A can get the pathname to pw a number of ways. I have written a script to automate a software install. Method 1: Using sudo inside the file #!/bin/bash sudo echo "I must be run by root" touch needsToBeOwnedByUser1 echo "needs to be run by user" sleep 1000 sudo echo "I, again, must be run by root" This would look good, from the way the code is written. What is the difference between double and single square brackets in bash? Torn-Barb, User profile for user: Depending upon the total accounts, it will take time to finish script. Using the SUDO_ASKPASS environment variable. How to use ssh and sudo together in bash? Linc Davis, Jul 24, 2011 5:24 PM in response to Torn-Barb, Jul 24, 2011 6:15 PM in response to Linc Davis. Whenever I do the shell script su's to the user properly but the scripts stops executing until I exit out of the new shell that su put me into. gives username the right to run the script with sudo, as in $ sudo /path/to/script If you want the user to be able to restart tor specifically, with sudo in the script, use. Data. For this explaination let's call the command pw and stick it /usr/local/bin. I've been playing with an example bash script like so: sudo ipfw add deny ip from 192.x.x.x/24 to 10.x.x.x. Asking for help, clarification, or responding to other answers. 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... Running this with sh -x reveals bash is getting stuck on the 'ssh' line. This is usually the super user (aka root), thus the command - su "do" (su = Substitute User Identity) The key to remember is that when you issue a command prefixed with sudo you are running it as root and not as "you." 2. I am running the script as root, but need to su to another user to configure and complile the program properly. if you want you can disable "RequireTty" in /etc/sudoers on the remote end. $ sudo pip install gevent Collecting gevent... You will be prompted for UAC acception (if enabled) and then a new session will be spawned as a sub-shell. ; The sudo password and the cifs password are identical. You would use a root launchd item for that purpose, not sudo. Server Fault is a question and answer site for system and network administrators. Check Sudo Secure Path. The only relatively secure scheme of these two methods is the askpass (-A) method. $ sudo ls /root > /root/ls.out -bash: /root/ls.out: Permission denied $ There are a few alternative ways to perform this. And dropping 'sudo su' in the middle of your script as you are doing doesn't work -- assuming you were trying to get the rest of the script to run with root authority or other-user authority. Here are some tips... Run the script itself (not the individual commands) with sudo. sudo bash & sudo sh: Anything after the sudo is a program to run - so in these cases you are asking to run a couple of shells - bash and dash respectively. MacBook How can I draw the trefoil knot in 3D co-ordinates in Latex using these parametric equations? More How To Use ‘Sudo’ And ‘Su’ Commands In Linux : An Introduction Today We’re going to discuss sudo and su, the very important and mostly used commands in Linux. instead. In fact, Sudo stands for “Super User Do,” and it logs all arguments. Use 'sudo', not 'sudo su'. That's why sudo isn't included in the list of common attack vectors for Shellshock. It only takes a minute to sign up. How do I get the current Unix time in milliseconds in Bash? I've been working with bash for not more than 6 hours, and now I'm trying to create a menu that allows you to do some "fun" stuff :D. My problem is with the if statement that check if you're in sudo mode. user2@host] sudo cmd1. At least with that method you have a chance of encrypting/hiding your password down in the command that echoes it to stdout. You realize I've been trying to figure this out for about 5hrs now, I'm still working on it. Jul 24, 2011 4:57 PM in response to X423424X But if you really want to do this as a at startup, as a script, then you can create launchagents or startupitems. This means that login-specific resource files such as .profile, .bashrc or .login will be read and executed by the shell. #!/bin/bash if [ `id -nu` != diy ]; then sudo -u diy $0 # Re-run this script as user diy else # Everything you want to do goes here fi Keep in mind that /etc/sudoers must be set up to allow the original user to run this script as the new user. Is US Congressional spending “borrowing” money in the name of the public? This question is on topic: Unfortunately because I don't manage the remote server, I. yes it will work too. use man bash and man sh … It is, which caused me to reason that bash isn't honoring the ssh command for some reason. Making statements based on opinion; back them up with references or personal experience. I've tried: ssh -t mrhyner@stg-app3.indeed.net << EOF sudo su - adcentrl egrep 'ERROR\|WARN' /home/adcentrl/cronjobs/logs/*/* EOF But I received: "Pseudo-terminal will not be allocated because stdin is not a terminal. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. user1 has sudo rule to su - user2 (NO PASSWORD) and user2 has will be able to sudo certain commands. sudo su should open a root shell for you and the script should not advance until you leave it. Is there a better solution to this problem?? I'd also recommend putting the sudo as "deep" as possible: right on the systemctl command. Alright, I'm lost, sorry I've tried to educate myself on how to do this, but I'm at a loss now. See the man pages for launchd and launchd.plist. At least with that method you have a chance of encrypting/hiding your password down in the command that echoes it to stdout. Use su – command as follows: $ su - When prompted you need to type the root user’s password. 'apt-get update && sudo apt-get -y upgrade': First update repo and apply upgrades if update was successful. Also, the Sudo command is mostly used when trying to install, launch and exit an application that requires root user privilege. The only relatively secure scheme of these two methods is the askpass (-A) method. 2. State of the Stack: a new quarterly update on community and product, Podcast 320: Covid vaccine websites are frustrating. Step #2: Install sudo tool under Linux. The name means ‘super user do’ and will perform the following command with root privileges after verifying the user running sudo has the permission to do so.. Part 1: Demystifying root; Part 2: The sudo Command (this post); Part 3: root and Scripting 2. pdsh works well standalone, but doesn't work in script. how to run "sudo su" inside bash script. Consider adding whoami at several positions to the script to see who is the active user at different points in the script. I like to fully understand what I'm doing before I do it. user1@host] sudo su - user2. Otherwise, here is a way to pass the remote user's password to sudo: Thanks for contributing an answer to Server Fault! Very interesting. That command is something you write. If users are allowed to sudo an arbitrary command (which they should be able to, if they can sudo su), then we can make the function invoke it like this: sudo -u lx -- supervisor "$@" That seems cleaner than creating a shell and funnelling arguments through it. Understanding sudo command options. so following works fine from command prompt. I want operator users on this machine to mount their own cifs shares; The sudoers file already contains the /bin/mount -t cifs //*/* /media/* -o username=* command for all operators; I want the users to mount a cifs share through a script typing the password only once, not twice. While you want the ls and cd to execute within a child shell executed by the su. I've tried several variances to what you suggested, but I don't think I'm fully understanding the concept. To do something that requires these permissions, you’ll have to acquire them with su or sudo. So we added sudo su -c /usr/libexec/openssh/sftp-server in settings here. This developer built a…. In response to X423424X. 0. However using ssh without -t tells me "no tty present". That’s it! What are the bounds of the enforced value of "legal tender"? You proably should read the Apple doc "About Daemons and Services" to get you started. the above command opens up a new shell, logging me in as user2. – Tim Sep 30 '13 at 16:23 Last edited by Trilby (2013-06-26 17:59:18) There is a reason bash functions are not allowed to be 'sudo'ed - and running sudo on a function that includes a sleep command seem particularly bad to me. you can enter the password when prompted. I basically want to make a script that will allow me to run 1 command to update all my servers (sudo yum update on the Centos machines; sudo apt-get update && apt-get upgrade on the ubuntu machine) But I'm not sure how to write the script so that I can enter the password at the beginning 1 time and have it do all the servers. How can I do a check in the script so that it can only be run as root (or with sudo)? If you really must invoke sudo from within the script, then we can simplify a bit. Jul 24, 2011 6:15 PM in response to Linc Davis 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. The -S option tells sudo to read the password from stdin so echo pipes it in (without the ending newline). In response to X423424X. Done … Why would a Cloaking Device be a technology the Federation could not have developed on its own? In case you are running Linux on a machine that you normally use alone, say on a laptop, entering a password each time you invoke sudo can become so boring in the long run. If you're not very familiar with the shell, this isn't a good way to learn. The way I achieve this in my current environment, is to run ssh with the -t flag which forces tty allocation, and to then run sudo -u root within it, as follows: I have my account in sudoers on the remote side so that no password is required. It's acting like I'm trying to sudo from my local host =\. So I created a simple bash script to run on login..... One thing I haven't learned in my years of Unix is how do you get a bash script to run a sudo command without having to enter a password? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. X423424X, Jul 24, 2011 1:21 AM in response to Torn-Barb, Jul 24, 2011 3:25 PM in response to X423424X, Jul 24, 2011 4:57 PM in response to X423424X, User profile for user: Jul 24, 2011 5:24 PM in response to Torn-Barb Pro, Use visudo to add the following line to the sudoers file: Defaults:ALL askpass=/usr/local/bin/pw. 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. Run bash with sudo/su however you do it and pass commands through input: This is useful for speeding up the workflow of adding a new Shiny app to a server. Both su and sudo are used to run commands with root permissions. Normal users on Linux run with reduced permissions – for example, they can’t install software or write to system directories. arXiv article says that code has been made available with the article, but I cannot find it. The bash script given below will list all the mail accounts in a cpanel server and the list is saved in '/root/mailaccounts.txt'. ", perfectly okay. Because it installs programs and I have bash-script that uses sudo commands, but in the middle I need to stop sudo-influence and then later reinstate it. To start the conversation again, simply ask a new question. Run a bash script with sudo, nohup and in the background This command will run script.sh under super user and you can disconnect and come back later: sudo nohup bash script.sh & It’s useful if you don’t have Screen or you want the process to close when it … In our example, we use the su command to execute the annie-script.sh with user annie. Any ideas or directions to lead me down the right rabbit hole? Sudo works for a brief period of time. Mac OS X (10.7), Jul 24, 2011 1:21 AM in response to Torn-Barb Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Why the close vote ? Protect root-owned script against tampering and run unattended w/ sudoers' NOPASSWD. 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. sudo -k first-command-with-sudo sudo second-command sudo third and so on This script will prompt for password at least once regardless of any previous sudo command/s or session. Code: sudo -u user sh -c '/usr/bin/nohup /home/user/somescript.sh &'. Sudo is a powerful Linux command-line tool that grants a Linux user access to run commands as another user. With this one, sudo starts the sh shell, which in turn starts the script in the background thorough nohup. This example shows you different ways to do this within a single ssh session, including running multiple commands with bash or within a subshell. Should we ask ambiguous questions on an exam? Simple answer -- don't do that. Sudo blocks environment variables that might be bash function definitions (2004-11-11 env.c: strip exported bash functions from the environment), even if the variable name is whitelisted. $ sudo visudo Attention: This method has serious security implications especially on servers running on the Internet.This way, we risk exposing our systems to various attacks, because an attacker who manages … What could a getaway driver be charged with? ssh myuser@machine.net "sudo su - privileged_user -c 'cat logs > file.txt'". 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. Adding in -t removes this error but doesn't seem to honor 'sudo su' as it prompts me for a password. To run as another user for a prolonged period of time, use the su command. Prompt for sudo password and programmatically elevate privilege in , I'm currently working on a bash script that installs and sets up various programs on a stock Linux system (currently, Ubuntu). All postings and use of the content on this site are subject to the. In response to Torn-Barb. Note also that if you put the above code into an executable script, you can pass command line arguments ($1 and $2) to ssh and these will be expanded and then referenced on the remote side. I know this is trival, but just a quick 'this is how you do it' would be cool. Run a s script as root without sudo? 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. I'm trying to write a bash script (in Ubuntu) that will backup a directory using tar. To fix this, we need to add the directory containing our scripts in the sudo secure_path by using the visudo command by editing /etc/sudoers file as follows. Automatically stretching non-default arrows in tikz-cd. Now click Ok and connect to the server as you normally do. Term to describe paradox where those with less subject matter expertise can sometimes make better teachers? I want to have 3 conditions: If I execute the script with sudo mode, I'll … The sudo command runs any command as another user account and is commonly used to elevate permissions so that the command is run with elevated security privileges (which in Linux terms is known as the root user). The -Soption tells sudo to read the password from stdin so echopipes it in (without the ending newline). Supports some sudo options: b,E,e,H,h,i,n,u should act approximately the same way as with sudo-l always acts as if the user can run any command; K,k,p,U,V,v are ignored; A,C,g,L,P,r,S,s,t aren't implemented, nosudo exists if it encounters them depending on whether you want file.txt file be created locally or … To start the conversation again, simply ask a new question. You can use `-s` option. The -A argument tells sudo to execute a command that echos the password to stdout. I'm betting sudo bash instead of sudo is specified to. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums. A bash script invoked by su to a Stigma of virginity and chastity loophole. nosudo is a simple bash script that mimics some of sudo's features. absolutely ensure you are invoking ./gitpull.sh from bash and not another shell such as tcsh, pdksh or plain old sh.I'm pretty sure the script's hashbang line should allow the script to specify what shell to run it under but maybe it was omitted for some reason or the instruction writer doesn't want you to rely on that. In response to Linc Davis. Using bash commands in expect script. run sudo with the -l or -v flags Example with the su command $ sudo -l su [sudo] password for gerard: /bin/su If a user who is not listed in the sudoers file tries to run a command via sudo without the -l or -v flags, mail is sent to the proper authorities, as defined at … How to determine if a bash variable is empty? 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. username ALL=(ALL) NOPASSWD: /usr/sbin/service tor restart Now the script may do. How to run a command multiple times, using bash shell? Automating SSH login gives unresponsive remote-shell, dropping back to client-terminal (without errors) 1. Best way to run remote SSH command requiring root, but not as root, any way to run sudo before all commands automatically(well, sort of…read on), Run bash script as sudo from windows without interaction. Recommendations for OR video channels (YouTube etc). ignore that warning and proceed. If you don't want or can't stop sudo from asking you the password, one simple trick is to read it locally and store it in a local variable: If sudo is configured to allow passwordless commands, this should do what you want: depending on whether you want file.txt file be created locally or remotely. You logged to server using WinSCP and sudo access. On most if not all Linux systems, the security policy is driven by the /etc/sudoers file. Why is non-relativistic quantum mechanics used in nuclear physics? Here's specifically what I'm doing: ssh -t mrhyner@test-server.net "sudo su - adcentrl -c egrep "ERROR\|WARN" /home/adcentrl/cronjobs/logs/*/*" This gives me: bash: WARN: command not found [sudo] password for mrhyner: Sorry, I apparently don't know how to format my comments in this thing. To learn more, see our tips on writing great answers. Features. It will run the sudo command in the background, instead of the script. In response to Torn-Barb. So it's full pathname would be /usr/local/bin/pw. Q: sudo command accepts path to program and then argument list. You have to tell the su to execute the commands. I am trying to execute a very basic bash script to retrieve logging from multiple machines. Question: sudo -u user /usr/bin/nohup sh /home/user/somescript.sh &. Well I did and I’ll explain why and how in this little blog post. Thanks ahead of time on this really dumb question. If sudo is configured to allow passwordless commands, this should do what you want: ssh myuser@machine.net "sudo su - privileged_user -c 'cat logs'" > file.txt. The -S method would contain your password explicitly in a script somewhere unless you make other provisions to encrypt/hide it with that technique. Jul 24, 2011 3:25 PM in response to X423424X user2@host] sudo cmd2. hi, i have a requirement where i need to sudo to another user in the shell script.suppose consider user A and B, first user A calls a shell script and then i need to sudo to user B which executes another shell script inside the earlier one. sudo -i It is nearly the same as sudo su - The -i (simulate initial login) option runs the shell specified by the password database entry of the target user as a login shell. browning meat in Dutch oven--why doesn't it work for me?