Nov 07, 2007 Mac OS X - Force Ejecting a CD. Restart your computer, and hold down the mouse button. If you have a 2 button mouse, hold down the left click. If your computer has an eject key on the keyboard, restart the computer again, this time holding the eject key. Open a Terminal window and type in drutil tray eject. The OS X Terminal is a very powerful tool for configuring and using a Mac, and can be used to script and program a number of aspects of the computer's operations; however, its text-based interface.
Run the last command again. Commands marked. are bash built-in commands. Bash is the default shell, it runs under Darwin the open source core of macOS. MacOS Man Pages - Apple Developer Connection. Discussion forum. Links to other Sites, Books etc. “Mac OS X is a rock-solid system that's beautifully designed. . The command line can trigger the disk eject mechanism on Macs that are equipped with SuperDrives and DVD drives. This often works to forcibly push out a stuck CD or DVD from the drive. To do this, launch the Terminal and type following command: drutil eject. If the drive is working, you will hear the eject mechanism.
How do I get the name of the active user via the command line in OS X?
Lawrence JohnstonLawrence Johnston11 Answers
as 'whoami' has been obsoleted, it's probably more forward compatible to use:
kentkentIf you'd like to display the full name (instead of the username), add the -F flag:
EDIT
The whoami utility has been obsoleted by the id(1) utility, and is equivalent to id -un. The command id -p is suggested for normal interactive use.
Via here
Checking the owner of /dev/console seems to work well.
stat -f '%Su' /dev/console
I'm pretty sure the terminal in OS X is just like unix, so the command would be:
I don't have a mac on me at the moment so someone correct me if I'm wrong.
dfaIf you want to know who's currently logged in to the system:
(This is from a Linux system; the formatting on OS X may be slightly different, but the information should be about the same.)
There may be multiple login sessions; UNIX is designed to be a multi-user system, after all.
ephemientephemientThe question has not been completely answered, IMHO. I will try to explain: I have a crontab entry that schedules a bash shell command procedure, that in turn does some cleanup of my files; and, when done, sends a notification to me using the OS X notification center (with the command osascript -e 'display notification ..). If someone (e.g. my wife or my daughter) switches the current user of the computer to her, leaving me in the background, the cron script fails when sending the notification.
So, Who is the current user means Has some other people become the effective user leaving me in the background? Do stat -f '%Su' /dev/console returns the current active user name?
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The answer is yes; so, now my crontab shell script has been modified in the following way:
getting username in MAC terminal is easy..
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I generally use whoami in terminal..
For example, in this case, I needed that to install Tomcat Server..
AlirezaAlirezaYou can also use the logname command from the BSD General Commands Manual under Linux or MacOS to see the username of the user currently logged in, even if the user is performing a sudo operation. This is useful, for instance, when modifying a user's crontab while installing a system-wide package with sudo: crontab -u $(logname)
Per man logname:
Define 'active user'.
If the question is 'who is the logged in user', then 'who am i' or 'whoami' is fine (though they give different answers - 'whoami' reports just a user name; 'who am i' reports on terminal and login time too).
If the question is 'which user ID is the effective ID for the shell', then it is often better to use 'id'. This reports on the real and effective user ID and group ID, and on the supplementary group IDs too. This might matter if the shell is running SUID or SGID.
Jonathan LefflerJonathan LefflerYou can also retrieve it from the environment variables, but that is probably not secure, so I would go with Andrew's answer.
printenv USER
If you need to retrieve it from an app, like Node, it's easier to get it from the environment variables, such as
process.env.USER.
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6 Exiting Emacs
- C-x C-c
- Kill Emacs (
save-buffers-kill-terminal). - C-z
- On a text terminal, suspend Emacs; on a graphical display,iconify (or “minimize”) the selected frame (
suspend-frame).
Killing Emacs means terminating the Emacs program. To dothis, type C-x C-c (save-buffers-kill-terminal). Atwo-character key sequence is used to make it harder to type byaccident. If there are any modified file-visiting buffers when youtype C-x C-c, Emacs first offers to save these buffers. If youdo not save them all, it asks for confirmation again, since theunsaved changes will be lost. Emacs also asks for confirmation if anysubprocesses are still running, since killing Emacs will also kill thesubprocesses (see Shell).
C-x C-c behaves specially if you are using Emacs as a server. If you type it from a client frame, it closes the clientconnection. See Emacs Server.
https://startupgol.netlify.app/mac-aw4400-impact-driver-user-manual.html. Emacs can, optionally, record certain session information when youkill it, such as the files you were visiting at the time. Thisinformation is then available the next time you start Emacs. See Saving Emacs Sessions.
If the value of the variable confirm-kill-emacs isnon-nil, C-x C-c assumes that its value is a predicatefunction, and calls that function. If the result of the function callis non-nil, the session is killed, otherwise Emacs continues torun. One convenient function to use as the value ofconfirm-kill-emacs is the function yes-or-no-p. Thedefault value of confirm-kill-emacs is nil.
If the value of the variable confirm-kill-processes isnil, C-x C-c does not ask for confirmation before killingsubprocesses started by Emacs. The value is t by default.
To further customize what happens when Emacs is exiting, seeKilling Emacs. Quicken 2018 mac manual.
To kill Emacs without being prompted about saving, type M-xkill-emacs.
C-z runs the command suspend-frame. On a graphicaldisplay, this command minimizes (or iconifies) theselected Emacs frame, hiding it in a way that lets you bring it backlater (exactly how this hiding occurs depends on the window system). On a text terminal, the C-z command suspends Emacs,stopping the program temporarily and returning control to the parentprocess (usually a shell); in most shells, you can resume Emacs aftersuspending it with the shell command %emacs.
Text terminals usually listen for certain special characters whosemeaning is to kill or suspend the program you are running. Thisterminal feature is turned off while you are in Emacs. The meaningsof C-z and C-x C-c as keys in Emacs were inspired by theuse of C-z and C-c on several operating systems as thecharacters for stopping or killing a program, but that is their onlyrelationship with the operating system. You can customize these keysto run any commands of your choice (see Keymaps).