Questions about the command line and other Unix-like aspects of Mac OS X, including the Mach/BSD-based kernel and FreeBSD-based userland. You may want to consider using Ask Different instead.

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El Capitan 10.11.15 can't set disk with OS as startup disk, only boots if I reset nvram

Mac Pro (Mid 210) Since installing El Capitan on new HGST 6T drive I can ONLY boot this system by resetting NVRAM. If I try to restart I get apple, progress meter, then circle with line through it ...
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2answers
22 views

xargs on OSX: illegal option --

I'm on OSX. I want to run a python script against all pngs in a particular directory. This is what I've tried: find docs/ -name "*png" | xargs --replace=F python myscript.py "F" But I see this: ...
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4answers
96 views

Copy files to new directory only if name of file is in an array

I'm not much of a zsh buff but I imagine this should be an easy layup for someone: I can bulk copy files from sourcedir to targetdir with the following: $ find sourcedir -type f -exec cp {} ...
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5answers
210 views

How can I list the names of directories that contain file names matching a regex?

Given a directory X that contains several subdirectories and files, I would like to list the names of the immediate child directories of X that (directly or indirectly) contain file names matching the ...
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1answer
24 views

Zip files served by nginx do not open on Mac OS X [on hold]

I have a Windows machine where I zip my files using a gulp script, and upload them to my Linux machine in some directory under nginx. The files download and open properly on Windows, but when I ...
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2answers
55 views

How to Find LaTeX generated PDF files?

I need to find LaTeX Generated PDF files because I want to find those files made by me. I think find could possibly work here. OS X El-Capitan I run Ulrich's proposal find BitTorrentSync/ -exec ...
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1answer
30 views

install gnu command

I have the command split installed. However I need the '--filter'argument, which is supported by gnu's split command. SO I need to install gnu split. How do I do that on my mac? I tried $ brew ...
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1answer
17 views

Cannot ping OUT of a Mac OS X server

I have just inherited a Mac OS X server that is using pf. The problem I am trying to solve is why I can't ping OUT of the server. I can ping to the machine no worries, but just get timeouts on pinging ...
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1answer
47 views

Why grepping with color doesn't return anything?

I've got the following foo.txt file: This is the first line. This is the middle line. This is the last line. And I'm trying to grep the middle line just by the word middle and return the ...
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1answer
12 views

Why am I receiving the error: “sudo: update_prebinding: command not found” on the command line?

One of my applications won't open so I'm trying the first thing to do on this website: http://www.cnet.com/news/tutorial-what-to-do-when-a-mac-os-x-application-will-not-launch/ But I am getting an ...
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1answer
808 views

Create bootable hfs+ partition for macbook

I've installed Debian testing on a Macbook Pro (mid 2014) without keeping OS X on the internal SSD. I've used the following GPT partition layout: HFS+ EFI on /boot/efi BTRFS on / SWAP on swap I've ...
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4answers
5k views

How can I determine the fs type of my current working directory?

I need a platform-independent and lightweight way of detecting the mount type of my CWD. Specifically, I need to determine if my CWD is in an SSHFS, NFS, CIFS, SMB, or local block store mount. I need ...
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0answers
12 views

what does @ in file access block mean? [duplicate]

When i type ls -l i got a strange @ symbol right after the file access list in this case webshop4.sql What does the @ sign mean? I use OSX and zsh.
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1answer
2k views

Increasing `ulimit -u` settings temporarily in OSX Yosemite

I'm trying to temporarily (without restarting the machine, just for test that starts a JVM) increase the number of processes to 2048 in OSX Yosemite but I'm unable to do so. First, I tried calling ...
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0answers
29 views

Cannot ssh into server through VPN

I'm trying to ssh into my university server via vpn (PPTP). I'm on an Mac OSX 10.11.4. (El capitan) Unfortunately, I get the following error: Adams-MacBook-Pro:~ adamG$ ssh gadam@xxx.xx.xx.ac.uk ...
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0answers
41 views

How to reload Google Chrome from command line in OS X [migrated]

I am using Mac OS X and trying to write a small Unix program that can reload all Google Chrome tabs at 7AM. I have to do this every day and it will be nice to have a small program that does it for me. ...
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3answers
3k views

Transferring Files SSH SCP Error Message: 'Stdin: is not a tty'

I am using a Macbook SSH terminal and generated RSA key pairs and uploaded remote id_rsa.pub with approved permissions. I can connect with remote Apache web server. I can create, open, move, modify ...
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1answer
346 views

Error with sed on MAC OS X invalid command u

I have an error on MAC OS X when I'm using sed, which looks like so: sed -i '' '/user_pref("mail.identity.id1.reply_on_top", 1);/ a\ user_pref("mail.identity.id1.sig_file", ...
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1answer
21 views

tmux not printing ANSI colors in status bar

I'm using Mac OSX Yosemite, and I use istats to get CPU temperatures: I wanted to put my CPU temperature in my tmux status bar, so I made my tmux config the following: As you can see, when I ran ...
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1answer
6k views

Running Java classes in a package --> Error: Could not find or load main class

I'm learning how to compile and run java classes in terminal using the commands javac and java. I have no problem compiling and running an individual class, however, when I put that class into a ...
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3answers
462 views

A lot of “._” files inside a tar

I have a tar that was generated on a linux machine. I need to upload part of that tar to another linux machine. The full tar is huge and will take hours to upload. I am now on a Mac OSX machine and ...
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1answer
3k views

Sound volume control does not work in Ubuntu

My sound volume control does not work when I'm logged in with my regular user, though the sound works correctly. What's weirder is that the sound control works when I'm logged in as guest. With my ...
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0answers
22 views

wakeonlan: cannot wake up ubuntu server 16.04

I can wake up ubuntu server 16.04 from my iphone using WOL. I tried to do the same thing from mac osx yosemite. couldn't get it work. first I installed wakeonlan. "brew install wakeonlan" then I ran ...
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1answer
27 views

Is there a minimal POSIX shell for OS X?

Is there a minimal POSIX shell implementation for OS X? I like to write fairly portable shell scripts and want to catch as many incompatibilities or bashisms up front as I can. I'm not intending to ...
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1answer
74 views

How to display images in OSX terminal

How do I display images in the terminal? I am on Mac OSX mountain lion (10.8.5), and the answers in this question don't work on OSX. Is it possible at all?
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1answer
30 views

Darwin strips setuid from interpreter in hash bang execution

This is not exactly a question about how to run a hash bang script. In this situation, a hash bang script exists which doesn't (necessarily) have the u+s permission. Rather, the interpreter has u+s, ...
0
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1answer
6 views

Netatalk users can't read World/Other readable files

I'm using Netatalk to share documents with several Mac machines. Regardless of what permissions I'm using for the file (typically 775 for folders and 664 for files) they can't be read by users in the ...
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2answers
35 views

Regex in find - OS X

I cannot figure out what's wrong with my regex, it seems to be working with grep but now with find. I'm trying to find all the files which follow the common expression in TV shows e.g. S02E21. find ...
1
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1answer
30 views

how to inject keystrokes in a program like Safari from a bash script?

I am trying to automate some keypresses every few minutes. The exact timing is still undetermined. But basically I want to capture a live chat dialogue. I'm sure I could do this more elegantly. I ...
2
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2answers
1k views

Linux guest VM on mac host - Keyboard

I use a Mac as a development box, but am slowly transitioning to Linux. So I am spending the majority of my time in the Linux guest VM while working. But I still spend a fair amount of time in Mac ...
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5answers
33k views

How can I install the `ll` command on Mac OS X?

I'm using Mac OS X. When I SSH into servers I find the ll command useful, but it's not available on my local machine. How can I install it?
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2answers
24 views

How can I give files extended attributes in mac os x?

How can I give files extended attributes in mac os x? Mac os x doesn't have the 'setattr' command.
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1answer
19 views

OSX: Grammarian won't uninstall

Im trying to uninstall an annoying app on my Mac called Grammarian Pro X and the uninstaller doesn't work with my version of OSX 10.11. You can uninstall the main app but there is still bits of the ...
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1answer
62 views

I'm trying to install ncmpcpp, but when installing boost it hangs here

The following shows what happens when I try to install ncmpcpp (on OS X): brew install ncmpcpp !181 ==> Installing dependencies for ...
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6answers
4k views

How to grep-inverse-match and exclude “before” and “after” lines

Consider a text file with the following entries: aaa bbb ccc ddd eee fff ggg hhh iii Given a pattern (e.g. fff), I would like to grep the file above to get in the output: all_lines except ...
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1answer
65 views

Sed a plist file gives a iilegal byte sequence

With a Unix Mac 10.9.5, French CA version I've read a lot of tips but if the error is gone, the plist is corrupted. the locale command gives: LANG="fr_CA" LC_COLLATE="fr_CA" LC_CTYPE="fr_CA.UTF-8" ...
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2answers
175 views

Invalid command code with sed

This is the command I am using: system_profiler | sed -n -e '/SATA/SATA Express:/,/Software:/ p' It gives me this error sed: 1: "/SATA/SATA Express:/,/S ...": invalid command code S I don't see ...
2
votes
1answer
46 views

Error on enabled probe: syscall::open_nocancel:entry): invalid user access in action #2 at DIF

I've the following one-liner to show files opened by process: sudo dtrace -n 'syscall::open*:entry { printf("%s %s",execname,copyinstr(arg0)); }' however I've plenty of repeated errors such as: ...
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0answers
29 views

Directory became UNIX binary (OS X)

I recently fixed the file permissions of my home directory using System Recovery mode. But after rebooting I found that one directory had become a single unix binary. I have tried everything from ...
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2answers
69 views

What is the best way to setup 3 HDDs with 3 OS on one computer?

I am building a new PC, I am a developer of whatever people want me to make, but I personally like to code games. To do this, I have a simple set of requirements: Machine must run Windows 7, to run ...
93
votes
12answers
75k views

How do I know if dd is still working?

I've not used dd all that much, but so far it's not failed me yet. Right now, I've had a dd going for over 12 hours - I'm writing an image back to the disk it came from - and I'm getting a little ...
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1answer
36 views

To plot 7x10 pictures for review in video

Assume you have 77777 pictures. You want to review them and their differences: have 7x10 pictures without margins to have an image viewer where the minimum browse time can be less than 1.0 s such ...
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votes
3answers
14k views

How can I change my bash prompt to show my working directory?

I can print my current working dir like this myPrompt$ pwd /Users/me/myDir I want my shell to look like this /Users/me/myDir$ pwd /Users/me/myDir Is that possible? How can I do it?
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1answer
21 views

Redirecting output of `man <command>` to file produces file with tons of `^H` characters on OS X [duplicate]

The following behavior occurs in OS X (10.9.5) with the BSD utils, but not Linux (Ubuntu 15.10) with the GNU utils. OS X: $ man -v man, version 1.6c Linux: $ man --version man 2.7.4 I'm ...
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0answers
32 views

Schedule on boot persistent reverse SSH tunnel on Mac OSX

In attempts to run a self sustaining reverse ssh tunnel I have tried installing the 'autossh' package with brew. Autossh works alone when ran through the user's prompt, but not with launchctl/launchd. ...
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0answers
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Boot0:error on hackintosh yosemite

I have installed Hackintosh Yosemite on my HP Pavilion G6. After rebooting, I keep getting this error: boot0ss:error, therefore the Chameleon boot screen does not display for me to choose between ...
2
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4answers
55 views

How to know which ports are listened by certain PID?

I have a PID of certain process listening some port(s) on my OS X and I need to know which port(s) is listened by this process. How can I do it? I know I can use lsof to know which process is ...
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2answers
61 views

How do you make filesystems in mac OSX

How do you make filesystems in mac OSX? Mac OSX doesn't have the 'mkfs' command. Thank You
2
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1answer
42 views

Feasibility of open source OS that is binary compatible with OS X?

Could this be achieved? It would have to be done legally, without infringing on Apple's copyrights. Could it be built on a Darwin, FreeBSD or other base and then aim for binary compatibility with OS ...
3
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2answers
490 views

Why does my ls --help not work?

Marias-MacBook-Air:~ marias$ ls --help ls: illegal option -- - usage: ls [-ABCFGHLOPRSTUWabcdefghiklmnopqrstuwx1] [file ...]