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61 votes
Accepted

GZip doesn't produce the same compressed result on macOS vs Linux

Note that the compression algorithm (Deflate) in GZip is not strictly bijective. To elaborate: For some data, there's more than one possible compressed output depending on the algorithmic ...
  • 656
60 votes
Accepted

Why did {} start appearing as äå in Terminal.app?

I can reproduce it with the xterm terminal emulator (version 366), if I do: $ printf '\e[?42h\e(H'; cat chars.txt; printf '\e(B\e[?42l' !É#$%Ü&*()_+äå Where: \e[?42h. Enables National ...
59 votes
Accepted

How can I set the default editor as nano on my Mac?

Set the EDITOR and VISUAL environment variables to nano. If you use bash, this is easiest done by editing your ~/.bashrc file and adding the two following lines: export EDITOR=nano export VISUAL="...
  • 306k
59 votes
Accepted

Why does awk -F work for most letters, but not for the letter "t"?

Because: Normally, any number of blanks separate fields. In order to set the field separator to a single blank, use the -F option with a value of [ ]. If a field separator of t is specified, awk ...
  • 126k
48 votes

ssh connection "client_loop: send disconnect: Broken pipe" or "Connection reset by <IP> port 22"

I solved the same problem by editing the file ~/.ssh/config to have: Host * ServerAliveInterval 20 TCPKeepAlive no Motivation: TCPKeepAlive no means "do not send keepalive messages to ...
35 votes

How to fix "VirtualBox VM quit unexpectedly" when running my Ubuntu 20.04 LTS VM on MacOS Catalina 10.15 in VirtualBox?

Go to Settings > Audio and uncheck "Enable Audio". There seems to be a bug that crashes Ubuntu 20.04 LTS in VirtualBox when it attempts to check audio input permissions with CoreAudio. 00:...
  • 451
31 votes

How do I delete a directory that contains only '.' and '..', but rm says is not empty?

Your directory looks empty, but the ls output indicates that there is a file in there since the link count for the directory is 3 rather than 2 (an empty directory on an APFS filesystem should have a ...
  • 306k
28 votes

Why can't I pipe `pwd` to `open` on macOS?

The open utility on macOS does not read from standard input, but take its arguments from the command line. To open the current working directory, you would have to say $ open "$( pwd )" or $ open "...
  • 306k
28 votes
Accepted

Why does 'ls' only display contents when I'm in a certain directory?

The difference is physical vs. logical treatment of ..: You apparently have two separate Downloads directories: one is /Users/ciprian/Downloads the other is /Users/ciprian/Library/CloudStorage/...
  • 77.4k
22 votes
Accepted

How to move directory into a directory with the same name?

To safely create a temporary directory in the current directory, with a name that is not already taken, you can use mktemp -d like so: tmpdir=$(mktemp -d "$PWD"/tmp.XXXXXXXX) # using ./tmp.XXXXXXXX ...
  • 306k
21 votes

Remove files without string in name

Just invert the name condition in find : find . -type f \! -name "*999*" Add -delete or -exec rm {} + to actually remove the matched files.
  • 126k
21 votes
Accepted

Remove files without string in name

Using an extended globbing pattern in bash: rm ./!(*999*) This requires shopt -s extglob to be enabled (and for safety, also shopt -s failglob, so that no file with the unusual name !(*999*) gets ...
  • 306k
20 votes

GZip doesn't produce the same compressed result on macOS vs Linux

The format should be very stable, but see its description. It contains a field for operating system ID.  Obviously that may differ for macOS and Linux and FreeBSD and ...
  • 18k
20 votes

What is the convention for options/questions in terminal?

If you just hit enter, it assumes the part in brackets. In your case, the default is “n”.
19 votes
Accepted

Why can't I pipe `pwd` to `open` on macOS?

I don't have a Mac so I can't test it, but the solution should be something like: open "`pwd`" Not all programs take their input from stdin which would be necessary for the pipe to work.
19 votes

MacOS Terminal start up slow, the window title transitions between "login", "env", "bash" then "zsh" - but /bin/zsh starts fast in isolation

Ok turns out homebrew added around 100 calls to set itself in my ~/.zprofile file
16 votes

Why do I lose my ZSH history?

ZSH History file can be truncated/lost/cleaned for multiple reasons those can be: Corruption of the zsh history file (because of a power-cut/system-fail while a shell is opened, in this case fsck ...
  • 13.4k
16 votes

How to install docker-engine in macOS without docker desktop?

There is an alternative to docker, it is podman. Install: brew install podman Download and prepare the VM: podman machine init Turn on the VM: podman machine start Uses as a docker: podman run -d -p ...
  • 261
15 votes
Accepted

mktemp on macOS not honouring $TMPDIR

/var/folders/qg/s5jp5ffx2p1fxv0hy2l_p3hm0000gn/ This is your Darwin user local directory. Its name is simply a modified base 32 encoding of the concatenation your MacOS User UUID and your MacOS (BSD)...
  • 64.5k
15 votes

What is the convention for options/questions in terminal?

zsh is not a terminal, it's just a shell, a programming language with an interactive mode specialised in running other commands. Terminal emulators such as xterm, gnome-terminal are configured to run ...
14 votes

Replacing string in file with MAC OSX

How it to do with sed in OS X. I've created test file: $ cat test.txt tasdasdasd asd asd as d as d ddddddd ffdfdfdfdfdf Calling sed ('' is necessarily parameter): $ sed -i '' "s/as/replaced_ad/g"...
14 votes

How to install docker-engine in macOS without docker desktop?

On my Macbook, I've installed docker via homebrew with brew install docker docker-compose docker-machine xhyve docker-machine-driver-xhyve (though this was way before docker desktop became non-free, ...
  • 30.5k
14 votes
Accepted

tr command unable to process colour output piped from grep

To output matches in colour, grep writes colouring escape sequences before and after the match. Those are instructions to the terminals to change their background and/or foreground colour. It's ...
13 votes

How can I create a shortcut to resize panes in a tmux window?

Below are my keybindings that let me resize a pane. It uses Alt + direction, where the keys for the directions are the same as in Vim: k h l j # Resize the current pane using Alt + direction ...
13 votes

No xauth program; cannot forward X11

Both your client and the server are complaining that they can't find the xauth program. The "debug1: No xauth program" message comes from your client, saying it can't find a copy of xauth locally. The ...
  • 2,845
13 votes

Where can I find a complete list of format specifiers for the date command?

The manual for the C language function strftime() (man strftime) should contain all the date format specifiers across most Unix and Unix-like systems. The strptime() function has to do with parsing ...
  • 1,445
12 votes
Accepted

MacOS quotation marks turning italic and breaking scripts

These aren't italic, they're the "typographically correct" open- and close-quotes. But they are pretty useless in a shell To disable them globally: System Preferences > Keyboard > Text ...
  • 7,873
11 votes

How do I install htop in mac OS X?

I installed htop 0.8 (update: now 2.0.1) from MacPorts with sudo port install htop
11 votes
Accepted

How to mirror directory structure and files with zero size?

GNU cp (from coreutils) can do this: cp -r --attributes-only original_folder/* mirrored_folder/ From man cp: --attributes-only don't copy the file data, just the attributes -R, -r, --recursive copy ...
  • 39.7k
11 votes
Accepted

Move files to directory based on extension (zsh, macOS)

You're not doing anything wrong. It's totally normal when you begin scripting to have your first script be nothing but a list of commands one after another. But hopefully you will learn to go beyond ...
  • 7,891

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