Posted by jpluimers on 2020/06/29
For quite a while, I had the error “The application “Audacity.app” can’t be opened.” and Audacity still opening. Clicking the OK button often enough made me hunt for the solution:
This is what I did:
$ cd ~/Library/Application\ Support/audacity
$ grep Temp audacity.cfg
TempDir=/Users/jeroenp/Library/Application Support/audacity/SessionData
Then I checked if the directory existed:
Posted in *nix, *nix-tools, Apple, Audacity, Audio, Mac, Mac OS X / OS X / MacOS, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, Media, Power User, sed | Leave a Comment »
Posted by jpluimers on 2020/06/05
The Terminal on Mac OS X / OS X / MacOS is very much like a Linux terminal, but there are also a lot of differences especially with keyboard, tab and process handling.
So this chapter is very much wort reading: [WayBack] 1. Inside the Terminal – Mac OS X For Unix Geeks, 4th Edition [Book]
–jeroen
Posted in Apple, iMac, Mac, Mac OS X / OS X / MacOS, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, Power User | Leave a Comment »
Posted by jpluimers on 2020/05/07
Based on [WayBack] How to set default apps on Mac | iMore.
–jeroen
Posted in Apple, iMac, Mac, Mac OS X / OS X / MacOS, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, Power User | Leave a Comment »
Posted by jpluimers on 2020/04/13
Toggle between regular view and view all formulas in a worksheet via [WayBack] Quickly See All the Formulas in Excel with This Shortcut which I wish I had known years ago:
- Windows:
Ctrl+`(the acute accent key, found next to the number 1 on your keyboard).- MacOS:
Cmd+`
Found using image search macos excel show all formulas – Google Search
–jeroen
Posted in Apple, Excel, Mac, Mac OS X / OS X / MacOS, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, macOS 10.12 Sierra, macOS 10.13 High Sierra, Office, Office 2011 for Mac, Power User | Leave a Comment »
Posted by jpluimers on 2020/03/06
I wrote a bit on using screen from my Mac in The woods and trees of OpenSuSE on single-board computers – image abbreviations – and getting it installed using OS X.
The coverage was way too brief and also buried in large post.
Today, I want to focus on some things related to properly terminating a a screen window, session or screen by itself from a Mac which somehow is one of the harder things for me to do.
I’m talking about sessions and windows, because
screenis a terminal multiplexer, which can also put a serial link in a window on a session. So screen is not “just” a serial console terminal application by itself.
Part of being hard is probably that even on for instance 10.12 Sierra, Apple ships a fairly old version: screen --version returns Screen version 4.00.03 (FAU) 23-Oct-06 whereas after 2014 (before that, screen development was pretty stalled) many new versions appeared: [WayBack] screen.git.
It makes it less hard that it hardly reproduces, and seems to reproduce less with the screen version I installed through homebrew: Screen version 4.06.02 (GNU) 23-Oct-17.
Time to make some notes so I can hopefully amend them later with solutions.
screen magic keyWhen screen gives you a session to a terminal, all but one key are being routed through on a 1-on-1 base except for a “magic” key combination: Ctrl–a (which the documentation abbreviates as C-a).
Following the Ctrl–a combination, you can type a character (sometimes that needs Ctrl too) for a lot screen functionality (for a start, see the “Getting help” below).
screen sessions and windowsYou list screen sessions from the command-line. I usually combine the latter with getting a process list as well using this command because the process list will show you parameters passed to screen:
ps -ax | grep screen && screen -list
which gets you output like this:
31992 ttys019 0:00.01 screen
29040 ttys020 0:00.04 screen /dev/cu.usbserial 115200
31898 ttys021 0:00.01 screen
32503 ttys025 0:00.00 grep screen
There are screens on:
29041.ttys020.RMBPro1TBJWP (Attached)
31899.ttys021.RMBPro1TBJWP (Attached)
31993.ttys019.RMBPro1TBJWP (Attached)
3 Sockets in /var/folders/zr/dsp77fhs6zq179n72lykjrjw0000gq/T/.screen.
Many people abbreviate screen -list as screen -ls, but I like descriptive commands over cryptic ones.
What you see is that:
From within each session, you can use the Ctrl–* combination to list the Windows. For the both non-serial sessions – looked like this on my machine:
term-type size user interface window ---------- ------- ---------- ----------------- ---------- xterm-256c 84x28 jeroenp@/dev/ttys019 0(bash) rwx
and
term-type size user interface window ---------- ------- ---------- ----------------- ---------- xterm-256c 84x28 jeroenp@/dev/ttys021 1(bash) rwx
The first was for session 31899.ttys021.RMBPro1TBJWP, the second for 31993.ttys019.RMBPro1TBJWP.
The -x parameter can attach to both an Attached or a Detached screen session. This allows for:
terminal tabs to see the same contentDetached sessions keep their windows and the commands running in those windows. This allows you to have long-running scripts starting from the terminal but not terminated when the terminal closes.
So in my case, this command attaches to the second session not matter if it is attached or detached.
screen -x 31993.ttys019.RMBPro1TBJWP
When killing a window, all the processes in that window will be killed too.
Typing Ctrl–a followed by k or Ctrl–k will kill the current window.
When killing a session, it will kill all the windows with all the processes in those windows.
Typing Ctrl–a followed by Ctrl–\ will kill the current session with all the windows in it. On some Linux systems, you can replace Ctrl–\ with just \.
I’ve not run into dead sessions yet, but if I do, I should try the -wipe command line option as shown in [WayBack] How to kill a dead screen session? – Stack Overflow (which also shows this can fail if you run out of disk space, but then you have bigger issues).
I still need to research this further, as every now and then I run into this:
# ps -ax | grep -w screen && screen -list 29040 ?? 0:00.04 screen /dev/cu.usbserial 115200 35724 ttys025 0:00.00 grep -w screen There is a screen on: 29041.ttys020.RMBPro1TBJWP (Attached) 1 Socket in /var/folders/zr/dsp77fhs6zq179n72lykjrjw0000gq/T/.screen.
Wiping it fails:
# screen -wipe 29041.ttys020.RMBPro1TBJWP There is a screen on: 29041.ttys020.RMBPro1TBJWP (Attached) 1 Socket in /var/folders/zr/dsp77fhs6zq179n72lykjrjw0000gq/T/.screen.
Attaching however times out:
# screen -x 29041.ttys020.RMBPro1TBJWP
For now, the only option is to reboot my system.
I’ve seen this happening mostly with cables that present themselves as prolific PL2303HX chipset.
So I will get some TTL debug cables based on other chipsets.
These posts will help finding about the available serial cables:
It is daunting, but the man screen page [WayBack] has a truckload of information, for instance on the command-line options, key bindings and much more.
If you like on-line lists of tips more, then follow these:
The man page will get you most of that information:
Screen version 4.00.03 (FAU) 23-Oct-06
Copyright (c) 1993-2002 Juergen Weigert, Michael Schroeder
Copyright (c) 1987 Oliver Laumann
This program is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program (see the file COPYING); if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Send bugreports, fixes, enhancements, t-shirts, money, beer & pizza to
screen@uni-erlangen.de
[Press Space or Return to end.]
Here you can press Ctrl-A followed by : to get a prompt where you can type help:
[Press Space or Return to end.]
:help
There you get one or two (depending on your terminal size) pages of help:
Screen key bindings, page 1 of 2. Command key: ^A Literal ^A: a break ^B b license , reset Z clear C lockscreen ^X x screen ^C c colon : log H select ' copy ^[ [ meta a silence _ detach ^D d monitor M split S digraph ^V next ^@ ^N sp n suspend ^Z z displays * number N time ^T t dumptermcap . only Q title A fit F other ^A vbell ^G flow ^F f pow_break B version v focus ^I pow_detach D width W hardcopy h prev ^H ^P p ^? windows ^W w help ? quit ^\ wrap ^R r history { } readbuf < writebuf > info i redisplay ^L l xoff ^S s kill ^K k remove X xon ^Q q lastmsg ^M m removebuf = [Press Space for next page; Return to end.]followed by:
Screen key bindings, page 2 of 2. ^] paste . " windowlist -b - select - 0 select 0 1 select 1 2 select 2 3 select 3 4 select 4 5 select 5 6 select 6 7 select 7 8 select 8 9 select 9 ] paste . [Press Space or Return to end.]
–jeroen
Partially based on: [WayBack] terminate screen monitoring serial port – Unix & Linux Stack Exchange.
Posted in *nix, *nix-tools, Apple, Mac, Mac OS X / OS X / MacOS, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, macOS 10.12 Sierra, macOS 10.13 High Sierra, OS X 10.10 Yosemite, OS X 10.11 El Capitan, Power User, screen | Leave a Comment »
The Wiert Corner - irregular stream of stuff 