On Linux, the nice command has an abbreviated form without -n, eg you can do:
nice -3 something
It can cause a little confusion at times that the -3 is equivalent to -n +3 not -n -3.
It is worth adding that there is no nice +3 or even nice 3. Furthermore, UNIX nice only has the -n form.
As an example, the the two lines below print the default nice level (eg 5) and the default plus one (eg 6):
yes >/dev/null & ps -o %n $! && kill $! nice -1 yes >/dev/null & ps -o %n $! && kill $!
What a fine overview of load information on Linux systems by Brendan Gregg:
http://www.brendangregg.com/blog/2017-08-08/linux-load-averages.html
Thanks to the author for putting this out
In some contexts, such as readme files rendered by GitHub, I would like to preview my Markdown changes before pushing them
Precisely for this Joe Esposito wrote a tool that starts a local web server to render Markdown files:
To my surprise, this is enabled and working in my version 8.2.1719 MacVim. The below adds a run icon to the touch bar that triggers a custom command:`
:an TouchBar.Run :!make && ./run<Enter>And the below deletes this item:
:an disable TouchBar.RunFor documentation, start in gui_mac.txt (runtime directory of MacVim installation).
I got ‘Error 403: SSL is required’ today while trying to install JsonUtils using PIP. I was able to install directly from sources by passing the GitHub URL to PIP install.
This worked to use SSH over port 443:
git clone ssh://git@ssh.github.com:443/company/one_big_repo.git
where previously HTTPS would give me ‘hung up unexpectedly’:
error: RPC failed; curl 18 transfer closed with outstanding read data remaining
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
Requires TCL headers, so first build and install TCL 8.5.9 to match version in my macOS 10.14:
./configure --prefix=/usr/local
sudo make all install
Then build and install modules 4.2.2:
./configure --prefix=/usr/local/Modules/4.2.2 --without-x --with-tcl=$HOME/tcl8.5.9/macosx
make
sudo make install
Note that you specify the build directory not install directory (which would be /usr/local in this case). That’s because configure is looking for tclConfig.sh.
References:
In my quest to avoid install Homebrew or MacPorts, I ended up with the following steps to install pyaudio using pip
1. Place my a binary of PortAudio in /usr/local/lib. This is the 2016 ‘stable’ version v190600_20161030 that Homebrew still appears to use as well. I didn’t try compiling it from scratch as it requires Mac SDK 10.9 or older.
2. My binary was compiled on another system, and had the wrong LC_ID_DYLIB path. To correct that I did: sudo install_name_tool -id /usr/local/lib/libportaudio.dylib /usr/local/lib/libportaudio.dylib.
3. Place the corresponding pa_mac_core.h in /usr/local/include
4. Upgrade pip: sudo pip install --upgrade pip
5. Install PyAudio: sudo pip install --global-option=build_ext --global-option=-L/usr/local/lib --global-option=-I/usr/local/include pyaudio.
Thanks to Stack Overflow for pointing me to the global-option pip flags. Like another user I wondered why pip wouldn’t pick up /usr/local for dependencies by default.
Thanks also to author of the following, which was useful in reading up on the relevant parts of the Mac dynamic linker:
Shell script to stack all active application windows on top each other in one of two possible layouts. The 2-column layout has an 80-character full height terminal on the left and everything else on the right of it. The 2-column layout has an 80-character full height terminal in the middle and everything else on either side of it.
Embedded Software Engineer's IT 