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How to download Xcode simulator directly
Due to network issues, downloading the runtime is not always smooth, so it is best to download it directly with support for resuming interrupted downloads.
1. Find the downloaded URL
Use console
- Open Xcode, open preferences, go to the Components section.
- Open the
Console App, clear the console. - Go back to the
Xcode preferences. Start the simulator download, then cancel it. - Now in the Console, you will see something about the cancellation with the download URL. ( Process is
xcodeand maybe search keyworddownload) - Copy the URL from the Console. Then download it by safari. ( or some other way which is authed )
Offical dowloaded from apple
- Go to apple developer website and login.
- You can find all Xcode dmg/xip files directly on https://developer.apple.com/download/all/ (requires Apple ID).
- Find the simulator runtimes you want and download.
2. Download the DMG file
Now you can download it using Safari or another authorized method.
3. Add runtime
Finally, just run
xcrun simctl runtime add iOS_xxx_Simulator_Runtime.dmgWrite commands with multiple lines in Dockerfile
There are several ways to write commands with multiple lines in Dockerfile, for example you wanna echo a bash file entrypoint.sh with content:
#!/bin/bash
echo 3
echo 2
echo 1
echo run
You could:
Using printf
RUN printf '#!/bin/bash\necho 3\necho 2\necho 1\necho run' > /entrypoint.sh
Using cat
RUN sh -c "$(/bin/echo -e "cat > /entrypoint.sh <<EOF\
\n#!/bin/bash\
\necho 3\
\necho 2\
\necho 1\
\necho run\
\nEOF\n")"
Using echo -e
RUN echo -e " #!/bin/bash\n\
echo 3\n\
echo 2\n\
echo 1\n\
echo run" > /entrypoint.sh
Using $'...'
The $’…’ feature is known as "ANSI-C quoting" but it’s not a POSIX shell > feature. According to unix.stackexchange.com/a/371873/109111 it was > originally a ksh93 feature but it is now available in bash, zsh, mksh, > FreeBSD sh and in busybox’s ash
RUN echo $'#!/bin/bash\n\
echo 3\n\
echo 2\n\
echo 1\n\
echo run' > /entrypoint.sh
echo -e & $'...' are both similar in that they support the following escape sequences:
\a alert (bell)
\b backspace
\e
\E an escape character
\f form feed
\n new line
\r carriage return
\t horizontal tab
\v vertical tab
\\ backslash
\0nnn the eight-bit character whose value is the octal value nnn (zero to three octal digits)
\xHH the eight-bit character whose value is the hexadecimal value HH (one or two hex digits)
\uHHHH the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value HHHH (one to four hex digits)
\UHHHHHHHH
the Unicode (ISO/IEC 10646) character whose value is the hexadecimal value HHHHHHHH (one to eight hex digits)
They do have differences. In addition to the above, echo -e supports:
\c suppress further output
\0nnn the eight-bit character whose value is the octal value nnn (zero to three octal digits)
By contrast, $'....' supports:
\' single quote
\" double quote
\nnn the eight-bit character whose value is the octal value nnn (one to three digits)
\cx a control-x character
Some Common OpenSSL Commands
OpenSSL is a robust, commercial-grade, and full-featured toolkit for the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols. It’s useful but hard to remember so many commands, so I have listed some common usages below.
Continue reading3D Printer Auto Bed Leveling Mesh Visualizer
You can paste the Marlin G29 result, for example, to make it more visual.
Continue readingHow to bash multithread?
I do think using xargs to run code multithread in bash is a better way, you still could use fifo. Just like the sample below:
#!/bin/bash
function a_sub
{
sleep 3
}
tmp_fifofile="/tmp/$$.fifo"
mkfifo $tmp_fifofile
exec 6<>$tmp_fifofile
rm $tmp_fifofile
thread=15
for((i=0;i<$thread;i++));do
echo
done >&6
for((i=0;i<50;i++));do
read -u 6
{
a_sub && {
echo "a_sub is finished"
} || {
echo "sub error"
}
echo >&6
}&
done
exec 6>&-
waitHow to print on the same line in shell
#!/bin/bash
for i in `seq 10 1`;do
echo -en "\r\x1B[2K";
echo -n "$i";
sleep 2;
done;\x1b[2K is what’s known as an ANSI terminal control sequence.
\x1b is the ASCII for ESCAPE (literally the ESC key on your keyboard). [2K is the command “erase the current line”.
ESP8266 Pinout
ESP8266 Pinout
Useful bash functions
Get bash file absolute path
realpath(){
path="$1"
while [ -h "$path" ] ; do path="$(readlink "$path")"; done
echo "$(cd "$(dirname "$path")"; echo -n "$(pwd)/$(basename "$path")")";
}Log
log() {
if [[ -n "$VERBOSE" ]]; then echo -e "$@"; else test 1; fi
}
error() {
echo "$@" >&2
exit 1
}
warning() {
echo "$@" >&2
}
function check_status {
if [ $? -ne 0 ];then
error ${@:-"Encountered an error, aborting!"}
fi
}Loop find
find . -type f -iname "*.txt" -print0 | while IFS= read -r -d $'\0' line; do
echo "$line"
ls -l "$line"
doneArduino Uno And Nano Pinout Diagram
Arduino Uno And Nano Pinout Diagram, as shown in the figure …