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Define make variable at rule execution time
...latively easy way of doing this is to write the entire sequence as a shell script.
out.tar:
set -e ;\
TMP=$$(mktemp -d) ;\
echo hi $$TMP/hi.txt ;\
tar -C $$TMP cf $@ . ;\
rm -rf $$TMP ;\
I have consolidated some related tips here: https://stackoverflow.com/a/29085684/86967
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How often does python flush to a file?
...me.
Credits: this code was copied mostly from the liveAPI control surface scripts by Nathan Ramella
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How to ignore xargs commands if stdin input is empty?
... nothing) for compatiblity reasons.
I personally prefer using longopts in scripts but since the *BSD xargs does not uses longopts just use "-r" and xargs will act the same on *BSD an on linux systems
xargs on MacOS (currently MacOS Mojave) sadly don't supports the "-r" argument.
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Regex lookahead for 'not followed by' in grep
...grep or your grep doesn't support --perl-regexp, you can you one-line perl scripts that work the same way like grep:
perl -e "while (<>) {if (/Ui\.(?!Lines)/){print;};}"
Perl accepts stdin the same way like grep, e.g.
ipset list | perl -e "while (<>) {if (/packets(?! 0 )/){print;};}"...
Depend on a branch or tag using a git URL in a package.json?
...s.com/cli/publish and then check the repo you are installing for the build scripts. Maybe they are tagged or the post-install does not work for you, it's an issue for that specific package anyway hope this helps !
– vortex
Sep 29 '17 at 17:50
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App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
... function HideORDispFeedback() { $("#feedback").toggle();}function makeTitleDraggable(element, titleElement) { let isDragging = false; let offsetX, offsetY; // 只在标题栏上按下时开始拖动 titleElement.onmousedown = function(e) { isDragging = true; offset...
What is your most productive shortcut with Vim?
...reated as an extension of our editor. I have occasionally used these with scripts that pulled data from a database, or with wget or lynx commands that pulled data off a website, or ssh commands that pulled data from remote systems.
Another useful ex command is :so (short for :source). This reads t...
How to execute multi-line statements within Python's own debugger (PDB)
So I am running a Python script within which I am calling Python's debugger, PDB by writing:
6 Answers
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background function in Python
I've got a Python script that sometimes displays images to the user. The images can, at times, be quite large, and they are reused often. Displaying them is not critical, but displaying the message associated with them is. I've got a function that downloads the image needed and saves it locally. Rig...
Select random lines from a file
In a Bash script, I want to pick out N random lines from input file and output to another file.
4 Answers
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