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How can I do division with variables in a Linux shell?
...will be:
x=20; y=3;
calc $x/$y
or if you prefer, add this as a separate script and make it available in $PATH so you will always have it in your local shell:
#!/bin/bash
calc(){ awk "BEGIN { print $* }"; }
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How to make Twitter Bootstrap menu dropdown on hover rather than click
...enu automatically drop down on hover, rather than having to click the menu title. I'd also like to lose the little arrows next to the menu titles.
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HTML5shiv vs Dean Edwards IE7-js vs Modernizr - which to choose?
...tags in IE, like html5shiv.
ie7.js (as well as ie8.js and ie9.js) uses Javascript to retro-fit some missing functionality to IE.
As far as I'm aware there's no cross-over between them (aside from html5shiv/modernizr), so you can use any combination of them, depending on what features you need to i...
Modify file in place (same dest) using Gulp.js and a globbing pattern
...emaps.write('./'))
.pipe(gulp.dest("."));
});
//scripts
gulp.watch([srcPath + '.js','!'+ srcPath + 'min.js']).on("change", function(file) {
console.log("Compiling JS File: " + file.path)
gulp.src(file.path, { base: "./" })
.pipe(uglify())
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Why is parenthesis in print voluntary in Python 2.7?
...SCII is default encoding for Python. But I have at the beginning of Python script #encoding=utf-8, linux env LANG=en_US.UTF-8. So repr encodes not using default ASCII, but utf-8 encoding.
– Karlo Smid
Aug 18 '12 at 9:22
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List files by last edited date
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Great code, it took the script approx. 5 seconds to sort and print out 13k photos in many different folders (through Cygwin on a quite slow computer).
– Magnus
Jan 21 '12 at 10:14
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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 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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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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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;};}"...