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Checking for the correct number of arguments
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#!/bin/sh
if [ "$#" -ne 1 ] || ! [ -d "$1" ]; then
echo "Usage: $0 DIRECTORY" >&2
exit 1
fi
Translation: If number of arguments is not (numerically) equal to 1 or the first argument is not a directory, output usage to stderr and exit with a failure status code.
More friendly er...
python re.sub group: number after \number
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330
The answer is:
re.sub(r'(foo)', r'\g<1>123', 'foobar')
Relevant excerpt from the docs:
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Which, if any, C++ compilers do tail-recursion optimization?
...s such as:
int bar(int, int);
int foo(int n, int acc) {
return (n == 0) ? acc : bar(n - 1, acc + 2);
}
int bar(int n, int acc) {
return (n == 0) ? acc : foo(n - 1, acc + 1);
}
Letting the compiler do the optimisation is straightforward: Just switch on optimisation for speed:
For MSVC,...
Query for array elements inside JSON type
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Mar 29 '14 at 22:25
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how to use “AND”, “OR” for RewriteCond on Apache?
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120
This is an interesting question and since it isn't explained very explicitly in the documentatio...
Convert Array to Object
... It will return the target object.
Object.assign({}, ['a','b','c']); // {0:"a", 1:"b", 2:"c"}
The own length property of the array is not copied because it isn't enumerable.
Also, you can use ES6 spread syntax to achieve the same result:
{ ...['a', 'b', 'c'] }
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How do I access the host machine from the guest machine? [closed]
...or example, if your IP address is 192.168.78.128, use http://192.168.78.1:3000.
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Matplotlib plots: removing axis, legends and white spaces
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406
I think that the command axis('off') takes care of one of the problems more succinctly than cha...
“simple” vs “current” push.default in git for decentralized workflow
...hat has the same name:
$ git config push.default current
$ git push
Total 0 (delta 0), reused 0 (delta 0)
To /Documents/GitHub/bare
* [new branch] foo-> foo
The Documentation
From the Git configuration documentation:
upstream - push the current branch to its upstream branch...
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if, elif, else statement issues in Bash
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460
There is a space missing between elif and [:
elif[ "$seconds" -gt 0 ]
should be
elif [ "$sec...