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Extract substring in Bash
...unning this inside a script as "sh run.sh", one might get Bad Substitution error. To avoid that, change permissions for run.sh (chmod +x run.sh) and then run the script as "./run.sh"
– Ankur
Jan 6 '15 at 10:13
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Regex - how to match everything except a particular pattern
... the DFA for the regular language, and make any valid state change into an error. See this for an example. What the page doesn't say is that it converted /(ac|bd)/ into /(a[^c]?|b[^d]?|[^ab])/. The conversion from a DFA back to a regular expression is not trivial. It is easier if you can use the reg...
Using “this” with class name
...ext where this would be ambiguous. The quote the JLS "It is a compile-time error if the expression occurs in a class or interface which is not an inner class of class T or T itself".
The second construct is called a class literal is the way to reference the Class object that represents that type. I...
Profiling Vim startup time
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This plugin does not work for neovim windows. The error message is No plugin found.
– jdhao
Apr 9 '19 at 5:31
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Read url to string in few lines of java code
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The 400 error is because you need a key to use this webservice. The problem is that this webservice send a bit of xml then take several seconds to do some processing and then send the second part of the xml. The InputStream is closed...
Difference between del, remove and pop on lists
...gt;> a = [4, 3, 5]
>>> a.pop(1)
3
>>> a
[4, 5]
Their error modes are different too:
>>> a = [4, 5, 6]
>>> a.remove(7)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: list.remove(x): x not in list
>>> de...
How Do I Get the Query Builder to Output Its Raw SQL Query as a String?
...query);
$result = $builder->get();
Or you can deliberately trigger an error, for example, by using a non-existent table or column. Then you can see the generated query in the exception message.
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Is there a Unix utility to prepend timestamps to stdin?
...he time that the end of the line appeared on its input pipe.
If awk shows errors, then try gawk instead.
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Mercurial undo last commit
...eration finishes succesfully, the transaction is marked as complete. If an error occurs, the transaction is "rolled back" and the repository is left in the same state as before.
You can manually trigger a rollback with 'hg rollback'. This will undo the last transactional command. If a pull command...
Link to reload current page
...lay the directory containing the current document, or it might generate an error, depending on other elements in the document and the server environment.
– Bohdan Lyzanets
Oct 2 '13 at 9:46
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