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What's the difference between Perl's backticks, system, and exec?
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exec
executes a command and never returns.
It's like a return statement in a function.
If the command is not found exec returns false.
It never returns true, because if the command is found it never returns at all.
There is also no point ...
Change case of a file on Windows?
... becomes SourceCode.java , for example. The catch: I'm on a Windows box, and the filesystem thinks those are the same file name.
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What's better at freeing memory with PHP: unset() or $var = null
...is garbage-collected.) (bug 33595)
The question "difference between unset and = null" details some differences:
unset($a) also removes $a from the symbol table; for example:
$a = str_repeat('hello world ', 100);
unset($a);
var_dump($a);
Outputs:
Notice: Undefined variable: a in xxx
NULL
But ...
ASP.NET Temporary files cleanup
...y .NET applications you run on the server.
For background, see the Understanding ASP.NET dynamic compilation article on MSDN.
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find -exec cmd {} + vs | xargs
Which one is more efficient over a very large set of files and should be used?
3 Answers
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Rename a git submodule
...le directory (other than going through the entire motion of deleting it and re-adding it with a new destination name).
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Use Expect in a Bash script to provide a password to an SSH command
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Mixing Bash and Expect is not a good way to achieve the desired effect. I'd try to use only Expect:
#!/usr/bin/expect
eval spawn ssh -oStrictHostKeyChecking=no -oCheckHostIP=no usr@$myhost.example.com
# Use the correct prompt
set prompt...
How can I shift-select multiple checkboxes like GMail?
...user can click on one checkbox in the email list, hold down the Shift key, and select a second checkbox. The JavaScript will then select/unselect the checkboxes that are between the two checboxes.
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What are the undocumented features and limitations of the Windows FINDSTR command?
The Windows FINDSTR command is horribly documented. There is very basic command line help available through FINDSTR /? , or HELP FINDSTR , but it is woefully inadequate. There is a wee bit more documentation online at https://docs.microsoft.com/en-us/windows-server/administration/windows-commands...
Synchronise ScrollView scroll positions - android
I have 2 ScrollViews in my android layout. How can I synchronise their scroll positions?
4 Answers
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