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How do I test if a variable is a number in Bash?
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One approach is to use a regular expression, like so:
re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
echo "error: Not a number" >&2; exit 1
fi
If the value is not necessarily an integer, consider amending the regex appropriately; for instance:
^[0-9]+([.][0-9]+)?$
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Java 8 stream reverse order
...ect[] temp = input.toArray();
return (Stream<T>) IntStream.range(0, temp.length)
.mapToObj(i -> temp[temp.length - i - 1]);
}
Another technique uses collectors to accumulate the items into a reversed list. This does lots of insertions at the front of Ar...
How to resize the AVD emulator (in Eclipse)?
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107
From within Eclipse:
Go to Window > Android SDK and AVD Manager > Virtual Devices
Selec...
How to replace a character with a newline in Emacs?
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answered Mar 4 '09 at 23:52
Jonathan ArkellJonathan Arkell
9,45522 gold badges2222 silver badges3232 bronze badges
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How can I find script's directory with Python? [duplicate]
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edited Nov 12 '16 at 8:07
answered Feb 19 '12 at 16:10
C...
Apply style ONLY on IE
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103
Update 2017
Depending on the environment, conditional comments have been officially deprecate...
jQuery selector for the label of a checkbox
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answered Jul 27 '09 at 4:23
KipKip
95.8k8080 gold badges220220 silver badges256256 bronze badges
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Can I draw rectangle in XML?
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230
Yes you can and here is one I made earlier:
<?xml version="1.0" encoding="UTF-8"?>
<sh...
Git: how to reverse-merge a commit?
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106
To create a new commit that 'undoes' the changes of a past commit, use:
$ git revert <commi...
Setting a timeout for socket operations
...et = new Socket();
socket.connect(new InetSocketAddress(ipAddress, port), 1000);
Quoting from the documentation
connect
public void connect(SocketAddress endpoint, int timeout) throws IOException
Connects this socket to the server with a specified timeout value. A timeout of zero is i...