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How do I test if a variable is a number in Bash?
...ion, like so:
re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
echo "error: Not a number" >&2; exit 1
fi
If the value is not necessarily an integer, consider amending the regex appropriately; for instance:
^[0-9]+([.][0-9]+)?$
...or, to handle numbers with a sign:
^[+-]?[0-9]+([.]...
Http 415 Unsupported Media type error with JSON
... a JSON request and it responds with a HTTP 415 "Unsupported Media Type" error.
15 Answers
...
How do I install jmeter on a Mac?
....com/pub/apache/jmeter/binaries/… curl: (22) The requested URL returned error: 404 Not Found Error: Failed to download resource "jmeter" Download failed: mirror.cogentco.com/pub/apache/jmeter/binaries/…
– tk_
Nov 24 '14 at 5:48
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Android: Test Push Notification online (Google Cloud Messaging) [closed]
...s, device registration id has been changed mainly due to app re-install
{ "error": "Unavailable" } - Server not available, resend the message
{ "error": "InvalidRegistration" } - Invalid device registration Id
{ "error": "NotRegistered"} - Application was uninstalled from the device
...
What is the purpose of Rank2Types?
... typecheck (although some functions that go into infinite loops or produce errors and therefore never return will do so).
The above is contrived, of course, but a variation on this technique is key to making the ST monad safe.
...
How to directly initialize a HashMap (in a literal way)?
...u want to?
– yankee
Aug 16 '15 at 8:05
6
and for the cases when you need a Map with a single entr...
Bash script error [: !=: unary operator expected
In my script I am trying to error check if the first and only argument is equal to -v but it is an optional argument. I use an if statement but I keep getting the unary operator expected error.
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How to deal with “data of class uneval” error from ggplot2?
...ying to overlay a new line to a existing ggplot I am getting the following error:
3 Answers
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How to round up to the nearest 10 (or 100 or X)?
...nding value y:
# Round(1.3,1) = 1 while Round(1.6,1) = 2
# Round(1.024,0.05) = 1 while Round(1.03,0.05) = 1.05
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How can I get a file's size in C? [duplicate]
...
Please note that I have omitted error checking in the interest of clarity.
– Greg Hewgill
Oct 26 '08 at 21:23
19
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