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How to read from a file or STDIN in Bash?
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The following solution reads from a file if the script is called
with a file name as the first parameter $1 otherwise from standard input.
while read line
do
echo "$line"
done < "${1:-/dev/stdin}"
The substitution ${1:-...} takes $1 if defined otherwise
the file name of t...
How does a public key verify a signature?
... add a digital signature to a document using his/her private key to essentially obtain a hash of the document, but what I do not understand is how the public key can be used to verify that signature.
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Failed to Attach to Process ID Xcode
...-> In the each simulator version of iOS -> Applications -> Delete all the files present here.
Now go to Products -> Clean
Now run it on any simulator and it will work.
Method 2 :
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How Big can a Python List Get?
...ents.
As long as the number of elements you have is equal or below this, all list functions should operate correctly.
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Real life example, when to use OUTER / CROSS APPLY in SQL
... ORDER BY pr.name) pa
ORDER BY pr.name,
pa.name
2) Calling a Table Valued Function for each row in the outer query
SELECT *
FROM sys.dm_exec_query_stats AS qs
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle)
3) Reusing a column alias
SELECT number,
doubled_number...
Tick symbol in HTML/XHTML
...splay a tick symbol (✓ or ✔) within an internal web app and would ideally like to avoid using an image.
14 Answers
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jQuery ID starts with
I am trying to get all elements with an id starting with some value. Below is my jQuery code. I am trying to use a JavaScript variable when searching for items. But it does not work. What am I missing below? So the id 'value' am searching is the value of the clicked element
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Difference between TCP and UDP?
...TCP is a connection oriented stream over an IP network. It guarantees that all sent packets will reach the destination in the correct order. This imply the use of acknowledgement packets sent back to the sender, and automatic retransmission, causing additional delays and a general less efficient tra...
How to set a default value for an existing column
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MSSQL is weird for calling default values "constraints". If anything, they are relaxations; the opposite of a constraint! They make more things valid, not fewer.
– Roman Starkov
May 11 '13 at 12:06
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Filter dataframe rows if value in column is in a set list of values [duplicate]
... regular expressions.
For example, if we want to return a DataFrame where all of the stock IDs which begin with '600' and then are followed by any three digits:
>>> rpt[rpt['STK_ID'].str.contains(r'^600[0-9]{3}$')] # ^ means start of string
... STK_ID ... ...