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Search and replace in bash using regular expressions
...NNNXNNXNNNNXXXXXXNNNNNXXX
Note that the subsequent -e's are processed in order. Also, the g flag for the expression will match all occurrences in the input.
You can also pick your favorite tool using this method, i.e. perl, awk, e.g.:
echo "$MYVAR" | perl -pe 's/[a-zA-Z]/X/g and s/[0-9]/N/g'
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Change the maximum upload file size
...it shows you which one are you using! So There you need to make changes in order to take effect!
– lewis4u
Jul 6 '17 at 15:26
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What is a “thread” (really)?
...struction Pointer (aka Program Counter), it controls what executes in what order. It also includes the Stack Pointer, which had better point to a unique area of memory for each thread or else they will interfere with each other.
Threads are the software unit affected by control flow (function call...
what is the basic difference between stack and queue?
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You can think of both as an ordered list of things (ordered by the time at which they were added to the list). The main difference between the two is how new elements enter the list and old elements leave the list.
For a stack, if I have a list a, b, c...
What is a web service endpoint?
...lication. The same web service can have multiple endpoints, for example in order to make it available using different protocols.
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Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
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There are multiple reasons why the C compiler cannot automatically reorder the fields:
The C compiler doesn't know whether the struct represents the memory structure of objects beyond the current compilation unit (for example: a foreign library, a file on disc, network data, CPU page tables,...
Practical uses of different data structures [closed]
...ow much work it takes to find a value, add a new value, find all values in order, etc.
There are various texts on analyzing algorithms / data structure performance that people recommend, but what really made them make sense to me was learning OCaml. Dealing with complex data structures is ML's stro...
map vs. hash_map in C++
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They are implemented in very different ways.
hash_map (unordered_map in TR1 and Boost; use those instead) use a hash table where the key is hashed to a slot in the table and the value is stored in a list tied to that key.
map is implemented as a balanced binary search tree (usuall...
Undefined behavior and sequence points
...haviour and Implementation Defined Behaviour.
You must also know that the order of evaluation of operands of individual operators and subexpressions of individual expressions, and the order in which side effects take place, is unspecified.
For example:
int x = 5, y = 6;
int z = x++ + y++; //it i...
How do I migrate a model out of one django app and into a new one?
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In order to access orm['contenttypes.contenttype'], you also need to add the --freeze contenttypes option to your schemamigration commands.
– Gary
Dec 5 '13 at 18:21
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