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Linux: compute a single hash for a given folder & contents?
...bly faster than sha1sum | sha1sum. YMMV, try each of these on your system: time find path/to/folder -type f -print0 | sort -z | xargs -0 sha1sum | sha1sum; time find path/to/folder -type f -print0 | sort -z | xargs -0 cat | sha1sum
– Bruno Bronosky
Apr 28 '11 a...
Stack, Static, and Heap in C++
... itself. There is only one copy for the entire program. No matter how many times you go into a function call (or class) (and in how many threads!) the variable is referring to the same memory location.
The heap is a bunch of memory that can be used dynamically. If you want 4kb for an object then th...
Convert java.util.Date to String
...e today date using Calendar object.
Date today = Calendar.getInstance().getTime();
// Using DateFormat format method we can create a string
// representation of a date with the defined format.
String todayAsString = df.format(today);
// Print the result!
System.out.println("Today is: " + t...
Track the time a command takes in UNIX/LINUX?
In UNIX/LINUX, is there an easy way to track the time a command takes?
3 Answers
3
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How do SQL EXISTS statements work?
I'm trying to learn SQL and am having a hard time understanding EXISTS statements. I came across this quote about "exists" and don't understand something:
...
How can I shuffle the lines of a text file on the Unix command line or in a shell script?
...ely different. sort -R is deterministic. If you call it twice at different times on the same input you will get the same answer. shuf, on the other hand, produces randomized output, so it will most likely give different output on the same input.
– EfForEffort
F...
sed one-liner to convert all uppercase to lowercase?
...camelcase a sentence:
$ sed -r 's/\w+/\u&/g' <<< "Now is the time for all good men..." # Camel Case
Now Is The Time For All Good Men...
Note: Since the assumption is we have GNU extensions, we can also use the dash-r (extended regular expressions) option, which allows \w (word chara...
How to format time since xxx e.g. “4 minutes ago” similar to Stack Exchange sites
The question is how to format a JavaScript Date as a string stating the time elapsed similar to the way you see times displayed on Stack Overflow.
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Python list directory, subdirectory, and files
..., i'd like to show a nice example and comparison with listdir:
import os, time
def listFiles1(root): # listdir
allFiles = []; walk = [root]
while walk:
folder = walk.pop(0)+"/"; items = os.listdir(folder) # items = folders + files
for i in items: i=folder+i; (walk if os.pat...
How do you get assembler output from C/C++ source in gcc?
...best if debugging option is enabled for the object file (-g at compilation time) and the file hasn't been stripped.
Running file helloworld will give you some indication as to the level of detail that you will get by using objdump.
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