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What are the uses of the exec command in shell scripts? [closed]
...profile, the last statement says something like:
exec appln-program
so now there is no shell to go back to. Even if appln-program crashes, the end-user cannot get to a shell, because it is not there - the exec replaced it.
We want to use a different shell to the one in /etc/passwd. Stupid as ...
Implementing Fast and Efficient Core Data Import on iOS 5
... should not be updated, but we need to reload the data as well
}];
}
Now, for what may be your real issue regarding the hang... you show two different calls to save on the master. the first is well protected in its own performBlock, but the second is not (though you may be calling saveMaster...
Simple basic explanation of a Distributed Hash Table (DHT)
...key is found by hashing that key, so in effect your hash-table buckets are now independent nodes in a network.
This gives a lot of fault-tolerance and reliability, and possibly some performance benefit, but it also throws up a lot of headaches. For example, what happens when a node leaves the netwo...
Operator precedence with Javascript Ternary operator
...
I know this is a very old question, but I am not 100% happy with any of the answers as they all seem incomplete. So here we go again from first principals:
The user's overall aim:
Summarising the code: "I wish to add an error ...
What is the easiest way to get the current day of the week in Android?
... (for today):
Sat
Saturday
UPDATE: java8
LocalDate date = LocalDate.now();
DayOfWeek dow = date.getDayOfWeek();
System.out.println("Enum = " + dow);
String dayName = dow.getDisplayName(TextStyle.FULL, Locale.ENGLISH);
System.out.println("FULL = " + dayName);
dayName = dow.getDisplayName(Tex...
The remote end hung up unexpectedly while git cloning
...n effect, and in this instance, the OP Joe reports:
[clone] works fine now
Note: if something went wrong on the server side, and if the server uses Git 2.5+ (Q2 2015), the error message might be more explicit.
See "Git cloning: remote end hung up unexpectedly, tried changing postBuffer but s...
How do you delete a column by name in data.table?
...hough data.table is gradually moving away from using this argument so it's now discouraged where you can avoid it; showing here so you know the option exists in case you really do need it:
# Method 5a (like Method 3)
df3[, !"foo", with=FALSE]
# Method 5b (like Method 4)
df3[, !grep("^foo$", names(...
How do you print in a Go test using the “testing” package?
...output after a certain amount of time (e.g., 10 minutes in CircleCI).
So now my tests are killed and I have nothing in the logs to tell me what happened.
But for (possibly) Go 1.14 (Q1 2020): CL 127120
testing: stream log output in verbose mode
The output now is:
=== RUN TestFoo
=== ...
CSS @font-face - what does “src: local('☺')” mean?
...excerpt from his blog post:
And.. regarding @font-face syntax
I now recommend the bulletproof smiley variation over the original bulletproof syntax.
@font-face {
font-family: 'Graublau Web';
src: url('GraublauWeb.eot');
src: local('☺'),
url('GraublauWeb.woff') format('woff...
Execute and get the output of a shell command in node.js
...
Thats the way I do it in a project I am working now.
var exec = require('child_process').exec;
function execute(command, callback){
exec(command, function(error, stdout, stderr){ callback(stdout); });
};
Example: Retrieving git user
module.exports.getGitUser = func...