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How to show line number when executing bash script
...on currently executing).
For example, if your script reads:
$ cat script
foo=10
echo ${foo}
echo $((2 + 2))
Executing it thus would print line numbers:
$ PS4='Line ${LINENO}: ' bash -x script
Line 1: foo=10
Line 2: echo 10
10
Line 3: echo 4
4
http://wiki.bash-hackers.org/scripting/debuggingti...
How can I grep hidden files?
...e with this output format:
File path:Line number:line with coincidence
./foo/bar:42:search line
./foo/.bar:42:search line
./.foo/bar:42:search line
./.foo/.bar:42:search line
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PostgreSQL - how to quickly drop a user with existing privileges
...
Doing: CREATE TABLE foo(bar SERIAL); ALTER TABLE foo OWNER TO postgres; CREATE USER testuser; GRANT ALL ON foo TO testuser; DROP USER testuser gave the error messages: ERROR: role "testuser" cannot be dropped because some objects depend on it...
How do I concatenate const/literal strings in C?
...d allows you to chain the calls into one line of code:
strcat(strcat(str, foo), bar);
So your problem could be solved as follows:
char *foo = "foo";
char *bar = "bar";
char str[80];
strcpy(str, "TEXT ");
strcat(str, foo);
strcat(str, bar);
...
How do you push just a single Git branch (and no other branches)?
... Thanks, current was what I was looking for, by default git push in the foo branch will push it to the origin/foo branch.
– Dorian
Feb 25 '14 at 14:51
...
What does tree-ish mean in Git?
...irectories as "trees" and "tree objects").
In the original poster's case, foo is a directory that he wants to
specify. The correct way to specify a (sub)directory in Git is to use this
"tree-ish" syntax (item #15 from the Git revisions documentation):
<rev>:<path>, e.g. HEAD:README,...
How can I reset or revert a file to a specific revision?
...
git checkout -- foo
That will reset foo to HEAD. You can also:
git checkout HEAD^ foo
for one revision back, etc.
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API pagination best practices
...ut have you considered paginating with a timestamp field?
When you query /foos you get 100 results. Your API should then return something like this (assuming JSON, but if it needs XML the same principles can be followed):
{
"data" : [
{ data item 1 with all relevant fields },
...
How do I reverse a C++ vector?
...tems along for every insertion.) So as opposed to:
std::vector<int> foo;
int nextItem;
while (getNext(nextItem)) {
foo.push_back(nextItem);
}
std::reverse(foo.begin(), foo.end());
You can instead do:
std::deque<int> foo;
int nextItem;
while (getNext(nextItem)) {
foo.push_fron...
How to avoid isset() and empty()
...uation there are different ways to do that:
Function arguments:
function foo ($bar, $baz = null) { ... }
There's no need to check whether $bar or $baz are set inside the function because you just set them, all you need to worry about is if their value evaluates to true or false (or whatever else...