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Delete all lines beginning with a # from a file
All of the lines with comments in a file begin with # . How can I delete all of the lines (and only those lines) which begin with # ? Other lines containing # , but not at the beginning of the line should be ignored.
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Find all tables containing column with specified name - MS SQL Server
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Not surprising it works on all those different databases given that INFORMATION_SCHEMA is part of the ANSI Standard
– Davos
May 24 '18 at 4:42
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How can I get the diff between all the commits that occurred between two dates with Git?
Or just all the commits that occurred between two dates? In SVN, you could do something like
11 Answers
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How to export and import environment variables in windows?
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NOTE: This doesn't get all Environment Variables(EV)! I just did a command set path and messed up all my EV. I went to this registry and only the original EV were there. I did a system restore and got all my missing EV back to the PATH var. This re...
How to find a deleted file in the project commit history?
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If you do not know the exact path you may use
git log --all --full-history -- "**/thefile.*"
If you know the path the file was at, you can do this:
git log --all --full-history -- <path-to-file>
This should show a list of commits in all branches which touched that file....
How to initialize all the elements of an array to any specific value in java
...t() function which can fulfill my wish but in Java how can i initialize all the elements to a specific value? Whenever we write int[] array=new int[10]; , this simply initialize an array of size 10 having all elements equal to zero. I just want to change this initialization integer for one of m...
Database development mistakes made by application developers [closed]
...ng appropriate indices
This is a relatively easy one but still it happens all the time. Foreign keys should have indexes on them. If you're using a field in a WHERE you should (probably) have an index on it. Such indexes should often cover multiple columns based on the queries you need to execut...
How to reset a single table in rails?
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A lot of people (like me) come here to find how to delete all the data in the table. Here you go:
$ rails console
> ModelName.delete_all
or
> ModelName.destroy_all
destroy_all checks dependencies and callbacks, and takes a little longer.
delete_all is a straight SQL que...
How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...me (assuming the longest key is the longest english word) it can be essentially O(1) (in relation to the upper bound). Maybe the longest english word is 50 characters?
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UIScrollView Scrollable Content Size Ambiguity
...st sorted out in this way:
Inside the UIScrollView add a UIView (we can call that contentView);
In this contentView, set top, bottom, left and right margins to 0 (of course from the scrollView which is the superView); Set also align center horizontally and vertically;
Finished.
Now you can add ...