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How to print matched regex pattern using awk?
...is is the very basic
awk '/pattern/{ print $0 }' file
ask awk to search for pattern using //, then print out the line, which by default is called a record, denoted by $0. At least read up the documentation.
If you only want to get print out the matched word.
awk '{for(i=1;i<=NF;i++){ if($i=...
Pandas: drop a level from a multi-level column index?
...y to drop the index is to use a list comprehension:
df.columns = [col[1] for col in df.columns]
b c
0 1 2
1 3 4
This strategy is also useful if you want to combine the names from both levels like in the example below where the bottom level contains two 'y's:
cols = pd.MultiIndex.from_t...
More elegant “ps aux | grep -v grep”
When I check list of processes and 'grep' out those that are interesting for me, the grep itself is also included in the results. For example, to list terminals:
...
laravel throwing MethodNotAllowedHttpException
... their docs are not making it easy! Anyways, I am trying to create a login form and just make sure that data is posted successfully by printing it in the next form. I am getting this exception:
...
How to save/restore serializable object to/from file?
...objects and I need to save that somewhere in my computer. I have read some forums and I know that the object has to be Serializable . But it would be nice if I can get an example. For example if I have the following:
...
How to customize ?
...o {
opacity: 0;
position: absolute;
z-index: -1;
}
<label for="upload-photo">Browse...</label>
<input type="file" name="photo" id="upload-photo" />
The CSS for the form control will make it appear invisible and not take up space in the document layout, but wil...
Detecting touch screen devices with Javascript
...
+1 for doing hover and click both. One other way could be using CSS media queries and using some styles only for smaller screens / mobile devices, which are the ones most likely to have touch / tap functionality. So if you have ...
Are there any suggestions for developing a C# coding standards / best practices document? [closed]
I'm a recent AI graduate (circa 2 years) working for a modest operation. It has fallen to me (primarily as I'm the first 'adopter' in the department) to create a basic (read useful?) C# coding standards document.
...
Unlink of file failed
...d "git repack" did not close the open packfiles that they found unneeded before removing them, which didn't work on a platform incapable of removing an open file.
This has been corrected.
See commit 5bdece0 (15 Dec 2018) by Johannes Schindelin (dscho).
(Merged by Junio C Hamano -- gitster -- in com...
Get the date (a day before current time) in Bash
How can I print the date which is a day before current time in Bash?
17 Answers
17
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