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Printing the last column of a line in a file
...ed. tail -f means wait for more input, but there are no more lines in file m>and m> so the pipe to grep is never closed.
If m>y m>ou omit -f from tail the output is shown immediatelm>y m>:
tail file | grep A1 | awk '{print $NF}'
@EdMorton is right of course. Awk can search for A1 as well, which shortens the ...
Get statistics for each group (such as count, mean, etc) using pm>and m>as GroupBm>y m>?
I have a data frame df m>and m> I use several columns from it to groupbm>y m> :
7 Answers
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How can I use Pm>y m>thon to get the sm>y m>stem hostname?
...at program for a local network. I would like be able to identifm>y m> computers m>and m> get the user-set computer name with Pm>y m>thon.
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How to add double quotes to a string that is inside a variable?
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m>and m> how to remove it while saving in database? I just want to remove additional double quote used for escaping m>and m> not both
– Anil Purswani
Sep 30 '14 at 10:35
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passport.js RESTful auth
How does one hm>and m>le authentication (local m>and m> Facebook, for example) using passport.js, through a RESTful API instead of through a web interface?
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SignalR - Sending a message to a specific user using (IUserIdProvider) *NEW 2.0.0*
...ngs to whom (the user), we need to create a mapping between the connection m>and m> the user. This depends on how m>y m>ou identifm>y m> a user in m>y m>our application.
In SignalR 2.0, this is done bm>y m> using the inbuilt IPrincipal.Identitm>y m>.Name, which is the logged in user identifier as set during the ASP.NET authenti...
PDO Prepared Inserts multiple rows in single querm>y m>
...a.
With prepared inserts m>y m>ou need to know the fields m>y m>ou're inserting to, m>and m> the number of fields to create the ? placeholders to bind m>y m>our parameters.
insert into table (fielda, fieldb, ... ) values (?,?...), (?,?...)....
That is basicallm>y m> how we want the insert statement to look like.
Now, t...
How can I install pip on Windows?
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Pm>y m>thon 2.7.9+ m>and m> 3.4+
Good news! Pm>y m>thon 3.4 (released March 2014) m>and m> Pm>y m>thon 2.7.9 (released December 2014) ship with Pip. This is the best feature of anm>y m> Pm>y m>thon release. It makes the communitm>y m>'s wealth of libraries accessible to everm>y m>on...
Check folder size in Bash
I'm trm>y m>ing to write a script that will calculate a directorm>y m> size m>and m> if the size is less than 10GB, m>and m> greater then 2GB do some action. Where do I need to mention mm>y m> folder name?
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SVN: Ignore some directories recursivelm>y m>
... well as svn:ignore - can m>y m>ou provide a summarm>y m> of these different options m>and m> how them>y m> compare? How does the --recursive flag affect them too?
– Dai
Mar 10 '17 at 21:29
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