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Server is already running in Rails
When I am starting rails server using rails s command it is showing A server is already running. Check C:/Sites/folder/Pids/Server.pids
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Removing empty lines in Notepad++
How can I replace empty lines in Notepad++? I tried a find and replace with the empty lines in the find, and nothing in the replace, but it did not work; it probably needs regex.
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How to read from standard input in the console?
I would like to read standard input from the command line, but my attempts have ended with the program exiting before I'm prompted for input. I'm looking for the equivalent of Console.ReadLine() in C#.
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How to get overall CPU usage (e.g. 57%) on Linux [closed]
I am wondering how you can get the system CPU usage and present it in percent using bash, for example.
5 Answers
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How to convert a string to lower case in Bash?
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The are various ways:
POSIX standard
tr
$ echo "$a" | tr '[:upper:]' '[:lower:]'
hi all
AWK
$ echo "$a" | awk '{print tolower($0)}'
hi all
Non-POSIX
You may run into portability issues with the following examples:
Bash 4.0
$ echo "${a,,}"
hi all...
Convert timestamp to date in MySQL query
...in PHP (date('Y-m-d',$row->user_created_at)) - this (both variants, SQL and PHP) shows up as 2018-11-06
– Chris S.
Nov 7 '18 at 9:19
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What are good uses for Python3's “Function Annotations”
...tions, threads that are allowed to access, architecture limitations, etc., and there are quite a few tools that can then read these and process them to provide assurances beyond what you get from the compilers. You could even write things that check preconditions/postconditions.
I feel something l...
“f” after number
...compiler may not be smart enough to convert them to float at compile time, and would slow the execution down with four int->float conversions (that are among the slowest casts). Although in this case is almost unimportant, it's always better to specify correctly f if needed: in an expression a co...
How to configure an existing git repo to be shared by a UNIX group
...sets some important variables in repodir/config ("core.sharedRepository=2" and "receive.denyNonFastforwards=true")
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How can I escape square brackets in a LIKE clause?
... I corrected the other part of the answer too. SQL Fiddle with before and after versions
– Martin Smith
Oct 31 '12 at 22:20
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