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Best practices with STDIN in Ruby?
...ion of obscure Ruby.
So, in Ruby, a simple no-bells implementation of the Unix command cat would be:
#!/usr/bin/env ruby
puts ARGF.read
ARGF is your friend when it comes to input; it is a virtual file that gets all input from named files or all from STDIN.
ARGF.each_with_index do |line, idx|
...
How can I search sub-folders using glob.glob module?
...('/path to directory/*/*.txt") working for me. This is bascially using the Unix shell rule.
– Surya
May 15 '16 at 21:09
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How can I troubleshoot my Perl CGI script?
...ript is not
readable and executable by the web server user. On flavors
of Unix, changing the mode to 755 is recommended:
chmod 755 filename. Never set a mode to 777!
Are you using use strict?
Remember that Perl automatically creates variables when
you first use them. This is a feature, but somet...
How do I install an R package from source?
...n Windows it will look something like this: "C:\\RJSONIO_0.2-3.tar.gz".
On UNIX it will look like this: "/home/blah/RJSONIO_0.2-3.tar.gz".
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How do you see the entire command history in interactive Python?
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This would be for Unix-like OSes. I was able to retrieve my history on macOS with cat ~/.python_history
– Ryan H.
Nov 8 '16 at 21:38
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Min/Max of dates in an array?
...
Since dates are converted to UNIX epoch (numbers), you can use Math.max/min to find those:
var maxDate = Math.max.apply(null, dates)
// convert back to date object
maxDate = new Date(maxDate)
(tested in chrome only, but should work in most browsers)
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Is there an ignore command for git like there is for svn?
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On Linux/Unix, you can append files to the .gitignore file with the echo command. For example if you want to ignore all .svn folders, run this from the root of the project:
echo .svn/ >> .gitignore
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How to automatically add user account AND password with a Bash script?
...ld The gecos field, or GECOS field is an entry in the /etc/passwd file on Unix, and similar operating systems. It is typically used to record general information about the account or its user(s) such as their real name and phone number. GECOS means General Electric Comprehensive Operating System,...
System.currentTimeMillis() vs. new Date() vs. Calendar.getInstance().getTime()
...ion of what time it is eg. 1,348,770,313,071 millis since the start of the Unix epoch. The time that nanoTime returns is relative (usually to the start of the program) and would be nonsense if you tried to turn it into a date.
– Dunes
Sep 27 '12 at 18:28
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Total size of the contents of all the files in a directory [closed]
...the du utility, this answer is correct. It is very similar to answer here: unix.stackexchange.com/a/471061/152606. But I would use ! -type d instead of -type f to count symlinks as well (the size of symlink itself (usually few bytes), not the size of the file it points to).
– a...