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How can I negate the return-value of a process?
...rator. For example, it is listed as a reserved word and can appear at the start of a pipeline — where a simple command is a special case of 'pipeline'. It can, therefore, be used in if statements and while or until loops too — in POSIX-compliant shells. Consequently, despite my reservations, ...
Test a weekly cron job [closed]
...og ]] && rm -f $crontestLog
parseArgs "$@"
log "crontest starting at $(date)"
log "Raw command line: $@"
log "Inner args: $@"
log "screenBin: $screenBin"
log "useBashdb: $( if $useBashdb; then echo YES; else echo no; fi )"
log "useScreen: $( if $useScreen; then ...
How to implement Enums in Ruby?
...Ruby, but I do not feel comfortable refactoring in Ruby. And now that I've started writing unit tests (finally), I realize that they are not a panacea: my guess is 1) that Ruby code doesn't get massively refactored that often, in practice and 2) Ruby is not the end-of-the-line in terms of dynamic la...
How to handle command-line arguments in PowerShell
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You are reinventing the wheel. Normal PowerShell scripts have parameters starting with -, like script.ps1 -server http://devserver
Then you handle them in param section in the beginning of the file.
You can also assign default values to your params, read them from console if not available or sto...
How to iterate over associative arrays in Bash
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@pkaramol: Starting in Bash 4.3 you can use namerefs. Example: declare -A aa; aa['A']=a1; aa['B']=b2; aa['C']=c3; foo () { declare -n assoc=$1; for key in "${!assoc[@]}"; do echo "Key: $key; Value: ${assoc[$key]}"; done; }; foo aa. Plea...
Career day in kindergarten: how to demonstrate programming in 20 minutes? [closed]
...ing the exercise, but there has to be a break in the line somewhere. Then, starting at one end of the line, get them to take turns doing "if the classmate on your left is taller than you, switch places; otherwise, stay put." The game ends when you go through the line and no one switches places. Get ...
Protected in Interfaces
...n a
private class, so they remain private.
An alternative available starting in Java 9 is to make classes and
methods public, but within a module that has a qualified-export to
specific "friend" modules instead of being exported to the general
public.
So the authoritative takeaways fr...
printf with std::string?
...illed by divs. As Dykstra wrote later about the goto, he didn't intend to start a religion and was really only arguing against using it as a kludge to make up for poorly-designed code.
It would be quite nice if the GNU project would add the printf family to their g++ extensions.
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How do I get the number of elements in a list?
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In Python, names that start with underscores are semantically non-public methods and should not be used by users.
– Aaron Hall♦
Oct 26 '16 at 15:10
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How can I get the intersection, union, and subset of arrays in Ruby?
...Obviously I didn't implement the MultiSet to spec, but this should get you started:
class MultiSet
attr_accessor :set
def initialize(set)
@set = set
end
# intersection
def &(other)
@set & other.set
end
# difference
def -(other)
@set - other.set
end
# union
...