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How do I delete NuGet packages that are not referenced by any project in my solution?
...PagedList.Mvc
--- to uninstall a package named PagedList.MVC
Message
PM> Uninstall-Package PagedList.Mvc
Successfully removed 'PagedList.Mvc 4.5.0.0' from MCEMRBPP.PIR.
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Safely limiting Ansible playbooks to a single machine?
...
fail: msg="Single host check failed."
when: "{{ play_hosts|length }} != 1"
- debug: msg='I got executed!'
Run playbook with no host filters
$ ansible-playbook user.yml
PLAY [all] ****************************************************************
TASK: [Check for single host] ******...
Is it possible to decrypt MD5 hashes?
...1 explicitly says: "The algorithm takes as input a message of arbitrary length"
– Adam Batkin
Sep 5 '11 at 15:09
6
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How to subtract X days from a date using Java calendar?
...y calling:
Calendar calendar = Calendar.getInstance(); // this would default to now
calendar.add(Calendar.DAY_OF_MONTH, -5).
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Abort makefile if variable not set
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You can use an IF to test:
check:
@[ "${var}" ] || ( echo ">> var is not set"; exit 1 )
Result:
$ make check
>> var is not set
Makefile:2: recipe for target 'check' failed
make: *** [check] Error 1
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Memory management in Qt?
...s, so it is safe even when you delete child manually before the parent.) -> This is isn't the reason why it is safe. In Qt 4.7.4, QObject children get deleted directly (via delete, see qobject.cpp, line 1955). The reason why it is safe to delete child objects first is that a QObject tells its par...
Add Keypair to existing EC2 instance
...1-111-111-111 ~]$ chmod 700 .ssh
[john@ip-11-111-111-111 ~]$ cat john.pub > .ssh/authorized_keys
[john@ip-11-111-111-111 ~]$ chmod 600 .ssh/authorized_keys
[john@ip-11-111-111-111 ~]$ sudo chown john:ubuntu .ssh
In the above step, john is the user we created and ubuntu is the default user group...
How to change the name of the active scheme in Xcode?
... in the Xcode documentation available from the "Help" menu. Choose "Help" > "Xcode Help", then enter "rename scheme" to find it. Here are the steps:
Choose "Edit Scheme" from the "Product" menu.
Click on the "Manage Schemes…" button
Select the scheme whose name you wish to change
Press the "R...
Using ZXing to create an Android barcode scanning app [duplicate]
...cor-3.2.1.jar into the libs folder
Click on project: choose "properties" -> "Java Compiler" to change level to 1.7. Then click on "Android" change "Project build target" to android 4.4.2+, because using 1.7 requires compiling with Android 4.4
If "CameraConfigurationUtils.java" don't exist in "zxi...
Why use symbols as hash keys in Ruby?
..."
s.upcase!
h.rehash # must be called whenever a key changes!
h[s] # => nil, not "bar"
h.keys
h.keys.first.upcase! # => TypeError: can't modify frozen string
For string keys only, Ruby will use a frozen copy instead of the object itself.
2) The letters "b", "a", and "r" are stored only...