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Check if an apt-get package is installed and then install it if it's not on Linux
...s upon finding that the package is missing, such as simply exiting with an error code.
REQUIRED_PKG="some-package"
PKG_OK=$(dpkg-query -W --showformat='${Status}\n' $REQUIRED_PKG|grep "install ok installed")
echo Checking for $REQUIRED_PKG: $PKG_OK
if [ "" = "$PKG_OK" ]; then
echo "No $REQUIRED_P...
How to run a shell script in OS X by double-clicking?
... you'll see the following symptoms:
.command: Finder displays a misleading error message that suggests the problem can be fixed via File > Get Info, which is not true - use the chmod +x method suggested above.
no suffix:
with a shebang line (e.g., #!/bin/bash): behavior is as if the suffix wer...
How to get an array of unique values from an array containing duplicates in JavaScript? [duplicate]
...again.
– Mark Knol
Feb 24 '15 at 22:05
49
...
How to enumerate a range of numbers starting at 1
... is straightforward to do in Python 2.6 or newer:
enumerate(range(2000, 2005), 1)
Python 2.5 and older do not support the start parameter so instead you could create two range objects and zip them:
r = xrange(2000, 2005)
r2 = xrange(1, len(r) + 1)
h = zip(r2, r)
print h
Result:
[(1, 2000), (...
linux: kill background task
... job. If a prefix matches more than one job, bash
reports an error. Using %?ce, on the other hand, refers to any job containing the string ce in its command line. If the
substring matches more than one job, bash reports an error. The symbols %% and %+ refer to the shell's n...
file_put_contents(meta/services.json): failed to open stream: Permission denied
... This should be sudo chmod -R 777 app/storage. to avoid permission error.
– Olaitan Mayowa
Oct 8 '14 at 10:10
5
...
App Inventor 2 App上架国内应用市场完整指南 · App Inventor 2 中文网
...目的。需要额外弹窗或蒙版信息，在询问是否允许的同时提示权限用途。
2.2 消息推送
如果App有消息推送功能的描述，就必须提供关闭推送的选项按钮
没有消息推送功能则去掉相关描述
2.3 注册/...
'Microsoft.SqlServer.Types' version 10 or higher could not be found on Azure
...blem (as types was already installed in my case). If anyone still gets the error after installing SQL Server Types, check this answer.
– Can Poyrazoğlu
Sep 23 '17 at 4:39
1
...
Apache: client denied by server configuration
... slightly earlier) added a new security feature that often results in this error. You would also see a log message of the form "client denied by server configuration". The feature is requiring an authorized user identity to access a directory. It is turned on by DEFAULT in the httpd.conf that ships ...
How to save/restore serializable object to/from file?
...}
NOTE: This code hasn't been compiled, let alone run- there may be some errors. Also, this assumes completely out-of-the-box serialization/deserialization. If you need custom behavior, you'll need to do additional work.
...