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Node.js check if file exists
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A easier way to do this synchronously.
if (fs.existsSync('/etc/file')) {
console.log('Found file');
}
The API doc says how existsSync work:
Test whether or not the given path exists by checking with the file system.
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Calling Java varargs method with single null argument?
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The ordering for method overloading resolution is (https://docs.oracle.com/javase/specs/jls/se11/html/jls-15.html#jls-15.12.2):
The first phase performs overload resolution without permitting boxing or unboxing conversion,...
How to find a table having a specific column in postgresql
...('information_schema', 'pg_catalog')
and t.table_type = 'BASE TABLE'
order by t.table_schema;
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How to get the instance id from within an ec2 instance?
...dvanced use (retrieve instance ID as well as availability zone and region, etc.):
EC2_INSTANCE_ID="`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"
test -n "$EC2_INSTANCE_ID" || die 'cannot obtain instance-id'
EC2_AVAIL_ZONE="`wget -q -O...
Vertically align text next to an image?
...>
</div>
If you must support ancient versions of IE <= 7
In order to get this to work correctly across the board, you'll have to hack the CSS a bit. Luckily, there is an IE bug that works in our favor. Setting top:50% on the container and top:-50% on the inner div, you can achieve the...
C++ sorting and keeping track of indexes
...ly the standard library, I want to sort a sequence of samples in ascending order, but I also want to remember the original indexes of the new samples.
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window.onload vs
...l of the common JavaScript libraries, Prototype, ExtJS, Dojo, JQuery, YUI, etc. provide nice wrappers around events that occur as the document is loaded. You can listen for the window onLoad event, and react to that, but onLoad is not fired until all resources have been downloaded, so your event han...
In Bash, how to add “Are you sure [Y/n]” to any command or alias?
...want to continue? <y/N> " prompt
if [[ $prompt =~ [yY](es)* ]]
then
(etc...)
That tests whether the user input starts with 'y' or 'Y' and is followed by zero or more 'es's.
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Android: When is onCreateOptionsMenu called during Activity lifecycle?
... case on Android 2.3 and with FragmentActivity from v4-support library the order of life-cycle methods invoke is following:
07-18 18:29:21.629 20183-20183/? I/onCreate:
07-18 18:29:21.719 20183-20183/? I/onStart:
07-18 18:29:21.719 20183-20183/? I/onResume:
07-18 18:29:21.739 20183-20183/? I...
adito-gateway -华为云免费SSL VPN解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...录到堡垒机了
最精简后运行的命令记录
1 vi /etc/hosts
2 vi /etc/sysconfig/network
3 vi /etc/sysconfig/network-scripts/ifcfg-eth0 t
4 reboot
5 cd /mnt/
6 ls
7 unzip adito-0.9.1-bin.zip
8 unzip apache-ant-1.9.6-bin.zip
9 tar ...