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Correct way to detach from a container without stopping it
...
A little lesson about docker.
The container is not a real full functional OS. When you run a container the process you launch take the PID 1 and assume init power. So when that process is terminated the daemon stop the container until a new process is launched (via docker start) (More explanation o...
Sleep until a specific time/date
...ch - $current_epoch ))
sleep $sleep_seconds
To add precision down to nanoseconds (effectively more around milliseconds) use e.g. this syntax:
current_epoch=$(date +%s.%N)
target_epoch=$(date -d "20:25:00.12345" +%s.%N)
sleep_seconds=$(echo "$target_epoch - $current_epoch"|bc)
sleep $sleep_seco...
Deleting lines from one file which are in another file
... I just tried this on 2 files of ~2k lines each, and it got killed by the OS (granted, this is a not-so-powerful VM, but still).
– Trebor Rude
Feb 18 '14 at 1:45
2
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Where are static methods and static variables stored in Java?
...he normal sections of the heap (young/old generation or survivor space). Those objects (unless they are internal objects like classes etc.) are not stored in PermGen space.
Example:
static int i = 1; //the value 1 is stored in the PermGen section
static Object o = new SomeObject(); //the reference...
How To Set Up GUI On Amazon EC2 Ubuntu server
... -A INPUT -p tcp --dport 5901 -j ACCEPT
If the grey window issue comes. Mostly because of ".vnc/xstartup" file on different user. So run the vnc server also on same user instead of "awsgui" user.
vncserver
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Conditional Variable vs Semaphore
...synchronized access to shared resources. They can be used for similar purposes.
A condition variable is generally used to avoid busy waiting (looping repeatedly while checking a condition) while waiting for a resource to become available. For instance, if you have a thread (or multiple threads)...
Git Push Error: insufficient permission for adding an object to repository database
...t the following error:
insufficient permission for adding an object to repository database
19 Answers
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How to tell if JRE or JDK is installed
...VA_HOME to my bash profile (.bashrc, .bash_profile, etc. depending on your OS) like below:
JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64"
Here you go!
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Search for executable files using find command
...ny execute permissions are set": It means that -perm +111 may yield false positives, i.e., files that the current user cannot actually execute. There's no way to emulate -executable by testing permissions alone, because what's needed is to relate the file's user and group identity to the current use...
How to change the style of the title attribute inside an anchor tag?
...hed;
text-decoration: none
}
a.tip:hover {
cursor: help;
position: relative
}
a.tip span {
display: none
}
a.tip:hover span {
border: #c0c0c0 1px dotted;
padding: 5px 20px 5px 5px;
display: block;
z-index: 100;
background: url(../images/status-info....