There are 2 mature popular terminal multiplexer apps: screen and tmux. Both of them are very useful if you want to work on multiple tasks over 1 SSH connection. Screen is relative simple to use while tmux is much more powerful and more complicated to use.
Besides enabling users to …
Cron tasks work in a Docker container.
However,
you have to manually start the cron deamon (root or sudo required) using cron or sudo cron
if it is not configured (via the Docker entrypoint) to start on the start of the Docker container.
For tutorials on crontab,
please refer to …
The order of precedence of operators in POSIX extended regular expression is as follows.
[==], [::], [..]\[]()*, +, ?, {m,n}^, $|Some regular expression patterns are defined using a single leading backslash,
e.g., \s, \b, etc.
However,
since special …
It is suggested that you use Python script instead of Shell script as much as possible.
If you do have to stick with Shell script,
you can use =~ for regular expression matching in Bash.
This make Bash syntax extremely flexible and powerful.
For example,
you can match multiple strings using …
The simplest way to check whether a Linux system is running systemd, upstart or SysV is by running the following command.
ps -p1 | grep "init\|upstart\|systemd"
How to determine which system manager is running on Linux System
I countered the issue when using PySpark locally
(the issue can happen to a cluster as well).
It turned out to be caused by a misconfiguration of the environment variable JAVA_HOME in Docker.
PySpark: Exception: Java gateway process exited before sending the driver its port number