There are many interesting while at the same time very tricky problems in statistics. One famous question is that how many steps (expected) does it take to observe a given sequence (e.g. THTH, TTHH), if we flip a balanced coin?
This problem can be solved using (delay) renewal theory …
My first choice is pandas in Python. However, below are some tools for quick and dirty solutions.
q -t -H 'select c1, c3 from file.txt'
cut -d\t -f1,3 file.txt
awk -F'\t' '{print $1 "\t" $3}' file.tsv
Note: neither cut …
NOTE: the article talks about sampling "lines" rather than "records".
If a records can occupy multiple lines,
e.g., if any field contains a new line (\n),
the following tutorial does not work
and you have to fall back to more powerful tools such as Python or R.
Let's say …
** Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement! **
Both adduser and useradd can be used to create a new user.
adduser is interactive while useradd is non-interactive.
It is suggested that you use useradd in batch …
Get information of the staff group.
$ getent group staff
staff:x:20:
Get group ID of the staff group.
$ getent group staff | cut -d: -f3
20
Get information of the staff group.
$ dscl . -read /Groups/staff
Get group ID of the staff group.
$ dscl . -read /Groups/staff | awk …You can list running Jupyter Notebook servers using the following command.
jupyter notebook list
It works well most of the time. However, if the servers are launched using the root account (e.g., in a Docker container), you might encounter issues. In this case, a better alternative is to list …