It is suggested that you use Python instead of Shell to manipulate text files!
Please refer to
Advanced Use of "head" and "tail"
on how to use head and tail for printing rows from a text file.
These 2 commands are convenient when you want to take head/tail rows …
You can list files sorted by time (newest first) using the -t option.
Notice that the -t option is also support by hdfs dfs -ls.
ls -lht
You have to either enclose the pattern in quotes or escape the wildcard in patterns.
Equivalent …
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 …
If the docker container was started using /bin/bash
(you can check using docker ps) command you can access it using attach.
docker attach container_name_or_id
If the docker container was started but not with /bin/bash,
you have to create a bash instance inside the container using exec.
docker exec …