Homework for this week
DevOps Study Group: 11.17.22:
Assignment 1:
Find /usr/bin/ Pick one to 3 programs, run man command on them, and give a brief report on each of the 3 chosen commands.
I’m using Git Bash on Windows 10. Git Bash does not have the “man” command, but instead uses the “-help” flag. So, whereas in -UX (Linux, UNIX) style shells you might type:
man <somecommand>
, in Git Bash use
<somecommand> -help
COMMAND 1: gpgtar
gpgtar -help
gpgtar: encrypt or sign files into an archive. I was afraid to use it so I moved onto the next command.
COMMAND 2: find
find -help
Results were basically a list of “operators, options, tests, and actions”, so I explored the documentation URL provided in the help (https://www.gnu.org/software/findutils/) which led to another URL containing the examples
(https://www.gnu.org/software/findutils/manual/html_mono/find.html).
Find is used to make lists of files that match given criteria which can then have other commands run on that list. These are the flag and arg types that find accepts:
- options: affect overall operation rather than the
processing of a specific file; - tests: return a true or false value, depending on the
file’s attributes; - actions: have side effects and return a true or false
value; and - operators: connect the other arguments and affect when
and whether they are evaluated.
EX 1: Find all certificate files in /usr/
find /usr/ -name '*.crt'
EX 2: Find
Resources:
Assignment 2:
How to count in Binary
Assignment 3:
Read about UNIX / Linux FILE permissions and provide some examples
