Exercises 2

  • How can I check my disk space.
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/primary-root   47G  8.8G   36G  20% /
  • How can I create a folder structure using only one command ?
my-app/
├── config
├── logs
└── utils
  • metasyntactic-vars has 4 lines, on what line is buz located, print also one line above and one below (2 commands exmples with grep).
Desired output:
1-foo
2:bar
3-buz

  • metasyntactic-vars has 4 lines, How do one create a new file without the last 2 lines ?

    • use > to redirect the output to a new file
    • use >> to append the output to a new file

  • my screenshot folder requires clean-up i want to find all png files that are older than 1 day, what about once found how can i remove them ?

  • given below file structure how do i remove any other file that is not metasyntactic-vars, what about files from 3 to 5 ?

$ mkdir -p /tmp/test && cd /tmp/test
$ echo -e "foo \nbar \nbuz \nquz" > metasyntactic-vars
$ for i in {1..5} ; do cp metasyntactic-vars metasyntactic-vars.${i}.log ;done
$ ls
metasyntactic-vars
metasyntactic-vars.1.log
metasyntactic-vars.2.log
metasyntactic-vars.3.log
metasyntactic-vars.4.log
metasyntactic-vars.5.log

  • /etc/groups is the system file that stores user group information. Hou can i print/filter the groups that user packer is part of ?

  • /etc/passwd is the system file that stores user information. Hou can i print each user’s login shell ? (stored on the last column)