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feat(details): add subject, test and solution for the exercise

pull/1739/head
miguel 2 years ago committed by MSilva95
parent
commit
e298d48ed9
  1. 18
      sh/tests/details_test.sh
  2. 3
      sh/tests/solutions/details.sh
  3. 97
      subjects/devops/details/README.md

18
sh/tests/details_test.sh

@ -0,0 +1,18 @@
#!/usr/bin/env bash
# Unofficial Bash Strict Mode
set -euo pipefail
IFS='
'
script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)
challenge() {
touch file1.txt
submitted=$(bash "$script_dirS"/student/details.sh && ls -l file1.txt | awk '{print $1, $2, $5, $6, $7, $8, $9}')
expected=$(bash "$script_dirS"/solutions/details.sh && ls -l file1.txt | awk '{print $1, $2, $5, $6, $7, $8, $9}')
diff <(echo "$submitted") <(echo "$expected")
stat file1.txt
}
challenge
rm file1.txt

3
sh/tests/solutions/details.sh

@ -0,0 +1,3 @@
truncate -s 1000 file1.txt
chmod 600 file1.txt
touch -amt 2201010000 file1.txt

97
subjects/devops/details/README.md

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## details
### Instructions
Create a script `details.sh` that does the following:
- Change the size of the `file1.txt` to "1000". For example:
- Change the permissions of the `file1.txt` form this:
- Update the both Modification and Access time of the `file1.txt` to "2022-01-01".
`-rw-rw-r-- 1 user user 0 dez 27 12:25 file1.txt`
to this:
`-rw------- 1 user user 0 dez 27 12:25 file1.txt`
### Usage
```console
$ stat file1.txt
File: file1.txt
Size: 0 Blocks: 0 IO Block: 4096 regular empty file
Device: ff01h/64769e Inode: 1839372 Links: 1
Access: (0664/-rw-rw-r--) Uid: ( 1000/ user) Gid: ( 1000/ user)
Access: 2022-12-27 12:44:56.397966181 +0000
Modify: 2022-12-27 12:44:56.397966181 +0000
Change: 2022-12-27 12:44:56.397966181 +0000
Birth: -
$ ./details.sh
$ stat file1.txt
File: file1.txt
Size: 1000 Blocks: 0 IO Block: 4096 regular file
Device: ff01h/64769e Inode: 1839472 Links: 1
Access: (0600/-rw-------) Uid: ( 1000/ user) Gid: ( 1000/ user)
Access: 2022-01-01 00:00:00.000000000 +0000
Modify: 2022-01-01 00:00:00.000000000 +0000
Change: 2022-12-27 14:53:43.886486188 +0000
Birth: -
$
```
### Hints
Use the `stat` command to view the current details of the file, including the last modification time and size.
```console
$ stat file.txt
File: file.txt
Size: 4030 Blocks: 8 IO Block: 4096 regular file
Device: 801h/2049d Inode: 13633379 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 1000/ linuxize) Gid: ( 1000/ linuxize)
Access: 2019-11-06 09:52:17.991979701 +0100
Modify: 2019-11-06 09:52:17.971979713 +0100
Change: 2019-11-06 09:52:17.971979713 +0100
Birth: -
```
The `touch` command's primary function is to modify a timestamp. Commonly, the utility is used for file creation, although this is not its primary function. The terminal program can change the modification and access time for any given file.
The fundamental syntax for the touch command is:
`touch <options> <file or directory name>`
Some of the touch Command Options:
- `-a` Changes the access time.
- `-d=<string>` Changes a timestamp using a date string.
- `-m` Changes the modification time.
```console
$ touch test.txt
$ ls -lu
-rw-rw-r-- 1 user user 0 dez 27 12:13 test.txt
$ touch -a test.txt
$ ls -lu
-rw-rw-r-- 1 user user 0 dez 27 12:20 test.txt
$ touch -d tomorrow test.txt
$ ls -l
-rw-rw-r-- 1 user user 0 dez 28 2022 test.txt
$ touch -m test.txt
$ ls -l
-rw-rw-r-- 1 user user 0 dez 27 12:25 testing.txt
```
Sometimes we need to remove the content of a file without deleting the file. For that Linux operating system offers a command called `truncate`. It is used to extend or reduce the file size. Truncating a file is much quicker and simpler without modifying the permissions and ownership of the file.
```console
$ touch test.txt
$ ls -l
-rw-rw-r-- 1 user user 0 dez 27 12:13 test.txt
$ truncate -s 100 test.txt
$ ls -l
-rw-rw-r-- 1 user user 100 dez 27 12:15 test.txt
```
> You have to use Man or Google to know more about commands flags, in order to solve this exercise!
> Google and Man will be your friends!
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