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98 lines
3.1 KiB
98 lines
3.1 KiB
2 years ago
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## details
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### Instructions
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Create a script `details.sh` that does the following:
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- Change the size of the `file1.txt` to "1000". For example:
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- Change the permissions of the `file1.txt` form this:
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- Update the both Modification and Access time of the `file1.txt` to "2022-01-01".
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`-rw-rw-r-- 1 user user 0 dez 27 12:25 file1.txt`
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to this:
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`-rw------- 1 user user 0 dez 27 12:25 file1.txt`
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### Usage
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```console
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$ stat file1.txt
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File: file1.txt
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Size: 0 Blocks: 0 IO Block: 4096 regular empty file
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Device: ff01h/64769e Inode: 1839372 Links: 1
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Access: (0664/-rw-rw-r--) Uid: ( 1000/ user) Gid: ( 1000/ user)
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Access: 2022-12-27 12:44:56.397966181 +0000
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Modify: 2022-12-27 12:44:56.397966181 +0000
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Change: 2022-12-27 12:44:56.397966181 +0000
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Birth: -
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$ ./details.sh
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$ stat file1.txt
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File: file1.txt
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Size: 1000 Blocks: 0 IO Block: 4096 regular file
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Device: ff01h/64769e Inode: 1839472 Links: 1
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Access: (0600/-rw-------) Uid: ( 1000/ user) Gid: ( 1000/ user)
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Access: 2022-01-01 00:00:00.000000000 +0000
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Modify: 2022-01-01 00:00:00.000000000 +0000
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Change: 2022-12-27 14:53:43.886486188 +0000
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Birth: -
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$
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```
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### Hints
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Use the `stat` command to view the current details of the file, including the last modification time and size.
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```console
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$ stat file.txt
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File: file.txt
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Size: 4030 Blocks: 8 IO Block: 4096 regular file
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Device: 801h/2049d Inode: 13633379 Links: 1
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Access: (0644/-rw-r--r--) Uid: ( 1000/ linuxize) Gid: ( 1000/ linuxize)
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Access: 2019-11-06 09:52:17.991979701 +0100
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Modify: 2019-11-06 09:52:17.971979713 +0100
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Change: 2019-11-06 09:52:17.971979713 +0100
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Birth: -
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```
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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.
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The fundamental syntax for the touch command is:
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`touch <options> <file or directory name>`
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Some of the touch Command Options:
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- `-a` Changes the access time.
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- `-d=<string>` Changes a timestamp using a date string.
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- `-m` Changes the modification time.
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```console
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$ touch test.txt
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$ ls -lu
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-rw-rw-r-- 1 user user 0 dez 27 12:13 test.txt
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$ touch -a test.txt
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$ ls -lu
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-rw-rw-r-- 1 user user 0 dez 27 12:20 test.txt
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$ touch -d tomorrow test.txt
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$ ls -l
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-rw-rw-r-- 1 user user 0 dez 28 2022 test.txt
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$ touch -m test.txt
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$ ls -l
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-rw-rw-r-- 1 user user 0 dez 27 12:25 testing.txt
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```
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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.
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```console
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$ touch test.txt
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$ ls -l
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-rw-rw-r-- 1 user user 0 dez 27 12:13 test.txt
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$ truncate -s 100 test.txt
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$ ls -l
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-rw-rw-r-- 1 user user 100 dez 27 12:15 test.txt
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```
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> You have to use Man or Google to know more about commands flags, in order to solve this exercise!
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> Google and Man will be your friends!
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