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#!/usr/bin/env bash |
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# Unofficial Bash Strict Mode |
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set -euo pipefail |
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IFS=' |
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' |
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script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd) |
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challenge() { |
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submitted=$(cd "$1" && bash "$script_dirS"/student/file-details.sh) |
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expected=$(cd "$1" && bash "$script_dirS"/solutions/file-details.sh) |
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diff <(echo "$submitted") <(echo "$expected") |
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} |
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challenge hard-perm |
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TZ=utc ls -l --time-style='+%F %R' | sed 1d | awk '{print $1, $6, $7, $8, $9, $10}' |
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## files-details |
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### Instructions |
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Create a script `files-details.sh`, which will allow you to see the files inside the folder `hard-perms`, this way: |
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Expected output: |
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```console |
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$ ./files-details.sh |
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dr-------x 2 user user 4096 dez 13 17:50 0 |
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-r------w- 1 user user 0 dez 13 17:51 1 |
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-rw----r-- 1 user user 0 dez 13 17:51 2 |
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drwxrwxrwx 2 user user 4096 dez 13 17:51 3 |
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-r-x--x--- 1 user user 0 dez 13 17:51 4 |
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-r--rw---- 1 user user 0 dez 13 17:51 5 |
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-r--rw---- 1 user user 0 dez 13 17:51 6 |
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-r-x--x--- 1 user user 0 dez 13 17:51 7 |
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-rw----r-- 1 user user 0 dez 13 17:51 8 |
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-r------w- 1 user user 0 dez 13 17:51 9 |
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dr-------x 2 user user 4096 dez 13 17:50 A |
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``` |
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### Hints |
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- `ls -l --time-style=TIME_STYLE` |
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- Time conversion specifiers you need to know: |
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- `%R`, 24-hour hour and minute. Same as ‘%H:%M’. |
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- Date conversion specifiers you need to know: |
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- `%F`, full date in ISO 8601 format; like ‘%+4Y-%m-%d’ except that any flags or field width override the ‘+’ and (after subtracting 6) the ‘4’. This is a good choice for a date format, as it is standard and is easy to sort in the usual case where years are in the range 0000…9999. |
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- You can use `sed` to remove the first line of the output. |
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```console |
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$ ./files-details.sh # without using sed |
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total |
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-rw-rw-r-- 2022-12-20 03:10:18 README.md |
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$ ./files-details.sh # using sed |
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-rw-rw-r-- 2022-12-20 03:10:18 README.md |
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$ |
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``` |
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- `awk`. |
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You can specify specific column names to display or include in the awk output using the field numbers. For example: |
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```console |
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$ ls -l | awk '{print $1, $2, $3, $4, $5, $6, $7, $8, $9, $10}' # print all the given fields |
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total 4 |
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-rw-rw-r-- 1 user user 1989 dez 20 15:19 README.md |
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$ ls -l | awk '{print $1, $2, $4, $5, $7, $8, $10}' # print all the given fields |
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total 4 |
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-rw-rw-r-- 1 user 2350 20 15:25 |
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$ |
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``` |
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awk ‘{print $1}’ emp_records.txt |
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awk {print $1, $6, $7, $8, $9, $10}' |
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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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### References |
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- [Time conversion specifiers](https://www.gnu.org/software/coreutils/manual/html_node/Time-conversion-specifiers.html). |
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- [Date conversion specifiers](https://www.gnu.org/software/coreutils/manual/html_node/Date-conversion-specifiers.html). |
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- [awk](https://www.gnu.org/software/gawk/manual/html_node/Print-Examples.html). |
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