Замораживание / пауза экрана Arch

Ваш личный файл crontab должен выглядеть следующим образом

45 18 * * * /bkp_db.sh

Существует несколько файлов crontab, каждый из которых имеет немного другую компоновку. личные файлы crontab, редактируемые с помощью crontab -e, не содержат имени пользователя.

man crontab говорит,

There    is    one    file    for    each   user's   crontab   under   the
/var/spool/cron/crontabs directory. Users are  not  allowed  to  edit  the
files  under  that directory directly to ensure that only users allowed by
the system to run periodic tasks can add them, and only syntactically cor‐
rect  crontabs  will  be  written  there.   This is enforced by having the
directory writable only by the crontab group and configuring crontab  com‐
mand with the setgid bid set for that specific group.

Но если вы прочитаете man cron, вы также прочитаете,

Additionally,  in  Debian,  cron reads the files in the /etc/cron.d direc‐
tory.  cron treats the files in /etc/cron.d as in  the  same  way  as  the
/etc/crontab  file (they follow the special format of that file, i.e. they
include the user field). However, they are  independent  of  /etc/crontab:
they  do  not, for example, inherit environment variable settings from it.
This change is specific to Debian  see  the  note  under  DEBIAN  SPECIFIC
below.