linux - Shell Script to backup /etc/passwd every 6pm -


how can create cronjob create backup /etc/passwd every 6pm.

this should output:

passwd_<date>.tar.gz

i new in shell scripting, trying figure out. read cron , crontab, but, can't figure how create backup using shell script.. can me.. examples appreciated. in advance.

use crontab option -e directly edit cronjob:

crontab -e

the specification of cronjob is:

minute hour day month day-of-week command-line-to-execute

the following sets job run everyday @ 6:00 pm

0 18 * * * tar -czf passwd_`date | tr ' ' '_' | tr ':' '_'`.tar.gz /etc/passwd

the command can script, in case simple tar command. name of file formed calling date command, converting spaces , colons underscores. creates filenames following:

passwd_sun_may__3_13_13_00_cdt_2015.tar.gz

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