7 Yue 22 Linux job - File Management

Exercises content

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answer

1 answer

[root@centos7 ~]# echo '*/1 * * * * /usr/bin/cp /etc /data/`/usr/bin/date +\%Y-\%m-\%d` -av' > /var/spool/cron/root
[root@centos7 ~]# crontab -l
*/1 * * * * /usr/bin/cp /etc /data/`/usr/bin/date +\%Y-\%m-\%d` -av

effect

[root@centos7 ~]# ls /data
1.txt~  2019-07-23  2.txt~  7.txtx  a  fi.log  rootdir  sysconfig-bak
[root@centos7 ~]# ll /data/2019-07-23 -d
drwxr-xr-x. 143 root root 8192 7月  23 08:49 /data/2019-07-23

Problems encountered:

1, the direct use

cp /etc/ /data/`date +%Y-%m-%d` -av

No problem
2, but the write crontab error, put the cp, date written as absolute path or command error,
Richard:
https://yq.aliyun.com/articles/539103
% Percent use the backslash ,finally:

[root@centos7 ~]# crontab -l
*/1 * * * * /usr/bin/cp /etc /data/`/usr/bin/date +\%Y-\%m-\%d` -av

2, the answer

[root@centos7 ~]# cp /root /data/rootdir -a