for i in {1..10}
while [i le 50]
vim /etc/crontab在里面增加下面内容：
50 16 * * * rootrm-rf/abc/* 2>&1 &
00 8-18 * * * root cat /xyz/x1|awk'{print $1}' >> /backup/bak01.txt 2>&1 &
50 17 * * 1 root cd /data;tar -zcvf backup.tar.gz * 2>&1 &
55 17 * * * root umount /hdc 2>&1 &
min hour dayofmonth weekofmonth dayofweek
用=而不是==
grep-vxFf a b |