linux shell脚本数据处理

/bin/date +%F >> /test/shelldir/ex2.info
echo "disk info:" >> /test/shelldir/ex2.info
/bin/df -h >> /test/shelldir/ex2.info
echo >> /test/shelldir/ex2.info
echo "online users:" >> /test/shelldir/ex2.info
/usr/bin/who | /bin/grep -v root >> /test/shelldir/ex2.info
echo "memory info:" >> /test/shelldir/ex2.info
/usr/bin/free -m >> /test/shelldir/ex2.info
echo >> /test/shelldir/ex2.info
#write root
/usr/bin/write root < /test/shelldir/ex2.info && /bin/rm /test/shelldir/ex2.info
#crontab -e
#0 9 * * 1-5 /bin /sh /test/ex2.sh

date +%F：将转换后的日期追加ex2.info中，如果该目录不存在则创建该目录

df -h ：磁盘信息

/usr/bin/  ：linux命令主要存放在/bin和/usr/bin/下。

/usr/bin/who | /bin/grep -v root：排除root用户后的所有登录这台机器的用户

/usr/bin/free -m ：磁盘空间信息

/usr/bin/write root < /test/shelldir/ex2.info && /bin/rm /test/shelldir/ex2.info ：将写入的文件写给root用户并且(&&)删除(/bin/rm)该文件。