此文档用于记录自己遇到的问题和解决办法!
1、CentOS执行ftp命令提示ftp:command not found解决方法
centos7.3.1611 安装ftp 客户端工具
[root@xxxx ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
cat /etc/redhat-release
http://mirror.centos.org/centos/7/os/x86_64/Packages/ftp-0.17-67.el7.x86_64.rpm
rpm -Uvh http://mirror.centos.org/centos/7/os/x86_64/Packages/ftp-0.17-67.el7.x86_64.rpm
2、df -h du -h ls -h 命令
xxxx@ubuntu:/tmp$ ls -l
total 12200788
-rw-r--r-- 1 xxxx xxxx 12493601071 Mar 14 18:18 Windows.zip
xxxx@ubuntu:/tmp$ ls -lh
total 12G
-rw-r--r-- 1 xxxx xxxx 12G Mar 14 18:18 Windows.zip
Linux du命令用于显示目录或文件的大小。du会显示指定的目录或文件所占用的磁盘空间。
xxxx@ubuntu:/tmp$ du -h
4.0K ./.X11-unix
4.0K ./.ICE-unix
12G .
查看系统磁盘设备,默认是KB为单位:
xxxx@ubuntu:/tmp$ df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/ubuntu--vg-root 87845160 24205024 59154812 30% /
none 4 0 4 0% /sys/fs/cgroup
udev 4019860 4 4019856 1% /dev
tmpfs 806220 592 805628 1% /run
none 5120 0 5120 0% /run/lock
none 4031088 0 4031088 0% /run/shm
none 102400 0 102400 0% /run/user
/dev/sda1 240972 37043 191488 17% /boot
使用-h选项以KB以上的单位来显示,可读性高:
xxxx@ubuntu:/tmp$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/ubuntu--vg-root 84G 24G 57G 30% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 3.9G 4.0K 3.9G 1% /dev
tmpfs 788M 592K 787M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 3.9G 0 3.9G 0% /run/shm
none 100M 0 100M 0% /run/user
/dev/sda1 236M 37M 187M 17% /boot
查看全部文件系统:
xxxx@ubuntu:/tmp$ df -a
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/ubuntu--vg-root 87845160 24205024 59154812 30% /
proc 0 0 0 - /proc
sysfs 0 0 0 - /sys
none 4 0 4 0% /sys/fs/cgroup
none 0 0 0 - /sys/fs/fuse/connections
none 0 0 0 - /sys/kernel/debug
none 0 0 0 - /sys/kernel/security
udev 4019860 4 4019856 1% /dev
devpts 0 0 0 - /dev/pts
tmpfs 806220 592 805628 1% /run
none 5120 0 5120 0% /run/lock
none 4031088 0 4031088 0% /run/shm
none 102400 0 102400 0% /run/user
none 0 0 0 - /sys/fs/pstore
cgroup 0 0 0 - /sys/fs/cgroup/cpuset
cgroup 0 0 0 - /sys/fs/cgroup/cpu
cgroup 0 0 0 - /sys/fs/cgroup/cpuacct
cgroup 0 0 0 - /sys/fs/cgroup/memory
cgroup 0 0 0 - /sys/fs/cgroup/devices
cgroup 0 0 0 - /sys/fs/cgroup/freezer
cgroup 0 0 0 - /sys/fs/cgroup/blkio
cgroup 0 0 0 - /sys/fs/cgroup/perf_event
cgroup 0 0 0 - /sys/fs/cgroup/hugetlb
/dev/sda1 240972 37043 191488 17% /boot
binfmt_misc 0 0 0 - /proc/sys/fs/binfmt_misc
systemd
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