07 DF command

Preface

ha-ha This command Should be linux Users Basically, I will use it ?

ha-ha Here we are mainly to glance at How does this command work

main Mainly parameter processing , adopt read_file_system_list Read file system list , get_all_entries Get the information of each file system , print_table To output the information of each file system

read_file_system_list By reading the /proc/self/mountinfo perhaps getmntinfo To read the list of mounted file systems

get_all_entries Show columns as needed , Get the corresponding data item , fs, size, used, avail, mount_point etc.

print_table Output relevant information of each file system

be based on linux-4.4.0 + coreutils-8.25

Debugging is command based "df -h"

main

Processing parameters , adopt read_file_system_list Read file system list , get_all_entries Get the information of each file system , print_table To output the information of each file system

read_file_system_list

By reading the /proc/self/mountinfo perhaps getmntinfo To read the list of mounted file systems

get_all_entries

Show columns as needed , Get the corresponding data item , fs, size, used, avail, mount_point etc.

print_table 

Output table[row][col] 

End