Shulou(Shulou.com)06/01 Report--

These commonly used basic commands must remember "Mr.Robot".

View the file:

# ls-lhtr

To make the configuration effective:

# source / etc/profile

#. / etc/profile

Create a directory:

# mkdir-p

Copy:

# cp-r

Soft links:

# ln-sv

Hard link: the inode that points to this file cannot break the system, partition, or link directory.

Tar decompression package gz

# tar xf

Create a user:

# groupadd-r mysql

# useradd-g mysql-r-s / sbin/nologin mysql

Useradd

-g: specify a user group.

-r: set up a system account.

-s: specifies the shell to be used by the user after logging in.

Groupadd

-r: join the group ID, which is lower than the 499 system account.

# userdel-r Delete the home directory

$?: execution status of the previous command

The status is represented by a number: 0-255

0: successful

1-255: failed, 1.2.127.255 reserved

File FILE..: views the format of the contents of the file

Tac: displaying files in reverse order

-exec COMMAND {}\;: execute the specified command on the found file

Find / var/log *-exec ls-l {}\

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