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chpasswd:tldr:d7753
This command is used to change the password of a user account on a Unix or Linux system.
Let's break down the command step by step:
-
printf "${username}:${new_password}"
:printf
is a command used to format and print data. Here, it is used to print a string which consists of theusername
variable followed by a colon (:
) and thenew_password
variable. The${variable_name}
syntax is used to represent the value of a variable. -
|
: This is a pipe operator that takes the output of the command on the left side and passes it as input to the command on the right side. In this case, the output of theprintf
command is passed as input to thesudo chpasswd
command. -
sudo chpasswd
:sudo
is a command that allows a user with appropriate permissions to execute a command as another user (usually the root user).chpasswd
is a command used to update password entries in the system password file. By usingsudo
beforechpasswd
, the command is executed with root privileges.
In summary, this command takes the username
and new_password
variables, combines them with a colon separator, and passes them to chpasswd
with root privileges using sudo
. This effectively changes the password of the specified user account.