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chpasswd:tldr:c1c90
This command combines the use of two utilities, printf
and sudo chpasswd
, to update the password of a user in a Linux system. Let's break it down:
-
printf "${username}:${new_password}"
: This uses theprintf
command to format and print the username and new password together. The${username}
and${new_password}
are variables representing the username and new password respectively. They are enclosed in double quotes ("${...}"
) for proper interpretation of any special characters or spaces in the values. -
|
: This is a pipe symbol used to redirect the output of the previous command (printf
) as input to the next command (sudo chpasswd
). -
sudo chpasswd --crypt-method ${select}
: This utilizes thesudo
command to executechpasswd
with elevated privileges.chpasswd
is a utility for updating users' password entries in the system's password file. The--crypt-method
option specifies the method to use for encrypting the password.${select}
is a variable representing the selected encryption method, and it is expected to be provided prior to executing the command.
So, when you run this command, it takes the ${username}
and ${new_password}
variables, combines them with a :
separator, and passes it to chpasswd
to change the password for the specified user using the provided encryption method. The sudo
command ensures that the command is executed with the necessary administrative privileges.