Author: Tyan
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1. Problem description

Recently, a little thing was reinstalled on the server. As a result, the login shell interface turned into - bash-4.2 $, which was ugly and inconvenient to use. The main reason is that scp needs user name and host name, so it was modified.

2. Solutions

Modify the. Bash? Profile file of the current user, and add:

export PS1='[\u@\h \W]$ '

Source. Bash? Profile, OK, problem solving.

3. Interpretation

PS1 is an environment variable for Linux end users, which is used to describe the setting of command line prompt. \u and so on are special characters, which can be viewed through the man bash command. Their meanings are as follows:

\a     an ASCII bell character (07)
\d     the date in "Weekday Month Date" format (e.g., "Tue May 26")
\D{format}
       the format is passed to strftime(3) and the result is inserted into the prompt string; an empty format results in a locale-specific time representation.  The braces are required
\e     an ASCII escape character (033)
\h     the hostname up to the first `.'
\H     the hostname
\j     the number of jobs currently managed by the shell
\l     the basename of the shell's terminal device name
\n     newline
\r     carriage return
\s     the name of the shell, the basename of $0 (the portion following the final slash)
\t     the current time in 24-hour HH:MM:SS format
\T     the current time in 12-hour HH:MM:SS format
\@     the current time in 12-hour am/pm format
\A     the current time in 24-hour HH:MM format
\u     the username of the current user
\v     the version of bash (e.g., 2.00)
\V     the release of bash, version + patch level (e.g., 2.00.0)
\w     the current working directory, with $HOME abbreviated with a tilde (uses the value of the PROMPT_DIRTRIM variable)
\W     the basename of the current working directory, with $HOME abbreviated with a tilde
\!     the history number of this command
\#     the command number of this command
\$     if the effective UID is 0, a #, otherwise a $
\nnn   the character corresponding to the octal number nnn
\\     a backslash
\[     begin a sequence of non-printing characters, which could be used to embed a terminal control sequence into the prompt
\]     end a sequence of non-printing characters

Some special characters are explained as follows:

\u user name of the current user
 \h use the first hostname separated by
 \H full host name
 \W the directory name of the current working directory. Only the last directory of the path is displayed
 \w directory name of the current working directory, showing the full path