In Linux, shell displays the user name and host name, And linuxshell

In Linux, shell displays the user name and host name, And linuxshell
1. Problem Description

Recently, I re-installed something on the server. As a result, the shell interface I logged on to became displayed-bash-4.2 $, which looks ugly and inconvenient to use, because the user name and host name are required for scp, the user name and host name are modified.

2. Solution

Modify the. bash_profile file of the current user, and add:

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

Source. bash_profile, OK, problem solving.

3. Explanation

PS1 is an environment variable for Linux end users. It is used to describe the settings of command line prompts. \ U is a special character, which can be viewed through the man bash command. Its meaning is 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 described as follows:

\ U current user name \ h. separate the first host name \ H complete host name \ W Directory Name of the current working directory, only display the directory name of the last directory \ w current working directory of the path, display the full path