ps1 cords

1. Introduction to PS1 variablesPS1 is an environment variable for Linux end users that describes the settings for the command line prompt.You can use the Man Bash command to view the Bash Handbook, find the special characters that the variable supports, and the meaning of these special characters:\d: #代表日期, formatted as weekday month date, for example: "Mon-1"\h: #完整的主机名称.\h: #仅取主机的第一个名字, as in the example above, Fc4,.linux is omitted\ t: #显示时间为24小时格

${#var} 6.2. Identify the current shell version$ echo $SHELL /bin/ bash $ echo $0 Bash6.3. Check whether it is a super userUID is an important environment variable that can be used to check whether the current script is running as a superuser or as a normal user: if [$UID-ne 0 ]; Then Echo Non root user. Please run as root. Else echo "Root user" fi #root用户的UID是06.4. Modify BASH Hint stringYou can use the PS1 environment variable to customize t

1. Set the environment variable histsize so that it can save 10,000 command history. vim/etc/profile change histsize=1000 to histsize=10000 2. Why do I set PS1 (ps1= "[\[emailprotected]\h \w]\$") display the results to be different from what we expected, and how do I set it to restore the original default? should be ps1= ' [\[emailprotected]\h \w]$ ' (

Failed to enter the desktop after a successful boot entry (wireless loop prompts for a password). May be due to changes in/etc/profile, at this time you can restart the computer in the system selection when the advanced option to enter the interface-free terminal mode.Using commands Vim/etc/profile Open profile file to restore the file to its original state (probably due to the addition of export import new environment variable)Just copy the configuration file to overwrite the original configur

. 　　 Prompt 　　 Bash has two levels of prompt. The first-level prompt is often seen when Bash is waiting for command input. The default value of the first-level prompt is the $ symbol. If you do not like this symbol or want to define a prompt, you only need to modify the value of the PS1 variable. For example, change it: 　　 PS1 = "Enter a command :" 　　 The second-level prompt is displayed when you need to en

variable • read-p through breakpoint "please input a value (number):" a read-t 5 "Please enter a value: "IP -- set the timeout value for the value assignment. # H = 192.168.0.253 # echo $ H192.168.0.253 # read-p "Please enter ip address:" H2Please enter ip address: 192.168.0.252 # echo $ H2192.168.0.252 • reference variable • echo $ VARNAME • echo $ {VARNAME} scope • Global variable (parent and child shell) • export •. or source call • local variable • variable in Program • variable in function

except the root user) 2. you can change the command prompt through the variable $ PS1. you can enter echo $ PS1 in the command to view the current settings, as shown below: [root @ centos6 ~] # Echo $ PS1 [\ u @ \ h \ W] \ $ reset the command prompt format: [root @ centos6 ~] # PS1 = "[\ u @ \ h \ W] \ $" [\ u @ \ h \

1. Concepts Singleton mode: it is designed to ensure that a class has only one instance and provides a global access point for it. This instance is shared by all program modules. [Cpp]Class CSingleton{// Public static method to obtain the instancePublic:Static CSingleton * GetInstance (){If (m_pInstance = NULL) // determines whether the first call is successful.M_pInstance = new CSingleton ();Return m_pInstance;}// Private constructor to prevent instantiationPrivate:CSingleton (){};// Private St

Bash has two levels of prompt. The first-level prompt is often seen when Bash is waiting for command input. The default value of the first-level prompt is the $ symbol. If you do not like this symbol or want to define a prompt, you only need to modify the value of the PS1 variable. For example, change it: PS1 = "Enter a command :" The second-level prompt is displayed when you need to enter more information

PATH = $ PATH:/usr/loacl/bin; export PATH (6) shell environment variables CDPATH is used to find the path of the cd command. HOME/etc/passwd file IFS Internal Field Separator. the default value is space, tab, and line feed. Use MAIL/var/mail/$ USERNAME mail and other programs PATH PS1, PS2 default prompt ($) and line feed prompt (>) TERM terminal type. Common types include vt100, ansi, vt200, and xterm. Example: $

How to change the Linux font and background color-Linux general technology-Linux technology and application information. Linux users must be familiar with the black and white text on the text interface and the white and black text on X. These two colors can be said to be classic and clear. However, you can change the font and background color based on your preferences. The following describes how to change the font and background color of RedHat: Command: