Shell script execution and configuration files

Linux shell script execution and configuration files

• Bash Script Execution method:
  

  1 interpreter runs/usr/bin/bash bash foo.sh 2 run script with path (requires x permission) chmod +x foo.sh/path/to/foo.sh 3 use. or so The Urce command executes the script.        /path/to/foo.sh source/path/to/foo.sh The difference between the execution method and the 3 execution method: 1, 2: The interpreter being executed is a subroutine and therefore does not affect the variables of the current shell. 3: The interpreter being executed is the current shell program, which reads the variables and overwrites the variables for the current environment. (typically used to set default variables)

• Bash's configuration file
  

       Global Configuration         /etc/profile         /etc/profile.d/*.sh        /etc/bashrc      Personal Configuration         ~/.bashrc         ~/.bash_profile        ~/.bash_logout         profile Series File:              (1)   for defining environment Variables              (2)   Run a command or script         BASHRC series file:              (1)   define command aliases and functions               (2)   Define local variables         .bash_logout:              scripts executed before the user exits the login 

• Bash Interactive login and non-interactive login
  

  Interactive logon and non-interactive logon differences: Read profile different switch command: SU USERNAME non-interactive su-username interactive logon interactive logon read profile order:/et        C/profile---/etc/profile.d/*.sh---~/.bash_profile----~/.BASHRC to read the configuration file in sequence: /ETC/BASHRC-~/.BASHRC-/etc/profile.d/*.sh Note: When the interactive shell switches to a non-interactive shell, it first inherits all the variables of the parent shell, then reads the variables in the corresponding configuration file and Overwrite an existing variable.

  
  

• Variable check and change
  

      set        set   lists the variable names and their values in the current shell     env        env   list the current shell environment variables      unset        unset name       Remove variable names     $-   show enabled features for set         #  echo $-        himBH             h :  whether to open hash         Whether     i :  is an interactive shell             m :  whether to open job control             b  :  whether to open the extended functionality of {}             C :  Whether override redirection is turned on   &Nbsp;         h :  whether to enable the history expansion command and use! Wait for the shortcut call 

  
  

This article is from the "12064120" blog, please be sure to keep this source http://12074120.blog.51cto.com/12064120/1963915

Shell script execution and configuration files