Shell

The following lists the common methods of $ $n         represents the arguments passed to the script, representing the first one, and the second one ... $#        represents the number of arguments passed to the script $0         

ShellApplication TipsTips:1, command completion function: Key2, clear screen:ctrl+l3. Delete all contents before cursor:ctrl+u4. Command history: HistoricalThen:! History The command label listed, you can execute that command. Such as:! 188Also:

Method One:Modify the/etc/sysconfig/i18n fileChange the lang= "en_US" inside to GB2312.To restart the machine.Without restarting the method, directly# lang= "GB2312"And then we can.Modify i18n just to restart the activeMethod Two:#vi

1, mkdir newdir: New directory2. Touch filename: New file3. Vi/vim filename: Edit file4. grep [-ACIVN] [-A] [-b] [--color=auto] ' Search string | | Regular expression ' filename : A matching row was found from the file and displayed-A binary file

Tag: Shell Hup (1) suspended, usually caused by terminal disconnection or user exit INT (2) interrupt, usually caused by Ctrl + C Combination Quit (3) exits, usually caused by Ctrl +/Combination Abrt (6) abort, usually caused by some serious

Today, I wrote a shell monitoring script to monitor the running status of keepalived by combining the shell script with zabbix. The script name is check_keepalived.sh #! /Bin/bashunm = 'ps-Ef | grep keepalived | WC-l' if [$ UNM-GT 2]; then Echo 1;

When writing shell scripts, brackets and brackets are often used. I. Parentheses, Parentheses () 1. Single parentheses. ① Command Group. The commands in parentheses will open a new sub-shell for sequential execution, so the variables in parentheses

Simple shell script exercises Simple Example Conversation Script: The variable content is determined by the user.   [[Email protected] Scripts] # vi sh02.sh #! /Bin/bash # program: # user inputs his first name and last name. program

1. How to perform arithmetic computation in Shell A = 1; B = 2 (1) Let C = $ A + $ B (2) c = $ [$ A + $ B] (3) c =$ ($ A + $ B )) (4) C = 'expr $ A + $ B '(note the spaces before and after the operators) 2. Test Method [Expression]

Entry Level Entry level: strings like 1, 2, 3, 4, and 5 #! /Bin/bashvar = "1, 2, 3, 4, 5" Var =$ {var //,/} For I in $ var; do echo $ I; done In this way, the results can be output.Shap level In the preceding example, the split string cannot

I recently wrote a shell script, which has high efficiency requirements, so I read some articles. I feel that this article is really good. The example in this article is really great! Institute Use me to extract them: @ 1: instance: Requirement:

Hbase is a distributed, column-oriented open source database. Its implementation is based on Google's bigtable theory and hadoop HDFS file system. Hbase is different from general relational databases (RDBMS ). Hbase is a column-based database

1. Define Variables 1) when defining a variable, the variable name does not contain the dollar sign ($), for example:Var = "Hello World"2) Note that there is no space between the variable name and equal sign, which may be different from all

Summary of statements in Shell integration: If statement: But the if statement of the Branch: If []; then CMD; Fi If statement for dual Branch: If []; then Cmd1; Else Cmd2; Fi Multi-branch if statement: If []; then Cmd1; Elif []; then Cmd2; Elif [];

1. Echo Parameters -N does not wrap (default line feed) -E makes the transfer character valid Example Ss = 'abc \ n' echo-e $ ssabc # echo $ ssabc 2. When assigning values = do not include spaces on both sides A = "hello" # error A = "hello" 3.

[[Email protected] shell] # Cat getopts. Sh #! /Bin/bash # Date = 2014-09-16 # Is to practice the getopts While getopts "A: BC" Arg (: The preceding variable must follow the parameter) Do Case $ ARG in A) Echo "A's Arg: $ optarg" ;; B) Echo "B" ;; C)

Shell upgrade,/bin/bash versions 4.1 to 4.3, bash4.3 Bash environment variables have arbitrary code execution vulnerability: "Using CGI requests can cause remote code execution, which in turn leads to server intrusion, causing serious harm,Patches

Getting started with Shell programming (second edition) (medium)Variable test statement-test Purpose: test whether the variables are equal, empty, and file type. Format: Test condition or [] # range: integer, String, file 1) integer test: Test

Shell: displays the basic system information script and shell basic information script. #! /Bin/bashecho "IP:" ifconfig | grep "inet addr" | grep-v 127.0.0.1 | awk '{print $2}' | awk-F ': ''{print $2} 'echo" Product Name: "dmidecode | grep Nameecho"

Basic Regular Expressions and shell Regular Expressions for Linux shell Programming Fast query of Linux commands and Shell programming examples Covers common Linux commands, including Shell script programming syntax, text processing