Shell

This article mainly introduced the shell in the function return value exceeds the problem, the shell returns by return is limited, the maximum return 255, more than 255, then starts from 0 computation, needs the friend may refer to under 1. Preface

The shell of a Linux system is not just a command, but an interpreter of other commands. You can debug other commands to complete the compilation. So how should shell commands be used in Linux systems? In fact, as a command language,

What are the shell specific commands in the Win7 system? Shell:profile The root directory of the currently logged-on user Shell:usersfilesfolder Same as Shell:profile Shell:personal The My Documents folder for the currently logged-on user

Previous Article JMeter Bean Shell Use (i) A brief introduction of the bean shell in the next jmeter, this article is a supplement to the above, the main summary of the several commonly used scenarios and methods, I believe these basic can cover

Precautions1) Opening add interpreter: #!/bin/bash2) syntax indentation, use four spaces, and more explanatory notes.3) Naming recommendation rules: variable name capital, local variable lowercase, function name lowercase, the name reflects the

IfconfigThis command is consistent with the "ipconfig" function of windows for displaying details such as network interfaces, subnet masks, and so on.Ifconfig the left column is the network interface name, which occupies 10 bytes, and several

1. Introduction\2. The Business Server remotely updates the script to browse the server files#!/bin/bashoperate=$1IP=$2Conf_file="/var/www/html/test/ip_list"File_chsum="/var/www/html/test/cksvalue"File_ser="10.60.10.62"cksum () {SSH

In the process of writing shell scripts, we often need to process text files using the SED flow editor and awk. First, what is SED?Sed is an online editor that processes a single line of content at a time. SED is a non-interactive editor. It does

Some good habits of shell scripting 1. Naming rules The script name ends with. SH, and names are as famous as possible. Here are a few of the script naming styles that are available for reference. Through the following fresh and

the parentheses are the orders. curly braces are variable valuesOne, parenthesis, parentheses ()1 , single parenthesis ()① Command Group. The commands in parentheses will be executed in a new sub-shell sequence, so the variables in parentheses

Today read the Old Boys Education blog http://oldboy.blog.51cto.com/ in a shell implementation of Nginx reverse proxy back end Realserver Health check of the article, According to one of the students Friends of the idea of writing a

#!/bin/sh#check memcache process and restart if downmm_bin= "/usr/local/bin/memcached" mm_log= "/home/xxx/memcached_ Check.log "mm_ports= (" 11211 "" 11212 ") mm_param= ("-d-m 20480-p 11211-u www ""-d-m 256-p 11212-u www ") mm_count=${#mm_por

Numerical Calculation of variables1.$ ((expression))(1). Experiment 1[Email protected] ~_~ day4]# cat test.sh#!/bin/bashA=6b=2echo "a-b=$ (($a-$b))"echo "a+b=$ (($a + $b))"echo "a*b=$ (($a * $b))"echo "a/b=$ (($a/$b))"echo "a%b=$ (($a% $b))"echo "a**

Text ProcessingCatCommand1) stitching files: Vertical stitching, not horizontal stitching[Email protected]:~# cat list List2Line2Line3Line4Line5Line5Line6Line7Total 32Klrwxrwxrwx 1 root root 4 Jan backup-/data/backup-rw-r--r--1 root root 1 13:18

The shell is an interface that users interact with the kernel, and the most popular shell is now called the Bash shell. The shell is also a programming language , Shell Scripting with Linux shell commands. A system can have multiple shells, and you

----Shell 3/home/oracle/utility/macro/call_autopurge_arch.shDescription:call Purge Archive log file job# Syntax:autopurge_arch.sh [Oracle_sid] [archived base dir] [#hours kept]#Script_dir=/home/oracle/utility/macro#${script_dir}/autopurge_archlog.sh

1, write a script to complete the following functions(1) Pass a disk device file path to the script to determine whether the device exists;(2) If present, displays all the partition information on this device;#!/bin/bash## finddev.sh# pass a disk

-e file If file exists, true-d file if file is a directory, true-f file If file is regular, true-l file if file is a symbolic link, true-r file if file is readable, true-W file True-X If file is writable, or true-s file if files are executable or

https://docs.mongodb.com/getting-started/shell/query/OverviewYou can use the find () method to issue a query to retrieve data from a collection in MongoDB.All queries in MongoDB has the scope of a single collection.Queries can return all documents

Definition: array= (1 2 3)Echo ${array[0]}Echo ${array[1]}Echo ${array[2]}echo ${array[*]} all elementsEcho ${array[@]} The length of the arrayArray AssignmentArray= (1 2 3) There are 3 elements in this arrayArray[3]=4 4 elements in this