Shell

Select Connection Query Brief:Union Union Query Second, about the internal connection Union Union Query Function: Merge 2 or more query results together Details: (table 1 Query results) Union (table 2 query results) Execution: The results of

SummaryThis chapter describes how to use ls and stat to expose files and file meta data , and how to use Touch set the time stamp not seen . Touch can display information about datetime and scope limitations on many existing systems .Shows how to

1.sh-x ScriptThis executes the script and displays the values of all variablesFor example, script:#!/bin/bash#a test about shiftif$#0 ]thenecho"there is no parameters"exit0fisum=0while$#-gt0 ]do $sum$1` shiftdoneecho$sumOutput:2.sh-n ScriptDo not

Some of the more functional requirements are relatively simple to consider using the shell script to write, so as to facilitate fast and stable1. Read the file value, open and close some programs according to the file value 1 or.A. While:DoDoneis an

Recently in the study of shell programming, the text if there are errors in the place also hope that you criticize.Let's start with a simple summation function.#!/bin/bash#a test about function78f_sum(){ return $(($1+$23536);echo$total,$?;Note

1.crash Log run-to-collapse positioningDwarfdump--arch=--lookup 0x44b79 .app.dsymAtos-arch o .app/ 0x000235f32.xcode installation path Query and settingsXcode-select-print-path #查询Xcode-select--switch #设置3. View the instruction set of the

$#, the number of arguments followed by the script runtime#! /bin/bashCase ' $# ' in 0) printf "Enter A number: " Read n= $REPLY ;; *) n=$1 ;;EsacX=$ (((1 + $n) * $n/2))echo "Tne value of 1 + 2 + 3....+ $n = $x"The

sudo uname--m View the number of operating system bitssudo uname--s display kernel name ssudo uname--r display kernel versionsudo uname--n display the network host namesudo uname--p display CPUUnder Ubuntu, text files are usually opened with the

By using the Read command, you can output or perform operations after entering content from the terminal1 #!/bin/bash2#Author: Blacksonny3#Copyright (c)4 #Script follows here: 5 6 Echo " How is old is you ? " 7 Read Age 8 Echo " " $ageThe above

The shell is a program written in C language.Several common Shell:bash, SH, csh, ksh, etc.Bash is the default standard shell for Linux and is fully compatible with SHSH is the default standard shell for UNIXAsh is the smallest resource-intensive

Automatically back up database scripts #!/bin/bash#auto Bakcup MySQL#by 2015-7-2Bak_dir= "/data/backup/' Date +%y%m%d '"Mysql_db=discuzMysql_user=rootmysql_pw=123456Mysql_cmd=/usr/bin/mysqldumpIf [$UID-ne 0]; Thenecho "must to is use the root

#!/bin/bash#斐波那契数列#不要用递归, the depth is more than 30 old fire. functionfun_test(){if[ $ -lt 3]; Then Echo 1 return fisum1=1Sum2=1 LetCount= $-2sum=0 while[$count -GT 0]; Do Letcount-- LetSum=sum1+sum2 LetSum1=sum2 LetSum2=sum

Start your own shell script practice today, just as the company has too servers, to time the data of the CP is monthly:Consider: First look for the law, found all placed in the/opt/www/aaa/there are a lot of 2 level and 3 levels of directories and

#!/bin/shMm= ' Ps-ef|grep memcached|grep-v grep|wc-l 'While ["$MM"-eq 0]Doecho "$ (date +%y%m%d%h%m%s), the memcached is down,try to up it" >>/data/shell/men.log/usr/bin/memcached-d-u root-m 512-p 39999-c 1024Sleep 2sMm= ' Ps-ef|grep

1.Until Loop statement#!/bin/basha=10;until [[$a-lt 0]];d oecho $a;((a--));d one;2.case Selection Statement#!/bin/bash#auto install lamp#by 2015-6-30case $1 in          apache ) echo  "Wait for install httpd server ..." yum  install http* -y;;       

1) Judgment expressionIfTest (expression is true)IfTest! expression is FalseTest expression 1–a expression 22 expressions are trueTest expression 1–o Expression 22 expressions have a true2) Judging the stringTest–n string string is not zero in

#!/bin/bash#你必须知道的shell里面关于数组的操作. Arr= ("Hello" "word" "You" "is" "a" "Good" "Boy.")#arr = (' ls ') #我喜欢这个方法. Echo "-------for----------------" forIinch ${arr[@]} Do Echo $I DoneEcho "--------for---------------" for((i=0;i${#arr [@]}; i++)) {Echo

In shell scripts, how does one write a line feed to a file, Test environment: ubuntu12.04 LTS version Echo> file.txt, This method has the same effect on bash and sh at the beginning of the script, Echo-e> file.txt is only applicable to bash.

Shell Script Programming #! /Bin/bash # Fibonacci sequence # Do not use recursion. If the depth is greater than 30, it will get old. Function fun_test () {if [$1-lt 3]; then echo 1 return fi sum1 = 1 sum2 = 1 let count = $1-2 sum = 0 while [$ count-

Shell Script Programming #! /Bin/bash # Fibonacci sequence # Do not use recursion. If the depth is greater than 30, it will get old. Function fun_test () {if [$1-lt 3]; then echo 1 return fi sum1 = 1 sum2 = 1 let count = $1-2 sum = 0 while [$