Shell

Transferred from: http://blog.csdn.net/huanbia/article/details/51318278Problem description When using SECURECRT to open Spark-shell, sometimes the following problems, when the wrong time to press the BACKSPACE (BACKSPACE) or delete (delete key),

#发送邮件函数function Send_mail () {#定义邮件发送列表maillist = ([email protected][email protected][email protected]) if ["$" = = "Gateway"]; Then to mail in ${maillist[*]};d o echo "Cannot ping gateway, check network" |                Mail-s "PI (10.78.1.122)

#!/bin/bash# lty 20180116# fastdfs install scriptif [  ' Id -u '  -ne  0 ];then    echo  "Non-root user, script exit"     exit 0fiif  [ ! -f  "/root/soft/fastdfs_install.sh"  ];then    echo  " Reinstall the installation script side after

Backs up all modified files in the current directory within the last 24 hours in a "tarball" (Files that have been processed by tar and gzip).The program code is as follows:#!/bin/bashBACKUPFILE=backup-$(date +%y-%m-%d)#

1. What is a shell?Open the system, enter ZS, press the Tab key, the command Zsoelim appears,Description No zsh command, this time can be installed, first enter the command yum list |grep zsh, enter, search,You can see that there are zsh commands,

Shell Variables1. Order env to list all system variables (all uppercase letters) of system presets2. The command set can see the variables that are preset by the system, or you can see the user-defined variables.3. Custom variables:Rules for

#!/bin/bashif [$]thenbackup_level=$1elsebackup_level=0fibackup_user=sysbackup_user_pw=oracle#catalog_user=rman #catalog_user_pw =rmanlog_file=/oracle/admin/$ORACLE _sid/rman_backup.logecho "Beginning rman backup ..." > $log _ filedata>> $log

#!/bin/bashbackup_dir=/oracle/backuplog_file= $ORACLE _base/admin/$ORACLE _sid/cold_backup_$oracle_sid.logecho   "Backuping cold backup"  > $log _filedata>> $log _filesqlplus -s /  As sysdba > $log _fileset pagesize 0 linesize 1000 

Signal list:Common commands related to Linux and signaling are the kill and trap commands, down how to use traps to control the springboard script using the command:Command: Kill-l and Trap-lImportant signal and explanation of Linux system in

Bash Digital Computing--Digital processing power is critical for any programming language, but for bash shell scripts, this ability is poor, even if the form of Expr command and $[] can only be used for integer operations, the operation of

The set command sets the parameter variables for the shell. The output of many commands is a space-delimited value, and using set is very effective if you want to use one of these data fields.#!/bin/shecho the date is $ (date)Set $ (date)echo the

Using Nginx log file to count all IP and PV, list the top 10 IP, take confluence Knowledge base system as an example:Nginx log file is/var/log/nginx/access.log# wc -l /var/log/nginx/access.log 95146 /var/log/nginx/access.logShell script:# vim

Exercise 1: Counting Memory usageRequirements: Write a script that calculates the amount of memory that is consumed by all processes in the Linux system. (Hint: use PS or top command)Reference Answer:#!/bin/bash# date:2018 February 6 # using top to

File expression-e filename true if filename exists-d filename If filename is a directory, true-F filename True if filename is a regular file-L filename True if filename is a symbolic link-r filename If filename is readable, true-W filename if

One, for-done (not very common)1. GrammarFor variable in name table do ... done2. Script Sample Code#!/bin/shfor num in 1 2 3 4 5do echo "number is $num" done3. Execute script[Email protected]]# sh hello.sh4. Implementation resultsThe number

common syntax for conditional testing: Syntax format Description [] [] has at least one space between the boundary and the content [[ ]] [[] There is at least one space between the

1. For Loop statement:Two common ways to use for: notation (1): for inch 1 2 3 4 5 (PS in $ (seq15 in {1). 5 }) do echo"$val " DoneNotation (2):　　 for ((i=0;i; i++)) ( PS: Must Be for (()) ) { "val=i%2"

Using shell functions to develop the Rsync service startup script, previously unprofessional#!/bin/bash#chkconfig: 2345  20 80                         #这两行加入kconfig #description:  saves and restores system entropy  poolsource /etc/init.d/functions   

Power ShellNote: The following content is written on a non-Windows platform, there may be spelling errors, if any, please correct me, I will amend as soon as possible. It can be implemented using the PowerShell configuration file (\ Profile). \)The

Is the shell script used to determine whether the strings are equal? (Code instance), shell scriptShell script to determine whether the strings are equal Basic Elements 1) Declaration of variables 2) Use of if Statements 3) Use of echo 2. The