Shell

Positional parameters can be moved left with the shift command. For example, shift 3 means that the original $ $ is now $, the original $ $, and so on, the original $ $, $ $, $ $ no move. The shift command with no parameters is equal to shift

#!/bin/sh# **************************************************# * * * Libraries# **************************************************Source/etc/profile;Sleep 2Date= ' date + '%f_%h:%m ' If [x$1!= "X"]ThenDate=$1Fi Echo $DATE Basedir= ' DirName $ 'CD

#!/bin/bash #你值得收藏的四则表达式运算. val1=1 val2=1 val3=1 val4=1 val5=1 val6=1 let val7=1 ((val1++)) val3=$ (($val 3+1)) val4= ' expr $val 4 + 1 ' val5= ' bcecho ' val5= ' $val 5 echo ' val6= ' $val 6 echo ' val7= ' $val 7 You should understand the

If statementSyntax 1 If condition then command (set) fi The condition here is to use the test statement or the bracketed statement (the previous article has been summed up)Note If statement must terminate with FI Practice: #if test if ["-lt"] # "13

1. Edit detailappbackup.sh Input: #!/bin/sh#copyright (c) 2010-2011 Luoch (luocheng.cn@luocheng.cn) #Backup The detail files and update, clear logs#version 0 .1.1echo "= = Start deleting logs = =" Rm-vf ' find/opt/apache/htdocs/detail/app/log-name '

Linux for loops can use break and continue keywords to jump out of loops, consistent with Java usage a common for loop structure #语法一 for variable in value 1 value 2 value 3. Do program block done # #语法二 The for variable ' command ' do

* Inverted quotes ' and $ () * Let's demonstrate a comparison of the output results using the inverted quotes and $ () For this result, is because the $ () in $ () has escaped to get this result because of the two \=\ in the inverted

The Find command tool is used to locate files in the directory (or even the entire file system), search Path_name-option [-print-exec-ok] #find的一般格式; 1, Find command Options (-option) 1.1. Find files and directories by name (-name):cb@standalone14:~

C. Progress bar prepared by:http://blog.csdn.net/addw1/article/details/55292922 Shell writing #!/bin/bash function Bar () { i=0 bar= ' lable= (' | ') ' \ \ '-'/' index=0 while [$i-le] do #printf ' [%-100s][%d%%][%c]\r '

The writing of Linux shell scripts VI test.sh #!/bin/bash ################### . /etc/profile . ~/.bash_profile ################## Path=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin Cd/home/huaxia/syslog2db&&ruby app.rb

Original address: http://www.cnblogs.com/Gukw/archive/2012/01/16/2323417.html 1,/etc/gitconfig:[GUI] encoding = Utf-8 #代码库统一用urf-8 to display Chinese in the Git GUI[i18n] commitencoding = GB2312 #log编码, window under the default gb2312,

We renamed yesterday's log 00:00:01 every day, placed it in a specific directory, and then USR1 the information number control Nginx to regenerate a new log file Create a new shell script under directory/usr/local/nginx/logs/runlog.shNote: The file

#!/bin/bash function ergodic () {for file in ' ls ' if [D-$ '/' $file] then ergodic '/' $file else echo '/' $file >> b fi Done} init_path= "/etc/httpd" ergodic $INIT _path Some netizens replied: "If you only traverse the directory and create an

-CP and-classpath Specify the paths of other classes that the class runs on, usually the class library, the jar pack, and so on Windows semicolon ";" separated by semicolons on Linux: "Delimited." Use a little "." Represents the current path

Everyone must know how to get the sed into the shell variable However, there is a problem with passing in the path variable. #!/bin/bash export vob=/home/fesu/server sed-n '/^vob/{s/\ (vob=\). */\1 ' "$VOB" '/P} ' $VOB/scripts/build/ Makefile

First Master: Parameters: Run the HBase shell hbase Shell Parameters the shell that runs up after HBase Try to run a few orders to find out: Create ' T_person ', ' no ', ' name ' create ' t_person ', ' no ', ' name ' 0 row (s) in 2.

-B file if it exists and is a block special file, True-C file If it exists and is a character special file, True-D file if it exists and is a directory, true-e File is true if it exists-F file is true if it exists and is a rule file-G file is true

First, position variables: $ $ Gets the file name of the current execution script, including the script path.$n gets the nth parameter of the current execution script, 1~9, greater than 9, enclosed in {}, for example: ${10}.$# indicates the number

1. Command-line parameters------similar to javac parameter 1 parameter 2Java-like compiled Javac parm1 ..... In the shell, the arguments are separated from the arguments by a space. Use positional parameters to identify corresponding parameter

In the Linux shell, often input commands have a lot of similarities, even the same, if the long command, the efficiency is really very low, but can be through ctl+r, find the history of the previous input commands, it is very useful.After pressing