Shell

Reprinted from Matchless Castle | Demon Angel When the shell edits the script, the runtime appears "': not a valid identifier", or it will appear (: Command not found, many inexplicable symbols) it is likely that you are editing under Windows,

Array variable read-only variable delete variable environment and shell variable I'm finally going to start writing shell scripts. Array Variables Create an array variable by assigning values directly to the array's index: Array[index]=value Note:

Test can be understood to be the same as [], [[]] in logic and logic or at times, it can be split into multiple [] [Cmd-a cmd] #!/bin/bash a=23; If [$a-gt 18-a $a-lt] then echo ' Young && handsome ' else echo ' Just so ... " fi

Http://www.ha97.com/4021.html 1. Delete 0-byte filesFind-type f-size 0-exec rm-rf {}; 2. View processArrange by memory from large to smallPS-E-O "%c:%p:%z:%a" |sort-k5-nr 3. By CPU utilization from large to small arrangementPS-E-O "%c:%p:%z:%a"

For a host system, there will be some inaccessible users in the system, but they must also exist, what we call the inability to log on, is that this user can not use bash or other shell to login to the system, not that this account can not use other

The loop structure under the Shell is Class C, also has a for loop, while loop, in addition, the shell also has a until loop. For Loop the basic syntax for a for loop For variable in {list} do statement1 statement2 ... Done The syntax

Brief Introduction Sed is an online editor that handles a single line of content at a time. When processing, the currently processed rows are stored in a temporary buffer, known as pattern spaces, followed by the SED command to handle the contents

Judgment file:Workdir=/home/tmplocal_list_file= $WORKDIR/local.list#if no Local.txt file, generate a new oneif [!-F "$LOCAL _list_file"]; ThenTouch $LOCAL _list_fileFiNote: Be sure to have a space, to determine whether the file exists, if it does

Cat pushfiletoremoteservice.sh #!/bin/sh Basedir= "' DirName $ '" arg_cnt=$#If [$ARG _cnt-lt 3]; Then echo "Please use: $ dst_ip sshuser path_app-core" echo "Eg: $1.1.1.1 user/opt/app-core/" Exit fidst_ip=$1; dst_user=$2;if [[[] $ =~. *[^/]$]];

Original:Http://blog.pureisle.net/archives/1352.html The Shell provides a large number of basic operations that are useful in scripting. The Shell evaluates the arithmetic expression you provide, performs an operation expansion, and replaces an

Linux Shell string interception is useful, there are eight ways: Assuming there are variable var=http://www.aaa.com/123.htm 1. # Intercept, delete left character, keep right character. Echo ${var#*//} where Var is the variable name, # is the

 In recent time, when dealing with shell scripts, encountered time processing problems. The addition and subtraction of time, as well as the calculation of timing. 1. Time plus minus The way to do this is to turn the base time into a timestamp,

#!/bin/sh For f in * Todo MV $f ' echo $f | TR "[: Upper:]" [: Lower:] "' Done ---------------------------------------------------------- [: Upper:] [A-z] [: Lower:] [A-z] [:d Igit:] [0-9] [: Alnum:] [0-9 A-z] [: space:] spaces or t a b keys [:

Today, the script on the company server to get its own notebook on the run error, set-x tracking discovery is a variable in the self-increase operation error occurred, the error section of the script is probably like this: #! /bin/sh param=0

Gathen: 397706991, learning together Conf/hive.xml Specific shell code Download: http://download.csdn.net/detail/luo849278597/9490920 create table if not exists think_statistics (date_type_name string,date_name string,type int,type_ Name

Http://www.cnblogs.com/davidwang456/p/3784102.html http://blog.csdn.net/yucan1001/article/details/8455757 http://blog.163.com/yangfan876@126/blog/static/806124562013720104712282/ 1, dirs1) functionDisplays all records in the current directory

Http://www.cnblogs.com/wangkangluo1/archive/2011/09/23/2185938.html Name: PSUsage rights: All usersHow to use: PS [options] [--help]Description: Shows the dynamics of the instantaneous stroke (process)Parameters: The parameters of PS are very many,

PrefaceThere is a problem with working today, if you copy the file in directory A to directory B (without the file in directory B), and keep the file structure in directory A. The project focuses on the following: You need to keep the structure of

Enter HBase Shell console $HBASE _home/bin/hbase Shell If you have Kerberos authentication, you need to use the appropriate keytab for authentication (using the Kinit command), and then use the HBase shell to enter the certificate successfully. You

Gets the names of all the folders under the specified directory/usr/and outputs: Shell code: 1 #!/bin/bash 2 #方法一 3 dir=$ (ls-l/usr/|awk '/^d/{print $NF} ') 4 for I in $dir 5 do 6 echo $i 7 done 8 ####### 9 #方法二 -dir in $ (ls/usr/)