Shell

Script Programming Control Structure:OrderSelect: If, caseLoops: For, while, untilFor variable in List;doStatementDoneFor ((CONDITION));d oStatementDoneWhile Condition;doStatementDoneUntil Condition;doStatementDoneLoop Example: Test whether all

Directly on the script,Use $ (()) and $[] for numeric calculationsNumerical comparison:N1-eq n2 Check if N1 equals N2 n1-le n2 check N1 is less than or equal to N2N1-ge n2 Check if N1 is greater than or equal to N2 n1-lt n2 check N1 is less than N2N1

ip= "192.168.5.166"SSH $ip-o stricthostkeychecking=no//SSH login do not enter "Yes"Port= "26092"Pid= ' Netstat-anlp|grep $port |awk ' {print $7} ' |awk-f '/' ' {print '} 'Pname= ' ps-ef|grep $pid |grep-v grep|awk ' {print $NF} 'Dir= '

1 Invoke MdoelsimIn order to open Modelsim automatically, it's better to use a shell script to invoke Modelsim.1 #!/bin/bash 2 #----------------------------------------------------------------------------3 # Invoke Modelsim 4 #-----------------------

. Cat commands"Cat" stands for Nexus (concatenation), connects two or more text files, or prints the contents of a file in standard output form.. CP command"Copy" is the copy. It copies one file from one place to another.MV CommandThe "MV" command

While Loop :Description: The while loop is an indeterminate loop, also known as a conditional loop. As long as the condition is judged, the loop will continue to execute until the condition is judged, and the loop will stop, which is not the same as

Logon shell and non-logon shell read file procedureLogin:/etc/profile→/etc/profile.d/*.sh ~/.bash_profileNon-login: ~/.BASH_PROFILE→~/.BASFRC→/ETC/BASHRC#soure. Bash_profile Manual Update/etc/profile valid environment variables for general

when using Find, just write the desired action in a file, you can use the exec to match the Find lookup, very convenient (In some operating systems only the-e x E C option is allowed to execute commands such as L s or ls-l). Most users use

Forwarding: Linux Shell's && | | When the shell executes a command, it returns a return value that is saved in the shell variable $? In When $? = = 0 o'clock, indicating successful execution;   = = 1 o'clock, which indicates that the execution

http://blog.csdn.net/qyf_5445/article/details/8886071Custom variablesNo type distinction in bash variablesAa=abc123 define variables and assign values abc123Aa= defines an empty variable or empties the variable AA, but the variable still

Variables can be set in the shell environment for easy user use. The user can customize the variables, which can be implemented directly in the shell environment through simple syntax, for example: "x=100" and so on. At the same time, there are

awk command# awk ' Condition 1{action 1} Condition 2{action 2} .... ' FilenameGeneral use of relational expressions as criteriaAction: 1, formatted output 2, Flow control statement column that handles the cut command cannot intercept spacesExample:

I. Basic conditions of judgment1) Logical operators-A expr1-a expr2 logic and-O expr1-o expr2 logic or! !EXPR1 Logical Non-2) Numerical judgment-eq num1-eq num2 is equal-ne Num1-ne num2 is not equal-GT NUM1-GT num2 is greater than-ge Num1-ge num2 is

Task Command combination 1 Delete a 0-byte file Find. -type f-size 0-exec rm-rf {} \;Find. Type F-size 0-delete 2 View processes, sorted by memory from large to small PS-E-O "%c:%p:%z:%a" |sort-k5-

First, use double brackets (()) to calculate#!/bin/bash#a=0for ((b=0; b; b++)); Do ((a=a+b)) // can also be written as a=$ ((a+b)) Done Echo $aSecond, seq, tr, sed, BC together to complete the calculation

Develop shell script to check nginx real-combat sharingFirst, this script implements the function:1, automatic check nginx under the agent node is normal2, through the page display status, the problematic node gives the page alarm and sound alarm.3,

1. Check the current system who is logged in: Who2. Count the logged-in users of the current system: who | Wc-l (L-->line,w-->word,c-->character)3. Small shell script development cycle: $cat > Nusere new file, using Cat copy terminal inputW.H.O. |

/Etc/profile and/etc/bashrc, interactive and non-interactive, the difference between login and non-login shell, bashrcnon-loginThe online memcached crashes again and still does not get the core file. Check the cause and find that the script for

Linux Shell expressions and linuxshell expressions Strictly speaking, shell does not have the expression concept. Shell itself is actually a collection of a bunch of commands. Of course it is not just a collection of random together, but a certain

Install bash shell and solarisbashshell on solarisA bash vulnerability exists in earlier versions of sun solaris, which can be solved by uninstalling or upgrading.1. All pkg installation packages:Http://mirror.opencsw.org/opencsw/allpkgs/ 2,