best shell scripting book

=" Wkiom1dpl2tdsdtraaaoaz2doqg510.png "/>2. Progress barTo write a simulation progress bar using a shell script:#!/bin/bashstr= "" Arr= ('-"\" | "'/')//define array to simulate cursor rotation for ((i=1; iTo run the program:650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M01/83/0A/wKioL1dpMCOgKMMxAAAJrNtGHEA737.png "style=" float: none; "title=" Shell3.png "alt=" Wkiol1dpmcogkmmxaaajrntghea737.png "/>650) this.width=650; "src=" Http://s4.51cto.

Tags: bash TEST word exp commit username RIP ACL insertzabbix#vi/opt/script/conf/config.shname_pw= ' Username/password 'Export NAME_PWzabbix#vi/opt/script/logger.sh#!/bin/bash. /opt/script/conf/config.shExport Oracle_sid=oracle1 #数据库实例名Export oracle_home=/oracle/procduct/9.2Su oracle-c "${oracle_home}/bin/sqlplus-s/nolog" SET FEEDBACK OFF;SET ECHO OFF;CONN $NAME _PWInsert into Table_test (id,date.messages) VALUES (' $! ', Sysdate, ' $ $ ') #向表table_test中插入数据CommitExitEofzabbix#sh/opt/script/logg

Share a recently written shell script that enables you to back up the production line files and rollback operations by the file directory structure of the published package.1#!/bin/SH2Path="/home/www/site1"3pub= $path"/release/pub/mboxii/trunk"#发布目录4bak= $path"/release/bak"#生产目录备份文件5Prod=$path #生产目录6pub_file_plus= $path"/release/pub_plus.txt"#增量文件: Publish a new file list log for a package relative to the production package7 8 #执行备份9 Dobak () {Ten #删除

Tags: Configuration ideas nbsp Script Practice post awk bash judgment comparison#!/bin/Bash while : DoRead-P">>>"user [["$user"="Q"]] || [["$user"="Q"]] Break [[-Z $user]] ContinueID$user >/dev/NULL [[ $? -eq0]] Cat/etc/passwd|awk-F:'{print $, $NF}'|grep$user | |Echo "User not exist" DoneThe script implements the target to determine whether the user existsMain ideasThe while do statement implements the loopAdd variable $user exit mechanism use "| |", "", respectively, with operations and or o

the same as [].(4) between multiple [] and multiple [[]], or any of the mixed intermediate logical operators are or | |.1.5 General Examples:(1) Compare the size of the two integers by defining variables, script arguments, and read-in in a conditional expression (prohibit using if) and alerting the user to the results in the form of a screen output. A total of 3 scripts developed, when using script to pass the parameter and read in the way you need to be a variable is a number, and not to give

seconds, in the shell script of the usual term loop.At this point, you press CTRL +z to pause it, and then enter BG to go back into the background.In the case of multitasking, if you want to move the task to the foreground, FG is followed by the task number and the task number can be obtained using the jobs command.9. >>, 2>, 2>> : The above-mentioned directional symbols > and >> denote the meaning of substitution and addition, then there are two sym

Shell scripting is an essential skill for Linux OPS engineers and a very important skill, so it's only good to learn shell programming well. Basic grammar I will not speak, learn the C language of these languages, a little bit to understand the basis of shell programming, so we directly cut to the point.The 20th day of

only numbers, letters, or underscores, and cannot start with a number3, as far as possible to see the name of the ideaVI. Bash configuration files1. Profileclass : Provides configuration for the interactive login shell process.• Valid profiles for all users are globally valid:/etc/profile and/etc/profile.d/*.sh• Only the profile that is valid for the current user is valid for the user: ~/bash_profileNote: The function of profile type configuration fi

environmental changes to the parent shell. 2. Use parentheses () Running a command in () also opens a child shell. So do not randomly write () in Linux to change the priority, unless it is escaped, and the parentheses after the turn to have a space between the contents of the parentheses. [Email protected] tmp]# echo $BASH _subshell 0 [Email protected] tmp]# (echo $BASH _subshell) 1 ? Description opens a

out the last/and left string: my.file.txt${file#*.} Take out the first one. And the string to the left: file.txt${file##*.} Take off the last one. And the string to the left: txt${file%/*} take out the last/And right string:/dir1/dir2/dir3${file%%/*} take out the first/and the right string: (null value)${file%.*} take off the last one. And the string to the right:/dir1/dir2/dir3/my.file${file%%.*} take off the first one. And the string to the right:/dir1/dir2/dir3/myTest.sh:File=dir1/dir2/dir3/

been set. [-H file] True if file exists and is a symbolic connection. [-K file] True if file exists and the sticky bit has been set. [-P file] If file exists and is a name pipe (f if O) is true. [-R File] True if file exists and is readable. [-S file] True if file exists and the size is not 0. [-T FD] true if the file descriptor FD is open and points to a terminal. [-u file] True if file exists and suid (set user ID) is set. [-W file] True if file exists and is writable. [-X file] True if file

result is"$sum; Filearray=`ls./files/*. txt '; for file in $filearraydoecho $filedone11. Shake the PanFinally, I wish you ...Because other execution statements can be arbitrarily inserted into the shell script, we can sometimes ask the high-level language or other familiar script to perform some operations. This is where the shell is powerful and flexible.For example, we can write a C + + file#include type

Tags: distinguishing string roo Interactive process%s usage definition function efficiencyFirst, Shell script introductionThe shell is a scripting language, and the shell is a collection of system commands1, can use logic judgment, cycle and other grammar;It's a bit like C language, but it's fundamentally different.2,

command willSHELLmeta-characters are expanded. 4. In the double-brace Test command, if a string (with or without a space) is simply the expression as a normal string, not part of a pattern, it must also be enclosed in quotation marks. If a string value (the one on the right) is not enclosed in double quotes, the string is a pattern, and if it contains SHELL metacharacters, bash expands it. If the string is double-quoted, it is a very ordinary string

substitution or deletion stty locale display locale settings # Replace the "ABC" that appears in the file with "XYZ"Cat file| tr "Abc" "Xyz"> New_file# Use the TR command to "unify" the case of lettersCat file| tr [A-z] [a-z] > New_fileCat file| tr [A-z] [a-z] > New_file# Replace the number 0-9 in the file with A-jCat file| tr [0-9] [a-j] > New_file# Delete the "Snail" characters that appear in file files

redirect to generate a patch file:[Email protected]:~/dl$ diff-u version1.txt version2.txt > Version.patch[Email protected]:~/dl$ cat Version.patch---version1.txt 2015-12-28 19:16:28.866869790 +0800+ + + version2.txt 2015-12-28 19:17:12.078872041 +0800@@ -1,5 +1,5 @@This is the original text-line2-line3+lin2Line4Happy hacking!+gnu is not UNIXUse the following command to Patch:[Email protected]:~/dl$ patch-p1 Version1.txt Patching file Version1.txt[Email protected]:~/dl$ cat Version1.txtThis is

value of a running process Renice-n PIDNohup SH executes scripts in the backgroundCtrl Z hangs a foreground processFG Job Number The file foreground runs the BG job number to run the file background/proc DirectoryShell Scripts Scripta shell script is a text file that contains a shell directiveShell and oh ah this supports variables with simple syntax to complete batch workHow

function is like a mini script that can be passed when calling a functionAny parameter, within the function is also used to extract parameters such as $, $, $, etc., the position parameter in the function is equivalent to the functionLocal variables, changing these variables does not affect variables such as $, $, $, and so on outside the function. function, you can use returnCommand returns if the return followed by a number represents the exit Status of the function.For example:650) this.widt

No orders found. 128 Invalid exit parameter 128+x Critical error for Linux signal x 130 Command terminated with CTRL + C 255 Exit status code out of bounds Exit Exit command can specify exit status code, but not more than 255, otherwise it will be moduloCode 1-16[Email protected]:/data# cat Demo4 #!/bin/bashdateecho $?whoexit 5[email protected]:/data#./demo4 Fri Dec 2 05:03:08 CST 20160root pts/

included file test1.sh does not require executable permissionsRun a python script in a shell scriptTry to run the Python script in the shell script, if the Python script contains the shell's illegal statements, the above mentioned two methods are not possible, this may indicate that the above method is only for Shell script calls. It is also convenient to run Py