Shell

Positional parameters can be shift shifted left with the command. For example, the shift 3 original $4 now become $1 , the original $5 now become and $2 so on, the original $1 , $2 $3 Discard, $0 do not move. Commands with no parameters are shift

The use of SEQ in the shellExample:/bugzilla/group.00....group.99 more than 3 years of data mv to/history/bugzilla/group.00...group.99Seq-w (-w = 0 in front to make the same width)#!/bin/bashFor Inum in ' seq-w 00 99 'DoSsdir=/bugzilla/group.

#!/bin/bashbackdir=/backup/logs/' Date +%f ' catdir=/home/tomcat/apache-tomcat/logsbackfile= ' find $CATDIR-type F- Mtime +3|grep-v catalina.out ' ceshi= ' echo $BACKFILE |wc-l ' Logfile=/home/lichuang/backup.logbackup () {if [$CESHI-le 1]t hen echo

Demand Sometimes in the shell script needs some execution, if placed in the program is not easy to unified management, and every time you modify the path to the script inside to change the trouble, so the unified path in the configuration file

1. Location of shell configuration files The most commonly used shells are SH and bash, which only speak sh and bash here. 1.1. SH (Bourne Shell) configuration file has two main, respectively, each user home directory

#!/bin/bash#by lc#protnum= ' netstat-lntup|grep java |wc-l ' [email Protected]tomcat_prot () {if [' Netstat-lntup|grep Java |wc-l '-ne 9]then clear Echo-e "\033[31m############################################\033[0m" Echo-e "\033 [31m#\033[0m "" \033

#!/bin/bash#by lc#dir=/rootdir=/server/scriptsyuanfile=hins423437.tar.gzbakfile=hins423437_xtra_20.*. tar.gzlc  () {  if [  ' ls -l  $DIR |grep  "${bakfile}" |wc -l '  -eq  1 ]  then     duyuan= ' ls -l  $DIR |grep  "${YUANFILE } "|awk  ' {print $5}

Format: echo-e "\033[word background color; font Color m string \033[0m"For example:Echo-e "\033[41;36m something here \033[0m"Where 41 of the position represents the background, 36 of the position is the color of the wordThose ASCII code is the

1. Printing process [[email protected] program_test]# PS-E | HeadPID TTY Time CMD1? 00:00:03 Init2? 00:00:00 Kthreadd5 y 00:00:00 migration/06} 00:00:00 ksoftirqd/03 y 00:00:00 migration/04} 00:00:00 watchdog/07? 00:00:00 events/08? 00:00:00 Cgroup9?

1. Renaming1) Simpler processing command: MV original filename new file namesuch as: MV MyFile newName # # # will myFile renamed to NewName.2) Renaming files command: Rename name_old name_new fileFor example: Rename MyFile newName myfile.text # # # #

Shell scripts are usually text files that start with #!/bin/bash. #！ is placed before the interpreter path.Use bash as the interpreter to interpret all command-line commands.There are two ways to run a script, one is to use the script as a

Positional variables:$: Gets the file name of the current execution shell, including the script path if the script is executed with a path $n: Gets the n=1..9 parameter value of the currently executing shell script, which represents the file

1.5 Cut command--split fileCut-d:-F 3/ETC/PASSWD take 3rd paragraph1.6 Sort Command--sortSORT-T:-k3/etc/passwd sorted by 3rd paragraph-N Sort by number-R Reverse Order-U Remove Duplicate entries1.7 WC Command-L Calculation of rows-W Computed

In Linux there are many ways to read a file row by line, the most common is the method in the following script, and is the most efficient, most used method. In order to give you an intuitive feeling, we will test the execution efficiency of various

Add users in bulk and set a random password to save the added user's name and password to a file.[Email protected] scripts]#CatUser.SH #!/bin/SH forIinch`seq-W Ten` DoPass=$(Echo "' Date ' $RANDOM"|md5sum|Cut-C1-8) //Take the random number method is

Early computers because you understand the reason there are multiple physical terminals (by connecting the port of the computer what to achieve), here the terminal is the I/O device. The computer itself, which is inherently an I/O device (not an

Sometimes we need to overwrite a folder to our working directory, but need to automatically back up the existing files, one to go back to the backup is too troublesome, all the backup is not necessary. Shell scripts can do a good job of doing this.

Use digital code to color your fonts in Linux Font color code: Reset 0 , black, red, green, yellow, blue, magenta , Cyan, light grey Panax Notoginseng Effect code:1m bold 2m plus underline 5m flashing effect 7m plus background color

Chapter One: Shell Start-up basics1. Variables: In bash, the value of each variable is a string. Whenever you assign a value to a variable, there is no quotation mark, and the value is stored as a string.2, Var=value; Assignment operationvar = value;

String:1. Single quotes:str = ' value 'Single-Quote String restrictions:Any character in a single quotation mark is output as is, and the variable in the single-quote string is not valid;Single quotation marks cannot appear in single quote strings