Shell

Suppose we define a variable as:Copy the Code code as follows:File=/dir1/dir2/dir3/my.file.txtDifferent values can be replaced with ${}, respectively:Copy the Code code as follows:${file#*/}: Delete the first/its left string:

Linux Modify shell command prompt and color1. Load the configuration file sequence during the Linux login process:/ETC/PROFILE→/ETC/PROFILE.D/*.SH→~/.BASH_PROFILE→~/.BASHRC→[/ETC/BASHRC]You can view the default ~/.BASHRC file as follows:[Root@~/wade/

01. Field Extraction Command Cut + = cut [option] file name-F Column Number: Extract the first few columns-D delimiter: Splitting columns by the specified separatorFor example: Cut-f 2,4 (column number;, comma can extract multiple rows)

1. Write Script/root/bin/sumid.sh, calculate the sum of the ID of the 10th user and the 20th user in the/etc/passwd fileSolution: vim/root/bin/sumid.sh#!/bin/bashTenuser= ' cat/etc/passwd | Head-n10 | Tail-n1 |cut-d:-f3 'Twentyuser= ' cat/etc/passwd

Shell Basicsfirst, what is the shell1. is a command interpreter that provides interaction between the user and the machine2. Support for specific syntax, such as logical judgment, looping3. Each user can have their own specific shell4. Default to

Requirements: Query all files under a folder, change the file modification time to less than the current time, and be larger than the current time the previous day of the file backup to another server corresponding to the folderIdeas:1, recursive

I. Basic introduction to Shell programming 1.1shell programmingThe shell is an interface that the user interacts with the kernel, and the most popular shell is now called the Bash shellThe shell is also a programming language interpreted

Shell Programming Concepts(1) Shell is a command-line interpreter, there are many kinds of shells(2) The shell as a bridge between the Linux kernel and the user, the user by default cannot directly manipulate the kernel(3) can be operated through

Shell Special Symbols* Any of any characters[[email protected] ~]# ls *.txt1.txt 23.txt 2.txt David.txt? Any one character[email protected] ~]# ls?. Txt1.txt 2.txt# comment Characters[[email protected] ~]# #echo ' OK '\ de-Semantic characters[Email

Sshpass This software is for SSH to provide a password to useYum Install sshpass- yBulk distribution of script content#!/bin/bash. /etc/rc.d/init.d/functions# Create key\rm ~/.ssh/id_rsa*-FSsh-keygen-t rsa-f ~/.ssh/id_rsa-n ""-Q# Distributing

The task to be done is to process files of a similar format and extract each month and day to the end of each line (cleaned)The idea is to first use the cut command to each line of the month and day of the hour to extract, give a variable, and then

The problem is that environment variables are not accurately(1) Check that the maven you set in Jenkins is accurate, and you can see if there is a MAVEN option in the new job with the "New Job" button, not exactly what you configuredIf you download

#!/bin/shdomain= ' echo $1|awk-f '. " ' {print $ '. $ "." $ "."} ' ' Start_ip= ' echo $1|awk-f "." ' {print $4} ' end_ip= ' echo $2|awk-f '. " ' {print $4} ' echo ' domain is $domain ' function Scan () { ping-c 1 $1$2 >/dev/null && echo "$ is

Recently in the design of a Linux system scenario, write a configuration and log management of the upgrade service program.A total of 4 files, Server a updateserver.conf configuration file and a updateserver script, a updateclinet.conf configuration

(a) accept an input, judging is not a date, the user's input can be 2017-10-1 or 2017.10.1 or 2017/10/1The shell code is as follows#!/bin/bashRead-p "Input:" DateA= ' echo $date | Awk-f ' [./-] ' {print $ '/' $ '/' $ $} 'Date-d $a &>/dev/nullIf

Touch commandThe touch command is used to create empty files, such as when an application wants a log file to exist before they can write to the data. You can create an empty file with the touch command: touch test1 ;The touch command can also be

Topic (i)There are 1 2 3 44 digits, any combination of how many different and no duplicates of the number, what is the difference?The shell code is as follows:#!/bin/bashFor i in ' seq 4 'DoFor x in ' SEQ 4 'DoFor y in ' seq 4 'Do[$x-eq $i] &&

Regular expressions for 4. shell Basics     4.1  Regular strings are a string of rules          4.1 grep             4.1.1  Format: grep [-cinrvabc]  ' word '  filename             4.1.2 -c //count, indicating number of rows           

Because the company Ali server changes several times, manually deployed several times Fastdfs+nginx, so think of the automated deployment, the following is the script content, because just want to implement the function, has not completed the

[Email protected] src]# RPM-QPL epel-release-latest-6.noarch.rpm # #查询该rpm包安装了什么Warning:epel-release-latest-6.noarch.rpm:header V3 rsa/sha256 Signature, key ID 0608b895:nokey/etc/pki/rpm-gpg/rpm-gpg-key-epel-6/etc/rpm/macros.ghc-srpm/etc/yum.repos.d/