Shell

This article mainly introduced 8 practical shell script sharing, this article has given the judgment input number character, the character or other, asks the average, the self decrement output, adds the prefix in the file, the batch test file

This article mainly introduces the shell script to empty more than 1G log files, this article directly gives the implementation code, the need for friends can refer to the following A question about how to automatically delete a specified file

This article describes a shell script for uppercase and lowercase conversions, learning the use of commands such as TR, awk, and sed. Have a friend in need of reference under The following script allows you to convert directories or file uppercase

1 if statement echo "Please input X" Read X echo "Please input Y" Read Y If [$x-gt $y]; In the [] condition, there must be a space before the [only space is followed]. Only a semicolon can be available, or there can be no semicolon Then echo "

1, teach you to reduce the external appearance of the notebook wear A good notebook how to maintain their own shell, must be a good packaging, and notebook is the same, you need a good quality notebook outsourcing and a soft notebook bag to protect

In bash, Bash's math is a little awkward, it's hard to adapt and remember, so you have to write a blog post to make it easier to look through. There are four ways to perform mathematical operations: A, let order Copy Code code as follows:

1. Take today's time Copy Code code as follows: $date-D "Now" +%y-%m-%d 2. Take yesterday time Copy Code code as follows: $date-D "Yesterday" +%y-%m-%d $date-D "1 days ago" +%y-%m-%d # # D,--date=string

Unlike Java, PHP and other languages, the process control of SH is not NULL, such as: Copy Code code as follows: if (Isset ($_get["Q"])) { Search (q); } else { Doing nothing } ?> You can't write this in Sh/bash,

A period of time before a batch to modify the file name, is a Debian file server, for the Mac to provide file sharing services, the Chinese part of the Use of encoding (check the data, should be, not to actually verify), the specific coding

logical operators logical operators used in [] and test logical operators used in [[]] Description -A && And and, both ends are true, then true -O || Or OR, at both ends

The terminal realizes the reading and writing of the data stream in the file;The list of REDIRECT commands is as follows: Command Description Command > File Redirects the output to file. Write terminal data

Like many of my classmates, I was confused shell programming before I learned shell programming, but I didn't know what it could do, but I felt I could use a different way to manage the system. Now I slowly understand the importance of the shell for

#!/bin/SHroot_src=$(dirname$ (PWD))Echo${root_src}image_path=${root_src}/ImagesEcho${image_path}#Find${image_path}-name *.png-execEcho {} \;# Find${image_path}-name"*.png"-o-name"*.hhh"-execEcho {} \;# Find${image_path}-regex'*.png\|*.jpg'-execEcho{}

Exercise: Write a scriptDetermine if there is a user's default shell for bash on the current system;If so, the number of such users is displayed, otherwise, no such user is shown;#!/bin/bash#grep '\'/etc/passwd&>/dev/NULLRETVAL=$?if[$RETVAL-eq0];

You can often see them in a scheduled task. Examples of our company's planning tasks include:*/2 * * * * * root cd/opt/xxxx/test_s1/html/xxxx/admin; PHP index.php task Testone >/dev/null2>&1*/2 * * * * Root cd/opt/xxxx/test _s1/html/xxxx/admin; PHP

Tag: One put BSP compresses rect permissions. GZ mnt gzip8th: Shell script Archiving and compressionRegular backups are not trivial, and we can automate backup through shell scripting. Where data backup is generally used to archive and compression,

#!/bin/Bashmysql='mysql-u***-p***-hws5 Account'tmp="tmp"Resultsource="Resultsource"resultdest="resultdest"Echo "Select User_id,phone_num,email from user_accounts where length (user_id) = one limit 1"|${mysql} >${tmp}sed '1d'${TMP} >${resultsource}>${

The shell variable $# in Linux,[email protected], the meaning of $0,$1,$2 is explainedExcerpt from: Abs_guide The meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained:Variable Description:$$The PID of the

#!/bin/bash ## description:  the script function, cycle in weeks; Friday full backup, Saturday No backup, Sunday to Thursday differential backup;#                due to work needs, do not implement compression packaging method, using CP full backup,

Shell scripts to bulk operate Linux hosts:I. Introduction to the Environment:Turn on 192.168.100.150-152 (ctos1-3) and 192.168.100.100 (VSFTPD).1.SSH Login: Operate on 192.168.100.1001) Password login 192.168.100.150:SSH [email protected] #