file exists

Alibabacloud.com offers a wide variety of articles about file exists, easily find your file exists information here online.

The meaning of the-Z to-D in the conditional judgment in the shell

The meaning of the-Z to-D in the conditional judgment in the shell [-A file] if FILE existence is true. [-B-file] True if file exists and is a block-specific file. [-C file] is true if file exists and is a word special file. [-D file] is true if

The meaning of the-Z to-D in the conditional judgment in the shell

The meaning of the-Z to-D in the conditional judgment in the shell Copyright Notice: This article original articles for bloggers, repost please indicate the source. If in doubt, please contact me. I'll be appreciated.

If condition judgment for Linuxshell scripts

If condition judgment for Linuxshell scriptsIF condition judgment1. Basic Syntax:If [command]; thenStatements that meet this conditionFi2. Extended Syntax:If [command]; thenStatements that meet this conditionElif [command]; thenStatements that meet

If condition judgment of Linux shell script, linuxshell

If condition judgment of Linux shell script, linuxshellIF condition judgment1. Basic Syntax:If [command]; thenStatements that meet this conditionFi 2. Extended Syntax: If [command]; then Statements that meet this condition Elif [command];

Shell comparison and judgment

Comparison and judgment are the elements of program flow control. This article summarizes shell comparison and judgment statements for ease of searching and using. 1. Important comparison Operators Greater than:-GT Less than:-lt Greater than

Linux System Bash (Shell) Basics (3)

Arithmetic operations are undoubtedly very important in shell scripting programming;The command to perform an integer arithmetic operation in bash is let, which has the syntax format:Let Arg ...Arg is a complete arithmetic expression consisting of a

Shell determines whether a file or folder exists

#!/bin/sh mypath= "/var/log/httpd/" myfile= "/var/log/httpd/access.log" #这里的-x parameter Judging $ Whether the MyPath exists and has enforceable permissions if [!-X ' $myPath]; then mkdir "$myPath" fi #这里的-D parameter to determine if

Some conditions of the shell judge

1. Shell to determine the file, whether the directory exists or has permissions2. #!/bin/sh3.4. Mypath= "/var/log/httpd/"5. myfile= "/var/log/httpd/access.log"6.7. # the-x parameter here determines whether the $mypath exists and has executable

Shell Test []

Http://man.linuxde.net/testHttp://blog.chinaunix.net/uid-24780853-id-2578709.html[email protected] ~]# man testtest (1) User Commands Test (1) NAME test - Check file types and compare Valuessynopsis Test EXPRESSION t EST [EXPRESSION] []

Shell Scripting Learning

Startup script start.sh This script is used to start the project, log logs and PID#!/bin/shprg=" $" #$ A represents the current startup script # Get the true path of the file while[-H"$PRG"]; Dols= ' Ls-ld"$PRG"' link= ' Expr"$ls": ' .*-> \ (. *\) $"

Usage of the test command in Unix

Function of the test Command: check files and compare values. 1. determine the expression iftest (the expression is true) iftest! (Expression is false) test expression 1-a expression 2 both are true test expression 1-o expression 2 two expressions

Shell condition judgment

first, the numerical judgmentInt1-eq INT2 INT1 and INT2 two number equal true Int1-ne INT2 INT1 and INT2 two number of true int1-gt INT2 INT1 greater than INT1 for true int1-g e INT2 INT1 greater than or equal to INT2 trueInt1-lt INT2 INT1 Less than

Commonly used condition judgment in linuxShell

Commonly used condition judgment in linuxShell-bfile if the file exists and is a special block file, it is true-cfile if the file exists and is a special character file, true-dfile if the file exists and is a directory, it is true-e... information &

Test switch and special parameters in Shell script, shell script

Test switch and special parameters in Shell script, shell script1. Test Switch The following table lists the meanings of the test commands and whether they can be used in test commands, bash, and ksh. Switch Test Bash Ksh

Required for O & M-Common Operations (queries are provided for friends and will be updated continuously)

Micro Blog: http://xsboke.blog.51cto.com Xiaosheng Q: 1770058260 ------- Thank you for your reference. If you have any questions, please contact us. MySQL # Mysql Data Import and Export # The queried data is exported to the CSV file select *

The IF condition of the Linux shell script is judged

If condition judgment1. Basic syntax:if [command]; ThenStatements that meet the criteria for executionFi2. Extended syntax:if [command];thenStatements that meet the criteria for executionelif [Command];thenStatements that meet the criteria for

The shell determines whether a file or directory exists

Shell Determines whether a file exists1. Shell to determine the file, whether the directory exists or has permissions2. #!/bin/sh3.4. Mypath= "/var/log/httpd/"5. Myfile= "/var/log/httpd/access.log"6.7. # the-x parameter here determines whether the

Conditional judgment in Bourne shell

Conditional judgment is the basis for a program to gain intelligence, while the Bourne shell script simulates conditional expressions in most programming languages by command.The control structures supported in the shell are:(1) If then else fi(2)

Usage of the test command in Linux Shell

 Basic Format:Test expression Expression is the expression constructed by the test command.Expression is any valid expression that can be understood by the test command. The simplified format is the most common format that readers may refer.Return

(027) The Shell branch if statement for Linux

Fundamentals of the ten-year OPS series-LinuxZeng LinContact: [Email protected]Website: www.jplatformx.comCopyright: Please do not reprint the article without permission first, use the IF statementThrough the shell, we can write a shell script

Total Pages: 15 1 .... 11 12 13 14 15 Go to: Go

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.