shell check if directory exists

1) Unix command: Although any Unix command can be used in shell scripts, some more common commands are used. These commands are usually used for file and text operations. Common command syntax and functions: Echo"Some text": print the text on

Use shell script to monitor whether a process exists without a startup instance, first on the code dry: #!/bin/sh ps-fe|grep processstring |grep-v grep if [$-ne 0] then echo "START process ..." elseecho "runing ..." fi

Shell basic syntax Basic shell Syntax:Like advanced programming languages, shell also provides instructions and functions for using variables.For shell, the value of all variables is a string, and the shell program uses $ VaRReference the value

Copy Code code as follows: #!/bin/sh Mypath= "/var/log/httpd/" Myfile= "/var/log/httpd/access.log" #这里的-x parameter to determine whether $mypath exists and has executable permissions if [!-X "$myPath"]; Then mkdir "$myPath"

#!/bin/shPs-fe|grep processstring |grep-v grepIf [$?-ne 0]Thenecho "START process ..."Elseecho "Runing ..."Fi#####Processstring represents a process feature string that can be queried for a unique process's characteristic string0 indicates the

Using a shell to determine whether a device node exists, such as inserting a 4G Modem Sierra module into a Linux system, generates a series of TTY devices, typically with a command to send and receive at. For example, a device node is a/DEV/TTYUSB2

Use shell script to monitor whether a process exists without a startup instance, first on the code dry: #!/bin/shPs-fe|grep processstring |grep-v grepIf [$?-ne 0]Thenecho "START process ..."Elseecho "Runing ..."Fi#####Processstring represents a

There are multiple shells in Linux, where Bash is used by default. This chapter describes how shell works, shell types, General Shell operations, and bash features. Shell is the interface between the user and the Linux operating system. There are

Shell is the interface between the user and the Linux operating system. There are multiple shells in Linux, where Bash is used by default. This chapter describes how shell works, shell types, General Shell operations, and bash features. Shell is the

Transferred from: http://cqfish.blog.51cto.com/622299/187188Article Source: http://hi.baidu.com/haigang/blog/item/e5f582262d639c118b82a167.html#!/bin/shMypath= "/var/log/httpd/"Myfile= "/var/log/httpd/access.log"#这里的-x parameter determines whether