file exists

In most cases, you can use test commands to test the conditions. For example, you can compare strings, determine whether a file exists, and whether the file is readable. The following article describes how to use BashShell to check whether a file

Shell checks whether a file exists #! /Bin/sh # shell checks whether the directory exists or has the permission mypath = "/var/log/httpd/" myfile = "/var/log/httpd/access. log "# Here, the-x parameter determines whether $ mypath exists and has

Implement code One, #!/bin/sh # to determine if a file exists # link:www.jb51.net # date:2013/2/28 mypath= '/var/log/httpd/ ' myfile= ' Var/log/httpd/access.log " # Here's the-x parameter to determine if $mypath exists and has executable

Shell determines whether a file existsThe Code is as follows:#! /Bin/sh# Determining whether a file exists# Link: www.jb51.net# Date: 2013/2/28 MyPath = "/var/log/httpd /"MyFile = "/var/log/httpd/access. log" # Here, the-x parameter determines

1. Shell checks whether a file or directory exists or has permissions 2 .#! /Bin/sh 3. 4. mypath = "/var/log/httpd /" 5. myfile = "/var/log/httpd/access. log" 6. 7. # Here, the-x parameter determines whether $ mypath exists and has executable

method One: Locate_library () {[!] "$1*" = "' echo $1* '"]; } Usage: # Look for PAM (do weirdly due to distribution bugs (e.g. Debian) or the # Crypt library. If Find_func Pam_start SYSDEPUTIL.O; Then locate_library/lib/libpam.so.0 && echo

Use the Shell to judge #!/bin/sh mypath= "/var/log/httpd/" myfile= "/var/log/httpd/access.log" #-x parameter determines whether the $mypath exists and has executable permissions if [!-X "$myPath"]; Then mkdir "$myPath" FI # Here's the-D

Transferred from: http://www.cnblogs.com/sunyubo/archive/2011/10/17/2282047.html1. 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-

-B file file exists and is block special-c file file exists and is character sp ecial-d file file exists and is a directory-e file file Exists-f file File exists and is a regular file-g file file exists and is Set-group-id-g FIL E file

Implementing code One, Mypath= "/var/log/httpd/" myfile= "/var/log/httpd/access.log" # Here's the-x parameter to determine if $mypath exists and has executable permissions if [!-X ' $myPath]; Then mkdir "$myPath" fi# here the-d parameter to

Php checks whether a file exists. Php is very easy to determine whether a file exists in php. you only need a function: file_exists (file path). This function is generally used to determine whether a file exists, however, it is very easy for php to

Python can determine whether a file exists, Before reading and writing a file, you must determine whether the file or directory exists. Otherwise, some processing methods may cause errors in the program. Therefore, it is best to determine whether a

Directory 1. Using the OS module Determine if a file can be read or written 2. Using the Try Statement 3. Using the Pathlib module BodyIt is usually necessary to determine whether a file or directory exists before reading

PHP uses the get_headers function to determine whether a remote file exists ,. PHP uses the get_headers function to determine whether a remote file exists. this example describes how PHP uses the get_headers function to determine whether a remote

Ext.: http://www.cnblogs.com/jhao/p/7243043.htmlIt is usually necessary to determine whether a file or directory exists before reading or writing the file, or some processing may cause the program to fail. So it's best to determine if the file

When a program is written, there are two methods to determine whether a file exists. Some use is_file and some use file_exists. Which one is better or more suitable? Determine whether an object exists using is_file or file_exists? When a program is

This tutorial shows how to verify whether a file exists and how to execute some lines of code before checking whether a file exists. It can prevent the files that are being manipulated by error information from not existent. This tutorial shows how

The PHPget_headers function checks whether a remote file exists. I used to talk about articles about how to determine whether a remote file exists in php, where I used the fopen, sockt, and curl functions to check whether the remote file exists,

PHP checks whether the file exists under different domain names. InitiallyIusedthefile_existsfunction, butthenwhenthatthrewbackane PHP checks whether the file exists under different domain names. Earlier today I needed to find out if a file exists

Php checks whether the file exists by using file_exists or is_file. According to the difference between file_exists and is_file and is_dir in PHP, we can basically understand file_existsis_dir + is_file in PHP. Write program verification: execute 100