set user id

Official document: Help testFile operators:-A FILE Trueif fileexists. -B FILE Trueif fileis block special. -C FILE Trueif fileis character Special. -D FILE Trueif fileis a directory. -E FILE Trueif fileexists. -F FILE Trueif fileexists and is a

Each file or directory in Linux contains access rights that determine who can access and how to access these files and directories.By setting permissions, you can restrict access by only allowing users to access them, allowing users in a

1. Core dump file system settings http://www.cnblogs.com/no7dw/archive/2013/02/18/2915819.htmlYou will need to enter-G at compile time to generate the Coredump file:GCC-G-O test test.cBuild switch and size limit for core files:1) Use the ULIMIT-C

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)

The first thing to think about is if else conditional judgment statement, the following gives a comprehensive statement: ifcondition Thencondition istrueExecute all commandselifStatementelifCondition1 ThenCondition1 istrueExecute all

1 about test testing, see the man documentationThe judgment of an expression(EXPRESSION) #EXPRESSION is True! EXPRESSION #EXPRESSION is FalseExpression1-a EXPRESSION2 #both is true,-o means orWhether the string is empty, equal-N string #the length

1. Test SwitchSome test instructions are included in the shell, and the following table lists the meanings of these test instructions and whether they are available for the test command, bash, Ksh. Switch Test Bash Ksh

Lienhua342014-10-15ISO C defines the system function for executing a command string in a program. Its statement is as follows, #include int system (const char *cmdstring); The system function calls the fork, exec, and WAITPID

1. Dependent header Files#include #include 2. Function definition:int truncate (const char *path,off_t length);int ftruncate (int fd,off_t length);Function Description:The truncate () and ftruncate () functions cause the regular file namedBy path or

The shell condition determines if the-Z to-D meaning[-A file] is true if file exists.[-B file] True if file exists and is a block special file.[-C file] True if file exists and is a word special.[-D file] True if file exists and is a directory.[-E

C-language stat functionStat #include #include function prototype: int stat (const char * file_name, struct stat * buf) * * Function Description: **stat function get file_name points to the file status of the file and saves the file

1, first to clarify the meaning of the process and thread:Process is a program with a certain independent function on a data set on a running activity, is the system for resource allocation and scheduling of an independent unit . Compared with a

　　Domain Binding Tomcat Service binding Domain name method ECS Linux system domain binding host after ping test does not take effect Nginx ways to bind multiple domain names ECS Linux can not resolve the binding domain name in the hosts of the

Let me introduce the _mkdir function of Windows below Copy Code code as follows: #include int _mkdir (const char *dirname); Parameters: DirName is the directory's path name pointer return value: If the new directory

It may be that the basics of some of the objects that have been previously available------the overall feeling that this lesson is not difficult. Although the things that I have learned are the things that I used to touch, I still feel that I have

One, what is Coredump We often hear that the program core dropped, need to locate the solution, the majority of this refers to the corresponding program due to a variety of anomalies or bugs caused in the operation of abnormal exit or stop, and

With the-p or-a parameter eg --preserve=mode,ownership,timestamps $info CP '-A ''--archive 'Preserve as much as possible of the structure and attributes of theOriginal files in the copy (but don't attempt to preserve internaldirectory structure; i.e.

The representation method and parsing of file permissions under Unix SUID is the set User ID, SGID is the meaning of the set Group ID. You can use the Ls-l command to see permissions for files under UNIX. The format of the notation obtained with

Using SCALIKEJDBC config (src\main\resources) # MySQL (Dev) dev.db.default.driver= "com.mysql.jdbc.Driver" dev.db.default.url= "jdbc:mysql:// 192.168.1.151:3306/scalalearning?useunicode=true&characterencoding=utf8 "dev.db.default.user=" root "

[-A file] is true if file exists.[-B file] True if file exists and is a block special file.[-C file] True if file exists and is a word special.[-D file] True if file exists and is a directory.[-E File] True if file exists.[-F file] True if file