basic unix commands

I. Procedures A program (program) is an executable file stored on a disk and in a directory. Use one of the Six exec functions to read the program into the memory and execute the program.2. Process and process ID The execution instance of a program is called a process ). Some operating systems use tasks to indicate programs being executed. UNIX ensures that each process has a unique digital identifier called process ID ). The process ID is always a no

Learn about basic Linux commands: df commands and du commands-general Linux technology-Linux technology and application information. For more information, see the following. Df command This interface is used to view the status information of the Linux File System and display the capacity, used, unused, and mount point

Reuse Model. Figure 3 I/O multiplexing Model We block select calls and wait for the datagram socket to be readable. When select returns the socket readable condition, we call recvfrom to copy the datagram to the application cache.Comparing Figure 3 with figure 1 does not seem to show any superiority. In fact, because select is used, this system is required to be called rather than once. It seems that there is a little difference in the change, but the benefit of select is that we can wait for

APUE Reading Notes Chapter 2 Basic UNIX knowledgeIntroductionUNIX ArchitectureKernel, system call, {public function library, shell, application} kernel: strictly speaking, the operating system can be defined as a software, which controls computer hardware resources, provides a running environment. (Relatively small, at the core of the Environment) System Call: the kernel interface. The public function libra

Five Basic I/O models in UNIX: 1. Block I/O2. Non-blocking I/O3. I/O multiplexing (select and poll)4. Signal-driven I/O (sigio)5. asynchronous I/O (posix.1 AIO _ series functions) An input operation in UNIX generally has two different stages:1. Wait for the data to be ready.2. Copy data from the kernel to the process.For input operations on a sockt, the first

library file, in order: (ROOT)/lib->/lib->/usr/lib->/usr/local/Libcflags=-ansi-i$ (ROOT)/include-wall-dlinux-D_gnu_source $ (EXTRA) Ranlib=EchoAR=arAWK=awkLibapue=$ (ROOT)/lib/libapue.a# Common temp files to delete from each directory. Tempfiles=core core.* *.o temp.* *.out2. Complete the code in the self-built working directoryCopy the codebase to your own directory (MYAPUE)Building the first chapter code catalog$mkdir CH1$CD CH1Then copy the apue.3e makefile to CH1, remove the values that nee

/pytest.py/home/myhaspl/pypy-2.3.1-src/dotviewer/graphparse.py/home/myhaspl/pypy-2.3.1-src/dotviewer/__init__.py/home/myhaspl/pypy-2.3.1-src/dotviewer/graphclient.py/home/myhaspl/pypy-2.3.1-src/dotviewer/msgstruct.py/home/myhaspl/pypy-2.3.1-src/dotviewer/graphpage.py/home/myhaspl/pypy-2.3.1-src/dotviewer/graphserver.py/home/myhaspl/pypy-2.3.1-src/dotviewer/dotviewer.py.........................Copy files-bash-4.2$ CP mypylist MYL1Move files (You can also change the file name)-bash-4.2$ MV Myl1 MY

Shell command-line arguments-bash-4.2$ Cat test1.sh#!/bin/shecho "$"echo "$"echo "$"-bash-4.2$./test1.sh a b C./test1.shAB-bash-4.2$This blog all content is original, if reproduced please indicate sourcehttp://blog.csdn.net/myhaspl/Show all command line arguments-bash-4.2$ Cat test1.sh#!/bin/shUntil [-Z "$"]Doecho "$"ShiftDone-bash-4.2$./test1.sh a b c d E FABCDEF-bash-4.2$ Cat test1.sh#!/bin/shIndex=1For Myarg in $*Doecho "no# $index = $myarg"Let "Index+=1"Done-bash-4.2$./test1.sh a b c d E FNo

-rw-r--. 3 MYHASPL myhaspl 357304 September 08:55 mypylist1-rw-rw-r--. 3 MYHASPL myhaspl 357304 September 08:55 mypylist2-rw-rw-r--. 1 myhaspl myhaspl 31954 September 18:02 MyseDrwxr-xr-x. 8 MYHASPL myhaspl 4096 September 10:39 numpyDRWXR-----. 3 MYHASPL myhaspl 18 September 16:21. PKIDrwxrwxr-x. Root root 4096 September 16:25 pypy-2.3.1-src-rw-rw-r--. 1 myhaspl myhaspl 357304 September 17:57 SEYou can see that the number of hard links in Mypylist is increasingCreate soft links that can span dif

basic knowledge: Installation of oracle9i under Hp-unix one. Work as root user1. Configuring Kernel ParametersLog in with root user#sam access to System Administrator ManagerIn which select kernel configuration, enter later in the selection configurable parametersModify the following parametersMaxdsiz 1073741824Maxdsiz_64 2147483648Maxssiz 134217728Maxssiz_64 1073741824Maxusers 1000Nproc 20+8*m

Distributed memcached Learning (2) -- Basic memcached commands and basic memcached commands The above section describes how to compile and log on to memcahed in linux. The following describes how to use the basic memcahed command