lpi linux essentials

[Email protected] ~]# ls/tmp/File-2016-11-15-19-10-06.txt ssh-igeaz44692 testcp T.txtLost+found T1.txt Tmp.txt################################################15,bash Supported QuotesAnti-quote ': command substitutionDouble quotation mark "": Weak referenceSingle quote ': Strong reference################################################16, filename wildcard GLOBBISG*: Any character of any length？ : Single arbitrary character[]: matches a single character within a specified range[Abc],[a-z],[a-z],[

and down key C-b Digital--------------> Jump directly to the window where you press the number C-b --------------> exit the current Window C-b d--------------> Temporary disconnect session after disconnection, you can also connect the yo:) C-b "--------------> Split out a window (split up and down) C-b%--------------> split out a window (split left and right) C-b o--------------> switch in a small window, suitable for use when two windows C-b (arrow key)--------------> select Smal

In a Linux system you may have found out why the system often does some tasks automatically. Who are those who are at the mercy of their work? In a Linux system, what if you want your own backup program to start running under the system automatically at some point in time, without having to start it manually? These routine work may be divided into one-time timing work and cycle time work, in the system is a

"*.txt"-print0 | xargs-0 md5sum >> CURR_DIR.MD546e17910faf509df48dbfba9729ef018./banana.txtC1DBBF63209A5580C052DC557510E7FB./11.txtA80ddf02fa3a86c14066204e4bf2dbb9./multiline.txt[Email protected] program_test]# md5sum-c CURR_DIR.MD5./banana.txt:ok./11.txt:ok./multiline.txt:ok6. Sort orderSort sorted by 2nd column[Email protected] program_test]# sort-k 2 sort.txt4 Bad 50003 Linux 501 Mac 20002 WinXP 100Sort reverse order[Email protected] program_test]

is manipulated at the time of the destructor, if the object has allocated memory internally, it causes double free for that memory because the pointer is the same. To open DF the macro experiment:$./tests addr 0x20de010ctor 0x6012b8s addr 0x20de040ctor 0x6012b8...dtor 0x6012b8s addr 0x20de040dtor 0x6012b8s addr 0x20 de040Because the two destructors are the same object, the memory that the member s points to is freed two times, resulting in a double free, which makes the program coredump.In summ

, firewall not meeting prompt, can be ignored inNet.nf_conntrack_max =25000000 -Net.netfilter.nf_conntract_max =25000000 tonet.netfilter.nf_conntract_tcp_timeout_established = the +Net.netfilter.nf_conntract_tcp_timeout_time_wait = - -Net.netfilter.nf_conntract_tcp_timeout_close_wait = - theNet.netfilter.nf_conntract_tcp_timeout_fin_wait = - * EOF $ Change the system character set to "ZH_CN." UTF-8 "so that it supports Chinese and prevents garbled problems. The corresponding Chinese character

) process management: (16) BG: Background run FG: Suspend program jobs: Show daemon Kill,killall,pkill: Kill process crontab: Set timing PS: View process Pstree: Show process status Tree top: Show process nice: Change priority nohup: Continue working after the user exits the system pgrep: Find the process that matches the condition Strace: trace the system call of a process ltrace: trace the process call library function Vmstat: Reporting virtual Memory statistics dangerous system commands: MV R

SeqUsage: seq [options] ... TailOr: seq [options] ... First Count MantissaOr: seq [options] ... First number increment MantissaPrints the number to the mantissa starting with the specified increment from the first number.Used to generate all integers from one number to another[[email protected] ~]# SEQ 1 512345[[email protected] ~]# SEQ 512345example, loop out the $ to $ #的值Remove the keyboard input value#!/bin/bash#For I in ' seq 1 $# ';d oThis article is from the "James Zhan

Tags: modified http check POC base FTP help clear Cache headYum Basics? ? Using RPM to install, uninstall software or services in Linux often encounter the dependence of RPM package, and we install software A, the hint depends on software B, when installing software B will be prompted to rely on a series of dependencies such as software C. At this point you will be able to ask whether there is a key to resolve all the dependencies during the installat

CentOS 7.4 Build LampLamp:linux, Apache, MySQL, PHPDirectory:The first part of the preparatory workSecond part installs Apache serviceThe third part installs the MySQL servicePart IV builds PHP operating environmentPart V Lamp Architecture ApplicationThe first part of the preparatory workOne: server: Linux system-centos 7.4;IP Address: 192.168.80.10Client: Take WIN7 as an example, test the result of verification, and the server in the same network seg

found, it is copied to the holding buffer, if the line has an object keyword to swap the mode buffer and keep the cache content after the output mode buffer content, The third command indicates that if the last line is reached, the content of the hold buffer will be output directly.H and H, G and G are two sets of corresponding commandsThe h and H commands are to replace the schema buffer content with the content of the hold buffer, but H is the copy that will be kept in the buffer, and the H i

txt1.txt-rw-r--r--. 1 root root 0 December 1 19:56 txt2.txt-rw-r--r--. 1 root root 0 December 1 19:56 txt3.txt-rw-r--r--. 1 root root 10240 December 1 19:57 Txt.tar################################################Do not expand view[Email protected] tmp]# TAR-TF Txt.tarTxt1.txtTxt2.txtTxt3.txtTxt.txt-rw-r--r--. 1 root root 1846 December 1 19:30 txt.txt-rw-r--r--. 1 root root 58 December 1 19:30 txt.txt.bz2Cpio: Archive ToolThis article is from the "Jameszhan