Linux

The GCC compiler compiles and links language source programs such as C, C + +, and assembler to executable programs.GDB is a powerful program debugging tool developed by GNU under the Unix/linux.Linux does not have a suffix name concept. However,

Sometimes we need a command to execute and then execute another command, using && and | | You can do this, and the corresponding command can be a system command or shell scriptThe shell also provides a way to execute a set of commands in the current

1. Horizontal DisplaySeq-s "$" 1 10|sed '/1/s/1/$1/'1 $ $4 $ $6 $7 $8 $9 $$ $4 $ $6 $7 $8 $9 $2. Vertical DisplaySeq 9|sed ' s/[0-9]/$&/g '$1$2$3$4$5$6$7$8$93.$0 gets the file name of the currently executing shell script, including the script path$#

First, IntroductionThe Xclip command establishes a channel between the terminal and the Clipboard, which can be used to save the contents of the terminal output or file to the Clipboard in a command, or to output the contents of the Clipboard to a

"The bird's Linux private dish" in basic study P382 said that in bash "=" and "= =" are the same, all mean inference is equal, just because other languages generally use "= =". It is therefore recommended that the latter be used. but in the

Linux installation Tomcat--@ Beam WPSummary: Linux installs Tomcat.First, download Tomcat1, search Tomcat in Baidu, see the first result is with Apache tomcat-welcome words, click into Tomcat's official website.　　　　2, click on the left navigation

1. First, verify that the server is in a secure state. That is, no one is free to connect to the MySQL database.Due to the rootpassword of MySQL, MySQL database is completely out of password protection.The state. Other users are also free to log in

1). yum-y Install vsftpd db4-utils2). Create a System accountUseradd virftp-s/sbin/nologin3). Create a virtual accountVim/etc/vsftpd/vsftpd_loginTest12345674). Change Permissionschmod 600/etc/vsftpd/vsftpd_login5). Generate Library file

/etc/issue File settings to display pre-logon prompts if Tty1-tty6 is not logged in (whether or not the login is successful) The meaning of each code within the issue: \d the date of the local end time \l Display the first few terminal

1. Adding library filesFor your own compiled program (such as: MySQL), how to put their own compiled library file location to tell the system, so as to facilitate other programsof the call.You can use the following methods:1) Append the

When using command lines, there is a lot of time to find the files you need, such as LS find. S h e l L provides a complete set of string pattern matching rules, or meta-characters, when S-H-L encounters the above characters, it treats them as

Command format:grep [options] Find condition directory file Command function:For filtering, searching for specific characters Common options:-A (number) displays the (number) row after the line, in addition to the line that matches the criteria-

First, prohibit non-Whell group users to switch to root1. Modify/ETC/PAM.D/SU ConfigurationThe code is as follows:[[email protected] ~]# vi/etc/pam.d/su← Open this configuration file#auth required/lib/security/$ISA/pam_wheel.so use_uid← Find this

http://blog.csdn.net/imyang2007/article/details/7634470Summarize the commonly used tar decompression commands as a memo:Tar-C: Create compressed archives-X: Unzip-T: View content-r: Append files to the end of a compressed archive file-U: Update

LockedThe organizational section of the Net_device structure shows that the Dev_base list and the Dev_name_head and dev_name_index two hash tables are protected by a dev_base_list lock. However, the lock is only used to serialize access to lists and

Self-brought arithmetic command: expr[[email protected] ~]# Expr 1 + 5 plus 6[[email protected] ~]# expr 20-5 minus 15[[email protected] ~]# expr 20 \* 5 by 10 0[[email protected] ~]# expr 20 \ 5 except 4[[email protected] ~]# expr 22 \% 5 +

Linux grep command notes and linuxgrep command notes Grep-I is case insensitive.-- Color add colorAlias grep = grep 'grep -- color-V: displays the rows not matched by the pattern.-O only displays the strings matched by the patternReview:* Any

Linux synchronization timeRecently, I found that the time difference between the server time and my computer is 2 minutes. So I checked and found that Amazon's time server was 2 minutes behind.So I changed one. # Crontab-e // synchronously update

Linux multi-thread practice (5) Posix semaphores and mutex locks solve producer and consumer problems The difference between Posix and System V semaphores: System v semaphores can only be used for synchronization between processes, while posix

Verify the linux User Password in linux cThe encrypted password of linux users is stored in the/etc/shadow file. For descriptions of the shadow file, see the following link: http://blog.csdn.net/u011641885/article/details/46681697 At first, linux