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[[email protected] ~]# grep-n ' root '/etc/passwd1:root:x:0:0:root:/root:/bin/bash11:operator:x:11:0:operator:/root:/sbin/nologinCreate an individual name for grep and copy the/etc/passwd[[email protected] ~]# vim. BASHRCAlias cg= ' grep--color '[Email protected] ~]# cp/etc/passwd 1.txtCP: Do you want to overwrite "

results and execution status information, and if this is not an internal command, bash invokes the built-in path variable that holds the executable binary, reading the contents of the variable. To find out if there is a file with the same name as the command executed this time, if any, execute it, if not, it will report an error message such as:-bash:commamd:command not found. The "command" may be replaced with the command being executed. As shown in the following example: [

Path to the LS Etc/init.d/shell scriptls/usr/local/apache2/Ls/usr/local/apache2/bin/apachectl1. Shell FeaturesOrder history!! !$!n! characterTab key to complete file path or commandAlias a= "B" Unalias AWildcard * Matches 0 or more characters? Match one characterInput/output redirection, >>, Pipe symbol |Job Control CTRL + Z, jobs view background Stop command, FG Recovery background Stop command, BG n n indicates to view the first few running commands in the backgroundSleep put in the backgroun

Task and Back Stack An application usually contains multiple activities.Each activity shoshould be designed around und a specific kind of action the user can perform and can start other activities.For example, an email application might have one activity to show a list of new emails.When the user selects an email, a new activity opens to view that email.An application usually contains multiple activities.Ea

); $ Views = $ row ['views']; $ Views ++; If ($ SID = $ RID) $ qsql = "Update bbs_subj set views = '$ views' Where id = '$ rid '"; Else $ qsql = "Update bbs_docs set views = '$ view' where id =' $ rid '"; Mysql_db_query ($ SQL ['db'], $ qsql );} // ================================================ ======================================Function mail_list (){Global $ php_self, $ http_host, $ email;Global $ aid, $ Sid, $ RID;Global $ way1, $ way2;

/python27", "/usr/local/python27/bin/python2.7"[email protected] ipython-1.2.1]# ln-sv/usr/local/python27/bin/ipython/usr/local/bin/"/usr/local/bin/ipython", "/usr/local/python27/bin/ipython"Using Ipython[email protected] ~]# IpythonWarning:ipython requires SQLite, your history won't be savedPython 2.7.6 (default, Feb 26 2016, 11:02:52)Type "Copyright", "credits" or "license" for more information.IPython

Coreos mainly includes the following: (1) Minimum OS: Kernel + systemd (2) run the application using docker (3) Use fleet to manage Clusters (4) using etcd for service discovery: a distributed K/V Storage engine stores configuration data Download the vagrant coreos configuration file $ Git clone https://github.com/coreos/coreos-vagrant.git $ Vagrant up $ Vagrant status Current Machine states: Core-01 running (virtualbox) Core-02 running (virtualbox)

is ${name}s"My name is Jerrys[Email protected] ~]# echo "My name is ${name}:s+w"My name is tom:s+w can see that some characters are not recognized, such as:, + ...Child bash: Open a shell in a shellThe learning of variables and the types of variablesLocal variables:Varname=value: scope for the entire bash process:Local variables:Local Varname=value: Scope is the current code snippetExport defines an environment variable, the scope of the environment

Linux Basics (1)1. There are two types of users on Linux system: Administrator (Root) and normal user2. Terminal TerminalOn Linux systems The terminal can be broadly divided into the following:Physical Terminal:/dev/consoleVirtual Terminal:/dev/tty# ctrl+alt+f1-6 switchGraphics Terminal:/dev/pts/#Analog terminal (pseudo terminal):/dev/pts#To view the terminal used by the current device:[[