learn android linux command line shell

This article was reproduced from: Http://yejinxin.github.io/parse-shell-options-with-getopt-commandIn a previous article, we described how to use the shell's built-in getopts command to help us with Shell scripting options and parameters, with the drawback that we could only handle short options and not handle long options. Below, this article is going to cover t

Special symbols and their escapeAs you know, a shell command is made up of a command name and its arguments, for example cat testfile , where cat is the command name and Testfile is a parameter. The shell passes the parameter testfile to the cat

) or a "/" slash to end a command in the row where it is located. This is often used by SQL Server and Oracle. These will not be useful in sqlite3_exec (), because the command line translates them into semicolons before passing them to the function. Compile sqlite3 from the source file The sqlite3 program is automatically created when you compile the SQLit

~ /. Msmtprc $ VI ~ /. Msmtprc Account 163 TLS on Tls_certcheck off Tls_starttls off Auth on Host smtp.163.com User Username From [email protected] Password Port 465 5. Add the following lines ~ /. Muttrc = = Set folder = ~ /Mail Mailboxes + inbox Mailboxes + linux Set Sendmail = "/usr/bin/msmtp" # The mail_address name displayed on the mail list. Set From = "mail_address" Set pager_stop = Yes Set beep = No Set Signature = "~ /. Signature" Set co

standard error , in seconds, of how long a command takes to execute, the system time, and the time command.Usage: Time [-P] Command [Argument ...]The result of the time command consists of three rows: real, user, and Sys. We use real values here, and CPU time is divided into user and sys two blocks. The real value represents the elapsed time from the be

The tree command is the protagonist of printing files and directories in a graphical structure. This command is not normally included in Linux distributions. You need to install it yourself with the package Manager. Instance: 1. Tree Print all files in current directory 2. Tree–p ${dir} Print all files in the Dir directory and their permissions 3. Tree–h ${

After logging on to the system today and logging on to N commands, I habitually used the upward arrow key to find the historical commands. I suddenly saw this: $ ^ [[A ^ [[A ^ [ Press the delete key to display the following information:$ ^ HYou can only use Ctrl + BackSpace to delete the content on the left of the cursor ~~~!!! --B Then I asked Wells, but I only needed to make a small setting and enable it in the Console: $ Set-o emasc I checked the cause on the Internet and referenced a sectio

follows:[[email protected] scripts]# exec date ==> run out of this command and exit the current session directlyWed APR 16:18:31 CST 2017Connection closed.Type ' help ' to learn. Xshell prompt.Xshell:\>Connection closed by foreign host.Also, when the file is opened with exec, the read command moves the file pointer to the next

1.1 Shell prompt[Email protected] ~]$If the last character is "#", it indicates that the current Terminal session has Superuser privileges. This permission can be obtained by logging in with the root user or using a terminal that provides superuser privileges.The prompt is defined by an environment variable named PS1 (Prompt string 1).1.2 Auto-CompletingAuto-completion can be applied to path names, variables (words starting with $), user names (beginn

12 methods for linux shell to process text line by line 1. cat $ filename | while read line example: function while_read_line {cat $ filename | while read line do www.2cto.com echo "$ line