Detailed introduction to sed command

Introduction sed is an online editor that processes content one line at a time. During processing, the currently processed line is stored in a temporary buffer, called "pattern space", and then the sed command is used to process the contents of the buffer. After the processing is completed, the contents of the buffer are sent to the screen. Then process the next line, and repeat until the end of the file. The file contents are not changed unless you use redirection to store the output. Sed is mainly used to automatically edit one or more files; simplify repeated operations on files; write conversion programs, etc. sed uses parameters [root@www ~]# sed [-nefr] [Action] options and parameters: -n: Use silent mode. In normal sed usage, all data coming from STDIN is usually listed to the terminal. But if the -n parameter is added, only the line (or action) that has been specially processed by sed will be listed. -e: Edit the sed action directly in the command line mode; -f: Directly write the sed action in a file

1. Sample code sharing about the sed command in Linux Detailed explanation

Introduction: Introduction sed is an online editor that processes content one line at a time. During processing, the currently processed line is stored in a temporary buffer, called "pattern space", then

2. Detailed explanation of sed usage

Introduction: sed is an online editor that processes content one line at a time. During processing, the currently processed line is stored in a temporary buffer, called "pattern space", and then the sed command is used to process the contents of the buffer. After the processing is completed, the contents of the buffer are sent to the screen. Then process the next line, and repeat until the end of the file. The file contents are not changed unless you use redirection to store the output. Sed is mainly used to automatically edit one or more files; simplify repeated operations on files; write conversion programs, etc.

3. PHP cannot execute the sed command in the shell script -

Introduction: PHP cannot execute the sed command in the shell script sed command---urgent sed -i '/^BOOTPROTO/d' file path sed -i '/^DEVICE/i\BOOTPROTO=none' file path------solution------- -------------Check whether exec has the authority to execute system commands. Check whether the Apache user has the authority to execute sed commands. ------

4. php cannot implement the sed command in the shell script-

Introduction: PHP cannot execute the sed command in the shell script---urgent sed -i '/^BOOTPROTO/d' file path sed -i '/^DEVICE/i\BOOTPROTO=none' file path------solution- -------------------Check whether exec has the authority to execute system commands. Check whether the Apache user has the authority to execute sed commands------Solution

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