Introduction to sed command of Linux

sed：Stream EDitor，Line editor:

Usage: sed [option]…’script’inputfile…

Here we will first show the contents of /etc/fstab, which will be used later.

 

Common options:

• -n：Do not export contents from the pattern to the screen.
• -e：Multipoint editing
• -f：/PATH/TO/SCRIPT_FILE：Read the edit script from the specified file
• -r：Supports extended regular expressions
• -i：Original editor

Address delimit (in the following edit command bar, for example, screenshots):

• No address: processing the full text.
• Single address:
  • #：Specified line
  • /pattern/：Each row that can be matched by this pattern.
• Address range:
  • #，#：How many lines to row?
  • #，+#：The first few lines, there are a few lines.
  • /pat1/，/pat2/：The first line that meets /pat1/ is /pat2/.
  • #，/pat/：Which line do you want to go to?

Editor’s order:

• d：Delete. Here is an example:
  • Delete the sixth row, as shown below. It is obvious that the sixth line has disappeared.
  • Delete first to 3 rows.
  • Delete the line at the beginning of UUID.

  • Delete from the first line, a total of 5 rows.

  •  Delete the line from /etc to UUID.

  • Delete the row from seventh rows to UUID.

• p：Display the contents in mode space:
  • For example, display the first line of the UUID (where all schema space content is output, and then one more line of the UUID)

  • If you want to export only what we want, use the -n above.

• a \text：Add text to the back of the row to support the use of \n to add multiple rows.
• For example, hello world! Is added to the row after /dev, and all the lines satisfying the condition are executed.
• i  \text：Insert text in front of the row to support multi row insertion using \n.
• c \text：Substitution behavior single or multi line text
• w /path/to/somefile：Save the pattern space to match the row to the specified file.
• r /path/from/somefile：Reads the text flow from the specified file to the row that matches the row in the pattern space.
• =：Print line numbers for rows in schema space
• ！：Reverse condition
• s///：Support for using other delimiters, s@@@, s###
  • Replacement mark: G: in line global replacement. P: displays the row that succeeded.