Sed command

sed Reference documents

grammar ：

sed [-hnV][-e<script>][-f<script file >][ text file ]

• -e<script> or --expression=<script> As specified in the options script To process the input text file . If not -e , that sed For the following commands ' command ....' Single quotation marks are enclosed
• -f<script file > or –file=<script file > As specified in the options script File to process the input text file .
• -h or –help Display help .
• -n or –quiet or –silent Show only script The result of the treatment .
• -V or –version Display version information .

Action description ：

• a ： newly added , a You can use a string after , These strings will appear on a new line ( The next line of the current line )
• c ： replace , c You can use a string after , These strings can replace n1,n2 Between the lines
• d ： Delete , Because it's deletion , therefore d It is usually not followed by any parameters ;
• i ： Insert , i You can use a string after , And these strings will appear on a new line ( The current line );
• p ： Print , Print a selected data out . Usually p And parameters sed -n Run together
• s ： replace , Usually the s The action can be combined with normal expression

Command cases

• -e Be careful , All the add, delete and modify commands here are just to modify the output content , Without modifying the contents of the original document

  # there $ For the last line .
  # add to  a
  sed -e 4a\newLine testfile  #  In Document No 4 Line add "newLine" Content 
  nl testfile | sed '2a drink tea' # After the second line ( Add to the third line )  add drink tea 
  nl testfile | sed '2i drink tea' # Insert... Before the second line drink tea
  #  Add multi line  \  Separate 
  nl testfile | sed '2a drink tea \  The second line ' # After the second line ( Add to the third line )  add drink tea  And the second line ,
  # Delete  d
  nl testfile | sed '2,5d' #  Delete testfile Of documents 2~5 Row content 
  nl testfile | sed '3,$d' #  To delete the  3  To the last row ,$ For the last line 
  nl testfile | sed  '/oo/d' #  Delete with oo The line of 
  #  Replace  c
  nl testfile | sed '2,5c replace 2-5 number' #  take 2~5 Replace the line with  replace 2-5 number
  #  Regular search replacement  s, Of search string 
  sed 's/ String to be replaced / New string /g' # Global replacement string ,g On behalf of the whole ,
  sed 's/ String to be replaced / New string /' # Replace only the first search 
  

• -n List

  nl testfile | sed -n '5,7p' # Output 5~7 That's ok 
  nl testfile | sed -n '/oo/p' # We found out that oo The line of 
  nl testfile | sed -n '/oo/{s/oo/kk/;p;q}'  # Search band oo The line of , And implement {} The order inside ,
  

• -i modify

  sed -i 's/oo/kk/g' testfile #  modify testfile, Global replacement oo by kk
  sed -i 's/oo/kk/g' ./test* #  modify test Opening file ,
  

• Multiple command editing

  # One  sed  command , Delete  testfile  Data from the third line to the end , And put  HELLO  Replace with  RUNOOB
  nl testfile | sed -e '3,$d' -e 's/HELLO/RUNOOB/'