sed string processing tool

sed can not only analyze Standard input, but also replace, delete, add, and select specific rows of given data. The basic syntax is:

sed [-nefr] [动作]

• -n Quiet mode, only output sed special processing lines
• -e Edit directly in the action of sed
• -f sed action is written in a file
• -r sed The default regular expression becomes an extended regular expression
• -i directly modify the content of the file to read instead of standard output

action:

[n1[,n2]]function

n1, n2 range of the number of lines of action, such as 10, 20 means from 10 to 20 lines. The function can be:

• a Add the next line
• c line replacement
• d delete
• i Peer insertion
• p print
• s rule replacement 1,20s/old/new/g