SED command Summary

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Sed: A text editor for filtering and converting, primarily for line editing, one line at a time
Usage: sed "option" {script} filename
Parameters:
-N: Cancel default output
-e: For multiple edits
-I: Used to change the replacement content
-F: Directly write the SED action in a file, and-f filename to run the SED action within filename
-r:sed's actions support the syntax of extended formal notation. (The default is the basic formal French notation)

S: is a replacement
G: is all replaced
P: Print output
D: Yes delete specified, remaining output
Example: Using SEQ or echo to output a 1-30 file
# seq 1 >sed.txt
# echo {1..30}|tr "" \ n ">sed.txt

Delete:
# sed ' 1d ' sed.txt Delete first line
# sed ' $d ' sed.txt Delete last line
# sed ' 1,5d ' sed.txt delete first to fifth line

Show:
# sed-n ' 1p ' sed.txt show first line
# sed-n ' $p ' sed.txt show last line
# sed-n ' 1,5p ' sed.txt show first to fifth line

Show Lookup lines:
# sed-n '/^2/p ' sed.txt lines starting with 2
# sed-n '/2$/p ' sed.txt line ending with 2
# sed-n '/2/p ' Sed.txt contains 2 of rows

Replace:
# sed-i ' s/2/1/g ' sed.txt replace all 2 with 1
# sed-i ' 10s/10/11/g ' sed.txt specify 10th line substitution

**Use SED to remove the IP address of the NIC
# ifconfig eth0|sed-n 2p|sed ' s/^.*dr://g ' |sed ' s/bc.*$//g ' Here is the first part taken, then the latter part
# ifconfig Eth0|sed-n 2p|sed-n ' s#^.*dr:\ (. *\) BCA.*$#\1#GP ' The parentheses here must be escaped

**Replace all files with find+sed:
# Find. -type f exec sed-i ' s/2/1/g ' {} \;

# find-type F | xargs sed-i ' s/2/1/g ';

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SED command Summary