Find and replace methods used in VI

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1. Find and replace methods used in VI
Use the S command to replace strings. The specific usage includes:
: S/str1/str2/use string str2 to replace str1 that appears for the first time in the line
: S/str1/str2/g replace all the str1 strings in the row with str2
:., $ S/str1/str2/g replace string str1 from the current row to the end of the body with string str2
: 1, $ S/str1/str2/g replace str1 with string str2
: G/str1/S // str2/G is the same as the above replacement command. You can see that G is placed at the end of the command to replace each occurrence of the search string, it indicates that only the first appearance of the search string is replaced; G is placed at the beginning of the command, indicating that all rows containing the search string in the body are replaced.

2. Replace the file with find and grep in shell.
# Find./-exec grep str1' {}' \;-exec sed-I. Bak S/str1/str2/G '{}'\;
The above command can search for files containing str1 in the current directory (including subdirectories), automatically replace it with str2, and generate the Bak file of the source file.