Perl command batch replaces some contents in the file

perl The command can replace some contents in the file in batch , The operation is very efficient . Here are a few examples :

perl -pi -e "s/aaa/bbb/gi" test.txt

• The order above puts test.txt The characters in the file aaa Replace with bbb

perl -pi.bak -e "s/aaa/bbb/gi" test.txt

• The order above puts test.txt The characters in the file aaa Replace with bbb, And generate a test.txt.bak Backup files for

find ./ -name "*.txt" | xargs perl -pi.bak -e "s/aaa/bbb/gi"

• The above command will all the files in the current directory .txt The characters in the file aaa Replace with bbb, And generate the corresponding .bak Backup files for

Be careful ： If it's a mistake can‘t do inpalce without backup , Please implement the second scheme , in the light of window Verified .

-p  tell Perl Traverse the file name parameter added later , Roughly and sed The effect of this code in is similar to  
-i  It is generally used for backup operation when reading files .
-e  tell Perl Keep up perl sentence 
-p and -i Can be put together -pi,-p -e Can also be together , however -i,-e Can't write together -ie.