Shell Method for reading objects cyclically by row

The common code for linux shell to read files cyclically by line is as follows:

#/Bin/bash printf "********************************* * *** \ n "echo" cat file whiel read line "cat test.txt | while read line do echo $ line; done printf "************************************* \ n "echo" while read line <file "while read line do echo $ line; done <test.txt printf "*********************************** ** \ n "echo" for line in cat test.txt "SAVEIFS = $ IFS = $ (echo-en" \ n ") for line in $ (cat test.txt) do echo $ line; done IFS = $ SAVEIFS

Note: for line in $ (cat test.txt) when the file contains spaces or tabs, you must set the IFS Variable.