Linux shell reads the file method in line loop

Turn http://blog.csdn.net/hittata/article/details/7042779

2. #/bin/bash
6. printf "*************************************\n"
8. echo "cat file Whiel Read line"
10. Cat Test.txt |while Read line
12. Do
14. Echo $line;
16. Done
20. printf "*************************************\n"
22. echo "while read line <file"
24. While Read line
26. Do
28. Echo $line;
30. Done <test.txt
34. printf "*************************************\n"
36. echo "for line in Cat test.txt"
38. saveifs= $IFS
40. ifs=$ (echo-en "\ n")
42. For line in $ (cat test.txt)
44. Do
46. Echo $line;
48. Done
50. ifs= $SAVEIFS

Note: For line in $ (cat test.txt) when there is a space or tab in the file, be sure to set the IFS variable.