whats special about \tmp 28. what does ls -l do 29. how do you display the contents of a file? (what are two more ways) 30. what does cat do? 31. whats mean by stdin and stdout? 32. whats a pipe? 33. how do you connect two commands 34. How would you list al the directories (subdirectories) in a directory 35. How would you change the contents of a file 36. You have a file of 10000 lines, how would you remove a comma from each line? 37. you have a file of 10000 lines, how would you remove a comma from each line without using an editor? 38. How could you sort the contents of a file numerically on the third field 39. Whats vi (besides the roman numerals for 6)? 40. what happens when you touch a file 41. how do you make a directory? 42. how do you delete a file 43. how do you delete a directory? What if its not empty 44. how do you recursively delete a directory and all of its subdirectories 45. What happens when you put an ampersand at the end of the line? 46. How do you concatenate two or more files (without using the editor)? 47. Whats another way to concatenate two or more files (without using the editor)? 48. what does >do? 49. what does >>do? 50. what does the command echo do? 51. what happens when you use a pair of backwards quotes to surround a command?