Index

1. Example questions

• what file does the following script depend upon?

• #!/bin/bash
  
  grep -i $1 $HOME/phones

• the script is called ‘ring’ and is used as a telephone lookup service
• describe in detail the two lines of the script
• a new user who has not installed a file (as indicated by the first answer) will get a strange error
  • modify the script to test for the absence of this file and generate an informative message and terminate the script
    

2. Python example

• def displayModules(dir):
    if os.path.isdir(dir):
      if os.path.exists(os.path.join(dir,
                                     "README.texi")):
        doCat(dir, "README.texi")
  
  
      moduleMenu(dir)
      listOfModules = []
      for file in os.listdir(dir):
        if os.path.isfile(os.path.join(dir, file)):
          if (len(file)>4) and (file[-4:] == ’.def’):
            listOfModules = listOfModules + [file]
      parseModules(dir, listOfModules)
    else:
      print "directory " + dir + " not found"

• above is a python function, firstly describe the general effect of this function.
• now provide a line by line commentry of this function, you do not need to describe the functions doCat, moduleMenu and parseModules
• inside the directory foobar there exist the following files:

• a.d    b.def    c.mod    d.def    e.def

• assuming that the function in the python program is invoked displayModules("foobar") and that the current working directory can see foobar run the code by hand writing down the variable values for each iteration of the for loop
  

3. Expect example

• #!/bin/expect
  
  
  set timeout 60
  spawn ssh [lindex $argv 0]
  expect "assword: "
  send "[lindex $argv 1]\r"
  expect "\\$"
  send "cd [lindex $argv 2]\r"
  expect "\\$"
  interact

• how many arguments does this script require?
• what is the purpose of each argument?
• give a line by line commentry of this script

Index

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