Questions and Answers

Q1

A file begins with #!/bin/csh. This means:Running the script will invoke /bin/csh to interpret the rest of the file

Q2

Which are appropriate editors for writing shell scripts?1. vi 2. nano

Q3

What does this shell script do? FOO=/tmp/foo if [ ! –d $FOO ]; then mkdir $FOO fiCreates /tmp/foo if it does not exist

Q4

Q5

Given the following part of a script: if [ -f $1 ]; then echo “I am here” fi What is the meaning of $1? It is the first argument passed to the script

Q6

Given the following script that is run through ./test.sh hello goodbye: if [ -f $2 ]; then echo "I am here" fi When will “I am here” be printed? If a file called "goodbye" exists in the current directory

Q7

What is the correct way to save the current directory to a variable?A=`pwd`

Q8

What information is held inside $? ?The previous command’s exit code

Q9

The number of users logged in is in a variable called USERS. How would you test to see if there are 5 users logged in?test $USERS –eq 5

Q10

Given the following script: while [ ! –f /tmp/foo ]; do echo –n "." process_data > /tmp/foo done Which of the following are true?1. If a file called /tmp/foo exists, process_data won’t be run 2.