Tutorial Week 3

<li>  
Write a command ``dir'' to perform a long listing of files in the current directory.
Shell script file contains
        ls -l

<li>  
Write a pipeline to count the number of files in the current directory.
ls | wc -l

<li>  
Write a shell script that uses a pipeline to count the total number of bytes 
in all files in the current directory.
cat * | wc -c

<li>  
Write a pipeline which, given a pattern and a filename, will write to standard 
output the first line (and only the first line) of the file containing the 
pattern.
grep $1 $2 | head -1

<li>  
Write a shell script that takes two arguments to show the differences in file 
names between two directories.
ls $1 > /tmp/tmp1$$
ls $2 > /tmp/tmp2$$
diff /tmp/tmp1$$ /tmp/tmp2$$
rm -f /tmp/tmp*

<li>  
Write a shell script that given a pattern will search all files recursively 
from the current directory and report the names of all files containing the 
pattern.
find . -name '*' -exec grep -l $1 {} \;

<li>  
Write a shell script to change a filename given as argument to lower case, 
and rename the old file name to the new file name.
new=`echo $1 | tr "A-Z" "a-z"`
mv $1 $new

Laboratory Week 3

<li>  
Create shell commands for each of the questions of the week 3 tutorial.  Test 
each of them by running the command
        testit Question-number filename
where Question-number is one of 3.1, 3.2, etc and the filename is the name 
of the file containing your shell script.