Shell Programming and Scripting

$ tail file1 file2 file3

#!/bin/ksh
for filename in "file 1" "file 2" "file 3"
do
         # If there is anything in the file, show which file and the last line
         if [ -s "${filename}" ]
         then
                 ls -lad "${filename}"
                 # tail hyphen one shows the last line
                 tail -1 "${filename}"
                 echo ""
         fi
done

#!/bin/ksh
ls -1 *\.txt 2>/dev/null | while read filename
do
         # If there is anything in the file, show which file and the last line
         if [ -s "${filename}" ]
         then
                 ls -lad "${filename}"
                 # tail hyphen one shows the last line
                 tail -1 "${filename}"
                 echo ""
         fi
done

#!/bin/ksh
# The above line forces Korn Shell. It could equally be bash.
#
# ls hyphen one lists the names of files and directories in the current directory
# We have assumed that there are no directory names ending in ".txt"
# The "2>/dev/null" redirects the error channel 2 to a black hole so
# the script does not fail if we have no files in the directory.
# The next line places the list of filenames onto a pipeline for processing.
# The "\." escapes the full stop such that we definitely get a fulll stop (this is unix not MSDOS).
ls -1 *\.txt 2>/dev/null | while read filename
do
         # If there is anything in the file, show which file and the last line
         # "if -s" tests whether the file exists and has any size
         if [ -s "${filename}" ]
         then
                 # "ls -lad" lists the file and does not go deeper down a tree
                 ls -lad "${filename}"
                 # tail hyphen one shows the last line
                 tail -1 "${filename}"
                 # Just output a blank line for ease of reading the output
                 echo ""
         fi
done