Shell Programming and Scripting

expr '$'"$#"
 
For quick and dirty, you can:
 
echo $* | tail -2c    # two is one for line feed and one for character

VAR=$(echo 'File01'|sed 's/.*\(..$\)/\1/')
VAR=$(echo 'File01'|tail -c3)

 
for file in $@

 
For Eg: Script.sh <Directory path> <file1> <file2> <file3>....

#!/bin/bash
#################################################################################################
# This Script will check the Whether Headers and Trailers exist and not more than 1. If any file#
# does not meet this criteria script will return the non zero. If all files are ok it returns #
# zero(0). #
# Usage: Script.sh <filename><Header_identifier><Trailer_Identifier> <filename><Header_identifie#
#r><Trailer_Identifier>..... and so on. #
# #
#################################################################################################
set -x
Result=0
[ -f "$0.log" ] && > $0.log
function log
{
echo "$@" >> "$0.log"
}
for file in $@
do
################################################################################################
# Retrieve the File name, Header and Trailer identification from the arguements.
################################################################################################
file_temp=`echo $file`
length_file=${#file_temp}
filename=${file:0:length_file-2}
headerid=${file:length_file-2:1}
trailerid=${file:length_file-1:1}
################################################################################################
cd /informationserver/projectsw/TescoBank_SoW043/landing/
if [ -f $filename ]
then
if [ `grep "^[$headerid]" $filename | wc -l` = 1 ]
then
if [ `grep "^[$trailerid]" $filename | wc -l` = 1 ]
then
Result=` expr $Result + 0`
else
Result= ` expr $Result + 1`
log There is No Trailer in $filename
fi
else
if [ `grep "^[$trailerid]" $filename | wc -l` = 1 ]
then
Result=` expr $Result + 1`
log There is No Header in $file
else
Result=` expr $Result + 1`
log There is No Header&Trailer in $filename
fi
fi
else
log No $filename exists in the directory.
Result=` expr $Result + 1`
fi
done
　
echo $Result