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Bash: Get The Last Argument Passed to a Shell Script

I'm writing a bash wrapper script that will pass arguments to the command. I need to find out the last argument if I call the wrapper as follows:

./wrapper -a -b --longarg=foo thisfilename.txt
./wrapper -a -b thisfilename.txt
./wrapper -a --next=true thisfilename.txt

=> $@ is all of them.
=> $0 is script name.
=> $1 is first arg.

I want thisfilename.txt stored in a shell variable called $last. How do I find the last argument passed to a shell script written in bash or ksh under Unix like operating systems?
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Unix Copy Command Examples [ cp command ]

How do I copy files under Unix operating system using ksh or csh or bash shell prompt?
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FreeBSD: Install zsh Shell

How do I install the Z shell ( zsh ) shell under FreeBSD 9 operating systems?
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OpenSSH: ssh-add / ssh-agent Command Set Maximum Lifetime In Seconds

I'm using a Mac OS X and combination of ssh-agent+ssh-add to adds RSA or DSA identities to the authentication agent. ssh-agent provides me a secure way of storing the private key. However, I'd like to expire identities added to the agent within half an hour. How do I set lifetime of identities added to the agent under Unix / Linux / BSD / Apple OS X operating systems?
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Linux / UNIX: Run Command a Number of Times In a Row

How do I run "foo" command 10 times (or n times) under Linux or UNIX like operating systems?
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Bash Remove Last Character From String / Line / Word

I have a file of that looks as follows:

foo bar
tom jerry
UNIX Linux

Each word and/or Linux is a different length. How do strip or remove the last character from each line using bash or ksh shell only on a Linux or Unix-like systems?
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UNIX: Lynx Browser Set / Change the Default Home Page

How do I change the default home page with Lynx browser under UNIX or Linux operating system? How do I set the startup page to http://google.co.uk with Lynx?
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Linux / UNIX: Run Commands When You Log Out

I've written a Perl script that connects to our central server for me and it allows me feed data so that I make a timesheet later. How do I run my script when I log out from Apple OS X or Linux / UNIX workstation using bash shell?
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Append Current Date To Filename in Bash Shell

How do I append current date (mm_dd_yyyy format) to a filename (e.g., backup_mm_dd_yyyy.sql) under UNIX like operating systems?
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UNIX / Linux: Kill All My Jobs Under Current Shell Session

How do I kill all the UNIX jobs I created under my current login shell such as Bash or KSH before logout?
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