Code Understand ?

varungupta · #1 (**permalink**) 05-02-2008

Hey,

Could you explain me what this code is doing ?
For example:

Code:

$i has value 9
$1 is the name of the file say FILEBkUp

    while [ "$i" != "1" ]
    do
      if [ -f $1.`/bin/expr $i - 1` ]
      then
        mv -f $1.`/bin/expr $i - 1` $1.$i
      fi
      i=`/bin/expr $i - 1`
    done

Thanks in Advance !
Varun

Perderabo · #2 (**permalink**) 05-02-2008

Let's say the basename is just xyz...

if xyz.8 exists then move xyz.8 to xyz.9
if xyz.7 exists then move xyz.7 to xyz.8
.
.
.
if xyz.1 exists then move xyz.1 to xyz.2

varungupta · #3 (**permalink**) 05-02-2008

Quote:

Originally Posted by Perderabo

Let's say the basename is just xyz...

if xyz.8 exists then move xyz.8 to xyz.9
if xyz.7 exists then move xyz.7 to xyz.8
.
.
.
if xyz.1 exists then move xyz.1 to xyz.2

Hey,

I got it.
Thanks a lot !
VarunGupta

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