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I have 8 tar.gz files that all have the same name, apart from 1 number, obviously going from 1 to 8. Here is the shell script I created, the first tar.gz filename is X11R6.7.0-src1.tar.gz:
Code:
#!/bin/bash
num=1
while [ $num -lt 8 ]; do
tar -xzvf X11R6.7.0-src$num.tar.gz
$num = $num + 1
done
It starts to extract and uncompress the 1st one, but never gets to the second one - it just keeps looping on the first one. It seems as though it's ignoring the $num = $num + 1 statement and is just looping the same tar command. What am I doing wrong?
"Can you explain this expression ----> ((num=num+1))
I cannot understand the syntax."
seeLND:
from the bash man page:
((expression))
The expression is evaluated according to the rules described
below under ARITHMETIC EVALUATION. If the value of the expres-
sion is non-zero, the return status is 0; otherwise the return
status is 1. This is exactly equivalent to let "expression".
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