compare a character 1

[Yarka]

hi,
In bash script, I need to take out of a character of a string. For this reason, I do:
a=${a:3:1}
After, I need to compare it with a character :. For this reason, I do:
if [$a == ":"]; then ....
but, when I run my script, on my output is:
unary operator expected

How can I compare it?
Txs

 

[feherke]

Hi

That means the value of $a initially was shorter than 4 characters so ${a:3:1} returned empty string.

if [ [red]"[/red]$a[red]"[/red] == ":" ]; then

Feherke.

http://rootshell.be/~feherke/