Small problem with bash and forward slash

Karsh · 08-13-2010, 07:04 PM

Hi,

I have a script that grabs a numerical string from a text file that sometimes can be several slashes which in that case should have a certain action.

So:

tm=2

if [ tm="/" ]
then res=0
else
res=1
fi

This always gives me res = 0. What do I have to do so it gives me res = 1? I tried several ways in the IF like escaping the forward slash but that condition is always true.

Thanks.

Meson · 08-13-2010, 07:19 PM

You need some spaces around that equals sign. And in general you should use [[ ]].

Code:

tm=2

if [[ $tm == "/" ]]; then

    res=0

else

    res=1

fi

The = vs == doesn't really make a difference here, but I think it reads easier.

Karsh · 08-13-2010, 07:34 PM

Thanks a lot!

Karsh · 08-13-2010, 07:46 PM

I have another related question if you don't mind.

So:

Code:

nr=1
tm=2

if [[ nr != "1" || tm == "/" ]]; then
   res=0
else
   res=1
fi

Should give res = 1 right? I get res = 0.

Meson · 08-13-2010, 07:48 PM

Oops! I had a typo in my previous post. I've emitted that post but here it is again:

Code:

tm=2

if [[ $tm == "/" ]]; then

    res=0

else

    res=1

fi

You need a $ when referencing a variable.

Karsh · 08-13-2010, 07:55 PM

Everything working fine now. Thanks!