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Old 08-13-2010, 08:04 PM   #1
Karsh
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Registered: Dec 2003
Location: Portugal
Distribution: Debian
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Small problem with bash and forward slash


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.
 
Old 08-13-2010, 08:19 PM   #2
Meson
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Registered: Oct 2007
Distribution: Arch x86_64
Posts: 606

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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.

Last edited by Meson; 08-13-2010 at 08:47 PM.
 
Old 08-13-2010, 08:34 PM   #3
Karsh
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Registered: Dec 2003
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Posts: 5

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Thanks a lot!

Last edited by Karsh; 08-13-2010 at 08:35 PM.
 
Old 08-13-2010, 08:46 PM   #4
Karsh
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Registered: Dec 2003
Location: Portugal
Distribution: Debian
Posts: 5

Original Poster
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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.

Last edited by Karsh; 08-13-2010 at 08:47 PM.
 
Old 08-13-2010, 08:48 PM   #5
Meson
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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.
 
Old 08-13-2010, 08:55 PM   #6
Karsh
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Registered: Dec 2003
Location: Portugal
Distribution: Debian
Posts: 5

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Everything working fine now. Thanks!
 
  


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