[Q] String substitution...

[CyanBlue]

Hi...

I am trying to do some string substitution...

I have a file called OBJList1.txt and it's content goes like this...
---
Sphere1 Cone1 Cube1 Cylinder1 Sphere2 Cone2 pCube1 Cylinder2
---

In one of my functions, I need to delete a certain word from the file and update the file at the same time...
So, I tried to use sed and it didn't work for me...
---
sed 's/${toDelete}//g' $OBJLIST1 > $OBJLIST1
---

Say that the word to delete is 'Cube1' and the variable 'toDelete' gets the value, and the output should be like this, but I cannot make it working...
---
Sphere1 Cone1 Cylinder1 Sphere2 Cone2 pCube1 Cylinder2
---

I am trying to figure this out for an hour with several variations but no luck yet...

Can someone tell me how to do this???

TIA

Jason

 

[dickiebird]

You need a new file to write the amended output to
Try:-

sed 's/${toDelete}//g' $OBJLIST1 > $OBJLIST1.tmp

then you can rename the temporary file back to the
original name : -

mv $OBJLIST1.tmp $OBJLIST1



Dickie Bird
db@dickiebird.freeserve.co.uk

 

[CyanBlue]

Hi, dickiebird...

Thank you for the reply...
I have tried to save it to some other file and renameing it to the original file name, and it didn't work...
What I think is that somehow sed doesn't take the variable names or I just don't know how to do it...
I tried following on the bash prompt...
---
$ sed 's/Cube1 //g' OBJList1.txt ---> this works...
---
$ a="Cylinder1 "
$ sed 's/${a}//g' OBJList1.txt ---> this doesn't work...
---
I tried using $a, ${a}, "${a}" and so on and none of those variations worked for me...

Does anybody know why and how???

TIA

Jason

 

[aigles]

Hi,

the shell doesn't make the substitution of the your variable because the expression is between '.

Try :

$ sed "s/${a}//g" OBJList1.txt

Jean Pierre.

 

[CyanBlue]

Thank you, Jean...

That does the trick...
Appreciate your help..


Jason