Bourne if with UPPER or Lower Case 2

[Michael42]

Hello,

Using a Bourne shell script I would like my if statement to work if the variable's value is upper or lower case "Y". What would be the syntax for this?

Note - this did not work for me: if [ $DELETE = "[Yy]" ]; then

DELETE="Y"

if [ $DELETE = "Y" ]; then
   echo "Deleting stuff..."
fi

Thanks,

Michael42

 

[hoinz]

hello,

There may be other ways, but I usually do it like this:
if [ $DELETE = Y -o $DELETE = y ]

btw, you might want to include the $DELETE in "",
just in case it is not set.

hope this helps

 

[feherke]

Hi

In such situations I use [tt]expr[/tt] :

if expr $DELETE : "[Yy]" > /dev/null; then
  echo "Deleting stuff..."
fi

Feherke.

http://rootshell.be/~feherke/

 

[feherke]

Hi

I knew it, ther is some basic matching in [tt]bash[/tt] too :

if [[ $DELETE == [Yy] ]]; then
  echo "Deleting stuff..."
fi

I must use it in the future to not forget it again...

Feherke.

http://rootshell.be/~feherke/

 

[TrojanWarBlade]

But we're not talking bash here, we're talking Bourne Shell (sh).
Does this work in "sh" too?


Trojan.

 

[feherke]

Hi

Good question. Works also when [tt]bash[/tt] is runned as [tt]sh[/tt], so theoretically sould be compatible. I have no Bourne shell to try it properly.

Feherke.

http://rootshell.be/~feherke/

 

[Michael42]

Guys - great stuff.



Thanks,

Michael42

 

[PHV]

A most portable way:
case $DELETE in
[yY]*) echo "Delete stuff ...";;
*) : Do nothing;;
esac

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ181-2886

 

[p5wizard]

or you can case-change the variable first:

DELETE=`echo ${DELETE}|tr '[a-z]' '[A-Z]'`
if [ "${DELETE}" = "Y" ]
then
 echo "Deleting stuff..."
fi

HTH,

p5wizard

 

[coffeysm]

Why not try:

if [ "${DELETE}" = "Y" ] || [ "${DELETE} = "y" ] ;
then
echo "Do something...."
fi

 

[stefanwagner]

because it's easier to localize feherkes solution:

if [[ $DELETE == [YyJj] ]]; then
  echo "Deleting stuff..."
fi
[code]

seeking a job as java-programmer in Berlin: [URL unfurl="true"]http://home.arcor.de/hirnstrom/bewerbung[/URL]

 

[coffeysm]

Yea but he wants to use Bourne Shell, I think that will only work in Bash.