View source for Trasformare una stringa in maiuscolo o minuscolo in bash

Di seguito lo script che mostra l'utilizzo del comando '''tr''' per cambiare il case di una stringa o variabile.
<pre>
#!/bin/bash
VAR=$1
echo VAR=$VAR
UPPER=$(echo $VAR | tr "[:lower:]" "[:upper:]")
LOWER=$(echo $VAR | tr "[:upper:]" "[:lower:]")
echo LOWER=$LOWER
echo UPPER=$UPPER

function echolcase () {
         echo $1 | tr "[:upper:]" "[:lower:]"
}

function echoucase () {
         echo $1 | tr "[:lower:]" "[:upper:]"
}

echo tolower $(echolcase $VAR)
echo toupper $(echoucase $VAR)

if [[ $(echolcase $1) = "yes" ]]
then
        echo you said yes/YES/yES/Yes/....
else
        echo you said something other than yes
fi

</pre>

== Riferimenti ==

* [http://groups.google.it/group/comp.unix.shell/browse_frm/thread/bc5912e2d6f61d90/87729fbdaba15c1c?lnk=st&q=bash+lowercase+variable&rnum=5&hl=it#87729fbdaba15c1c Google Gruppi: comp.unix.shell: Changing variable to lowercase]