Semafori ksh
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metodo file
set -o noclobber if echo X > /tmp/LOCK.1 then else fi
metodo link simbolico
ln -s $$ /tmp/LOCK.2
metodo directory
mkdir /tmp/LOCK.3
metodo file
set -o noclobber if echo X > /tmp/LOCK.1 then else fi
metodo link simbolico
ln -s $$ /tmp/LOCK.2
metodo directory
mkdir /tmp/LOCK.3