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这是***的bash指南. http://tldp.org/LDP/abs/html/

This is the best bash guide around. http://tldp.org/LDP/abs/html/

在上下文中:

if jarsigner -verbose -keystore $keyst -keystore $pass $jar_file $kalias
then
    echo $jar_file signed sucessfully
else
    echo ERROR: Failed to sign $jar_file. Please recheck the variables 1>&2
    exit 1 # terminate and indicate error
fi

...