Shell Scripting - check java bin
On a unix machine,开发者_Go百科 how can I write a shell script for checking if 'java bin' directory has been included in $PATH env. variable?
It's probably simplest to use which
:
which java || exit 1
if which java >/dev/null 2>&1 ; then
echo yes
fi
Since the directory name can be anything, this would be a bit hard to check by looking at the $PATH variable, but you could try looking at the return value of a command like which javac
.
which
is appropriate, but only checks for your command defined in $PATH. What if javac is not defined in $PATH but it is installed somewhere else? In that extreme case, you use find
or locate
to find where javac
is.
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