I want to use the abbreviated if then else to determine if ccze exists before using it... and I just cannot get that first part right...
test() {
[ $(hash ccze) 2>/dev/null ] && echo "yes" || echo "no"
}
The above is just test.. what am I doing wrong? It does not matter if ccze exists or not - I'm getting "no"
testcmd () {
command -v "$1" >/dev/null
}
Using it:
if testcmd hello; then
echo 'hello is in the path'
else
echo 'hello is not in the path'
fi
or
testcmd man && echo yes || echo no
or you could put that into a function:
ptestcmd () {
testcmd "$1" && echo 'yes' || echo 'no'
}
This way you'll have one function that does testing and a separate function that does printing dependent on the test result. You may then use the one taht is appropriate for the situation (you may not always want output).
some_function() {
hash ccze &> /dev/null && echo "yes" || echo "no"
}
Rename the function to something else because there is already the command test.
Don't override.
Remove the square brackets. Even if, in any case, you want to use square brackets, use double square brackets. Single square brackets are deprecated.
test() #(not a good name)
{
if hash ccze 2>/dev/null; then
echo yes
else
echo no
fi
}
should do it.
command -v ccze >/dev/null is also usable and fairly portable (not POSIX but works with most shells).
Thanks for that but it was the one liner I wanted. I know that version works.
Meanwhile we figured it out...
test() { [ -x "$(command -v cckze)" ] && echo "yes" || echo "no"; }
Thanks anyway.
have_command(){ command -v cckze >/dev/null; } or if you need the IO have_command(){ command -v cckze >/dev/null && echo yes || echo no; }
test to avoid overriding the test utility.