tf is a function
tf () 
{ 
    echo this is ${0##*/} > /dev/null;
    echo a | cat - > /dev/null;
    test -f ${0##*/} && echo ${0##*/} is a regular file;
    test -d ${0##*/} || echo ${0##*/} is not a directory;
    echo a;
    echo b;
    echo c;
    echo background > /dev/null & ( exit 1 );
    echo $?;
    { 
        echo a
    };
    i=0;
    while (( i < 3 )); do
        test -r /dev/fd/$i;
        i=$(( i + 1 ));
    done;
    [[ -r /dev/fd/0 && -w /dev/fd/1 ]] || echo oops > /dev/null;
    for name in $( echo 1 2 3 );
    do
        test -r /dev/fd/$name;
    done;
    if [[ -r /dev/fd/0 && -w /dev/fd/1 ]]; then
        echo ok > /dev/null;
    else
        if (( 7 > 40 )); then
            echo oops;
        else
            echo done;
        fi;
    fi > /dev/null;
    case $PATH in 
        *$PWD*)
            echo \$PWD in \$PATH
        ;;
        *)
            echo \$PWD not in \$PATH
        ;;
    esac > /dev/null;
    while false; do
        echo z;
    done > /dev/null;
    until true; do
        echo z;
    done > /dev/null;
    echo \&\|'()' \{ echo abcde \; \};
    eval fu\%nc'()' \{ echo abcde \; \};
    type fu\%nc
}
tf2 is a function
tf2 () 
{ 
    ( { 
        time -p echo a | cat - > /dev/null
    } ) 2>&1
}
cprint.tests is a regular file
cprint.tests is not a directory
a
b
c
1
a
&|() { echo abcde ; }
fu%nc is a function
fu%nc () 
{ 
    echo abcde
}