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A mix of all the other answers, compatible with Mac (comm), Solaris (fname) and Linux (cmd):
ps -p$$ -o cmd="",comm="",fname="" 2>/dev/null | sed 's/^-//' | grep -oE '\w+' | head -n1
A mix of all the other answers, compatible with Mac and Linux:
ps -p$$ -o cmd="",comm="" 2>/dev/null | sed 's/^-//' | grep -oE '\w+' | head -n1
ps -p$$ -o com,cmdcmd="",comm="" 2>/dev/null | sed 's/^-//' | grep -oE '\w+' | head -n1
ps -p$$ -o com,cmd,comm="" 2>/dev/null | sed 's/^-//'
