Lex - How to run / compile a lex program on commandline

You first have to go to the directory which the file wordcount.l is in using cd. Then using lex wordcount.l will make the file lex.yy.c. To the run the program you need compile it with a c compiler such as gcc. With gcc you can compile it using gcc -lfl lex.yy.c. This will create a.out which can be run using ./a.out

lex file.l
gcc lex.yy.c -ly -ll
./a.out

These also works. I am using this in Ubuntu 14.04.