commandline session $cat bash.txt hack hacker $head bash.txt hack hacker $head -n 1 bash.txt hack $head -n 2 bash.txt hack hacker $head -n 3 bash.txt hack hacker $head -v -n 1 bash.txt ==> bash.txt bash.txt <== hack hacker $ http://www.gnu.org/software/coreutils/manual/html_node/head-invocation.html $ head -n 1 qsort.c #include $ head -n 2 qsort.c #include $ head -n …