ls -l /usr/bin | more

cat /usr/bin/7z
more /usr/bin/7*
file /usr/bin/*

file /usr/bin/* | grep script
file /usr/bin/* | grep script, | cut -c 49-
file /usr/bin/* | grep script, | cut -c 49- | wc
file /usr/bin/* | grep script, | cut -c 49- | sort
file /usr/bin/* | grep script, | cut -c 49- | sort -u
file /usr/bin/* | grep script, | cut -c 49- | sort -u | egrep "^[^a]"
file /usr/bin/* | grep Bourne-Again
file /usr/bin/* | grep Bourne-Again | head -5
file /usr/bin/* | egrep "Bourne-Again.*UTF" | head -5
more /usr/bin/squeak
head -2 /usr/bin/squeak
file /usr/bin/* | egrep "POSIX" | head -5
head -2 /usr/bin/aj
file /usr/bin/* | egrep "Perl" | head -5
head -5 /usr/bin/adnmz
head -50 /usr/bin/adnmz
file /usr/bin/* | egrep "Python" | head -5
head -20 /usr/bin/aot-compile
file /usr/bin/* | grep "Ruby" | head -5
head -20 /usr/bin/adb2mhc 
file /usr/bin/* | grep "Tcl/Tk" | head -5
head -20 /usr/bin/tknamazu
file /usr/bin/* | grep Bourne-Again | wc -l
file /usr/bin/* | grep POSIX | wc -l
file /usr/bin/* | grep Perl | wc -l
file /usr/bin/* | grep Python | wc -l
file /usr/bin/* | grep Ruby | wc -l
file /usr/bin/* | grep Tcl/Tk | wc -l
find /usr/bin -type f -exec grep -q Perl {} \; -print
find /usr/bin -type f -exec grep -q Perl {} \; -exec ls -l {} \;
file /usr/bin/avr-readelf
file /usr/bin/update-manager 
file /usr/bin/avr-readelf | grep Python
echo $?
file /usr/bin/update-manager | grep Python
echo $?