Text manipulation commands
#Notes #teachingnotes
echo - send text to stdout
cat - read file
less - read in a pager
head - read from top
tail - read from bottom
more - file perusal filter for crt viewing
sort - sort lines
uniq - report or omit repeated lines
fmt - reformat lines
pr - convert text files for printing
tr - translate or delete characters

Advanced Commads

awk - pattern scanning and processing language
grep - print lines matching pattern
sed - stream editor for filtering and transforming text