cat - concatenate and display files
cut - remove selected fields from each line of a file
sort - sort and collate lines
uniq - remove or report adjacent duplicate lines
awk - pattern scanning and processing language
sed - stream editor
tr - translate characters
diff - display line-by-line differences between pairs of text files
grep, egrep, fgrep - search a file for a string or regular expression
paste - join corresponding lines of several files, or subsequent lines of one
file
colrm - remove characters from specified columns within each line
expand, unexpand - expand TAB characters to SPACE characters, and vice versa