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One of Unix's most useful features is its large number of text/data manipulations programs. Some of the more propular include:
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
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