Text viewing and processing tools

• awk - A utility and scripting language
• cat - Con-cat-enate file(s) to stdout
• cut - Extract portions of lines
• diff - Compare differences of files
• ed - The editor. ED!
• egrep - See grep
• fgrep - See grep
• grep - Global/regular expression/print (print lines matching an expression)
• head - View the top of a file
• less - A more powerful pager
• more - A less powerful pager
• nl - Number lines of files
• sed - Stream editor (non-interactive programmatic editor)
• sort - Sort input
• tac - Cat lines in reverse
• rev - Cat characters in reverse
• tail - View the bottom of a file
• tr - Transform/transliterate text
• uniq - Manipulate duplicate lines of a sorted file

Text processors in file utils' clothing

• basename - cut a line to the right from the last slash (works with any input)
• dirname - cut a line to the left from the last slash (works with any input)