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Some exotic examples:
• Centering lines:  
• Increment a number:  
• Rename files to lower case:  
• Print bash environment:  
• Reverse chars of lines:   
Emulating standard utilities:
• tac:  Reverse lines of files
• cat -n:  Numbering lines
• cat -b:  Numbering non-blank lines
• wc -c:  Counting chars
• wc -w:  Counting words
• wc -l:  Counting lines
• head:  Printing the first lines
• tail:  Printing the last lines
• uniq:  Make duplicate lines unique
• uniq -d:  Print duplicated lines of input
• uniq -u:  Remove all duplicated lines
• cat -s:  Squeezing blank lines