bonnie@nanook:/var/www$ ls -la
-rw-r--r--    1 bonnie   bonnie         56 Mar 12 14:55 aftrl.txt
-rw-r--r--    1 bonnie   bonnie         15 Mar 12 14:55 beauty.txt
-rw-r--r--    1 bonnie   bonnie         66 Mar 12 14:55 begn.txt
-rw-r--r--    1 bonnie   bonnie         53 Mar 12 14:55 betr.txt
-rw-r--r--    1 bonnie   bonnie         59 Mar 12 14:55 born.txt
-rw-r--r--    1 bonnie   bonnie      35871 Mar 12 14:55 cat.txt
-rw-r--r--    1 bonnie   bonnie         95 Mar 12 14:55 dsl8.txt
-rw-r--r--    1 bonnie   bonnie        302 Mar 12 14:55 echo.txt
-rw-r--r--    1 bonnie   bonnie         31 Mar 12 14:55 knees.txt
-rw-r--r--    1 bonnie   bonnie         57 Mar 12 14:55 lights.txt
-rw-r--r--    1 bonnie   bonnie         32 Mar 12 14:55 men.txt
-rw-r--r--    1 bonnie   bonnie         55 Mar 12 14:55 money.txt
-rw-r--r--    1 bonnie   bonnie         26 Mar 12 14:55 none.txt
-rw-r--r--    1 bonnie   bonnie         22 Mar 12 14:55 occupy.txt
-rw-r--r--    1 bonnie   bonnie        161 Mar 12 14:55 science.txt
-rwxr--r--    1 bonnie   bonnie         54 Feb  5 01:16 sort.cgi
-rw-r--r--    1 bonnie   bonnie         27 Mar 12 14:55 stay.txt
-rw-r--r--    1 bonnie   bonnie         49 Mar 12 14:55 stomach.txt
-rw-r--r--    1 bonnie   bonnie         35 Mar 12 14:55 sugar.txt
-rw-r--r--    1 bonnie   bonnie         69 Mar 12 14:55 taper.txt
-rw-r--r--    1 bonnie   bonnie         35 Mar 12 14:55 tmrw.txt
-rw-r--r--    1 bonnie   bonnie         84 Mar 12 14:55 tool.txt
-rw-r--r--    1 bonnie   bonnie         20 Mar 12 14:55 two.txt
-rw-r--r--    1 bonnie   bonnie         16 Mar 12 14:55 watch.txt
-rw-r--r--    1 bonnie   bonnie        102 Mar 12 14:55 winter.txt
-rw-r--r--    1 bonnie   bonnie        103 Mar 12 14:55 world.txt
-rw-r--r--    1 bonnie   bonnie         30 Mar 12 14:55 yes.txt
bonnie@nanook:/var/www$ cat -n *.txt > cat.txt
cat: cat.txt: input file is output file
bonnie@nanook:/var/www$ i miss you
bash: i: command not found
bonnie@nanook:/var/www$