basicsys@mars~/lec6>cat F5 10 20 10 10 10 30 40 40 40 basicsys@mars~/lec6>uniq F5 10 20 10 30 40 basicsys@mars~/lec6>uniq -d F5 10 40 basicsys@mars~/lec6>cat F5 10 20 10 10 10 30 40 40 40 basicsys@mars~/lec6>uniq -u F5 10 20 30 basicsys@mars~/lec6>uniq -c F5 1 10 1 20 3 10 1 30 3 40 basicsys@mars~/lec6>uniq -c -d F5 3 10 3 40 basicsys@mars~/lec6>sort F5 | uniq -c 4 10 1 20 1 30 3 40 basicsys@mars~/lec6>sort F5 | uniq -c | tr -s " " 4 10 1 20 1 30 3 40 basicsys@mars~/lec6>sort F5 | uniq -c | tr -s " " | cut -c2- 4 10 1 20 1 30 3 40 basicsys@mars~/lec6>echo $(sort F5 | uniq -c) 4 10 1 20 1 30 3 40 basicsys@mars~/lec6>echo "$(sort F5 | uniq -c)" 4 10 1 20 1 30 3 40 basicsys@mars~/lec6>tr a-z A-Z sdiosdfisayiosfiosa SDIOSDFISAYIOSFIOSA uusuasas UUSUASAS basicsys@mars~/lec6>echo "abcaaaqaaa" | tr a @ @bc@@@q@@@ basicsys@mars~/lec6>echo "abcaaaqaaa" | tr -s a @ @bc@q@ basicsys@mars~/lec6>echo "aaaabbbbcccz" | tr -s abc @#% @#%z basicsys@mars~/lec6>echo "aaaabbbbccczzzzzz"| tr -s abc abczzzzzz basicsys@mars~/lec6>echo "aaaabbbbccczzzzzz"| tr -d abc zzzzzz basicsys@mars~/lec6>cat F7 asfdasasdo %%%%666&&&&& 888 adsas^$$$$$@@@ccc%%%%888 basicsys@mars~/lec6>cat F7 | tr -cs a-zA-Z0-9 "\n" asfdasasdo 666 888 adsas ccc 888 basicsys@mars~/lec6>echo abcde | tr -d -c ad adbasicsys@mars~/lec6> basicsys@mars~/lec6>echo abcde | tr -d -c "[ad\n]" ad basicsys@mars~/lec6>echo abcde | tr -d -c "ad\n" ad basicsys@mars~/lec6>echo abcde | tr -d -c ad"\n" ad basicsys@mars~/lec6>cat F1 Jim Alchin 21 Seattle Bill Gates 8 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>sort F1 Bill Gates 8 Seattle Jim Alchin 21 Seattle Scott Neally 2122 Los Angeles Steve Jobs 246 Nevada basicsys@mars~/lec6>cat F1 | tr -s " " | cut -d" " -f3 | sort 21 2122 246 8 basicsys@mars~/lec6>sort -k 3,3 F1 Jim Alchin 21 Seattle Scott Neally 2122 Los Angeles Steve Jobs 246 Nevada Bill Gates 8 Seattle basicsys@mars~/lec6>sort -n -k 3,3 F1 Bill Gates 8 Seattle Jim Alchin 21 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>sort -k 3n,3n F1 Bill Gates 8 Seattle Jim Alchin 21 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>sort -k 3n,3 F1 Bill Gates 8 Seattle Jim Alchin 21 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>sort -k 3,3n F1 Bill Gates 8 Seattle Jim Alchin 21 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>cat F2 Jim Alchin 21 Seattle abc Bill Gates 21 Seattle def Steve Jobs 21 Nevada aaa Scott Neally 85 Los Angeles basicsys@mars~/lec6>sort -k 3n,3 -k 5,5 F2 Steve Jobs 21 Nevada aaa Jim Alchin 21 Seattle abc Bill Gates 21 Seattle def Scott Neally 85 Los Angeles basicsys@mars~/lec6>cat F3 Jim:Alchin:21:Seattle Bill:Gates:8::Seattle Steve:Jobs:246:Nevada: Scott:Neally:2122:Los:Angeles basicsys@mars~/lec6>sort -k 3,3 basicsys@mars~/lec6>sort -k 3,3 F3 Bill:Gates:8::Seattle Jim:Alchin:21:Seattle Scott:Neally:2122:Los:Angeles Steve:Jobs:246:Nevada: basicsys@mars~/lec6>sort -t : -k 3n,3 F3 Bill:Gates:8::Seattle Jim:Alchin:21:Seattle Steve:Jobs:246:Nevada: Scott:Neally:2122:Los:Angeles basicsys@mars~/lec6>sort -t : -k 4,4 F3 Bill:Gates:8::Seattle Scott:Neally:2122:Los:Angeles Steve:Jobs:246:Nevada: Jim:Alchin:21:Seattle basicsys@mars~/lec6>cat F1 Jim Alchin 21 Seattle Bill Gates 8 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>sort -k 4,4 F1 Scott Neally 2122 Los Angeles Steve Jobs 246 Nevada Jim Alchin 21 Seattle Bill Gates 8 Seattle basicsys@mars~/lec6>sort -t " " -k 4,4 F1 Bill Gates 8 Seattle Scott Neally 2122 Los Angeles Steve Jobs 246 Nevada Jim Alchin 21 Seattle basicsys@mars~/lec6>sort -k 2 F1 Jim Alchin 21 Seattle Bill Gates 8 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>sort -k +1 F1 Bill Gates 8 Seattle Jim Alchin 21 Seattle Scott Neally 2122 Los Angeles Steve Jobs 246 Nevada basicsys@mars~/lec6>cat F1 Jim Alchin 21 Seattle Bill Gates 8 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>grep 2 F1 Jim Alchin 21 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>grep ^S F1 Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>grep e$ F1 Jim Alchin 21 Seattle Bill Gates 8 Seattle basicsys@mars~/lec6>cat F1 Jim Alchin 21 Seattle Bill Gates 8 Seattle Steve Jobs 246 Nevada Scott Neally 2122 Los Angeles basicsys@mars~/lec6>grep [ae]$ F1 Jim Alchin 21 Seattle Bill Gates 8 Seattle Steve Jobs 246 Nevada