pipes

Lab One

    Copy the contents of /etc/passwd file into ~/myfile.txt.
    Display into standard output only the user names in the file, the first column.
    Count the number of lines/users that are in the file.
    Count the number of words in the file.
    Use the split command to generate a 256 byte suffix to the first file.
    Show the differences in the two files using the appropriate command, pipe that command to ‘wc’ and obtain a count of the characters that are different.

    cat /etc/passwd > myfile.txt
    cut -f1 -d: myfile.txt
    cat myfile.txt | wc -l
    cat myfile.txt |wc -w
    split -b 256 myfile.txt
    diff xaa xab

Lab Two

    On the command line instruct the shell to read from the current input until "stop" is inputted.
    Replace all instances of "root" in myfile.txt with "linuxroot" using sed the stream editor.
    Using grep for all for all words that start with an r have two wild card characters following and end with t.
    Grep all lines that have numbers between 5-9.

    cat << stop - enter in any command three times then enter stop.
    sed 's/root/linuxroot/g' myfile.txt (s is for replace and g means every occurrence [globally])
    grep r..t myfile.txt
    cat myfile.txt | grep [5-9]