•    grep print lines matching a pattern
•    wc print the number of newlines, words, and bytes in files
•    sort – sort lines of text files
•    su – change user ID or become super user
•    passwd – update a user’s authentication tokens(s)
•    who – show who is logged on
•    tar – to archive a file
•    du – estimate file space usage
•    cat – displaying and creating files
•    echo – display a line of text
•    rm -remove files or directories
•    find – search for files in a directory hierarchy
•    history – prints recently used commands
•    cp – copy files and directories
•    mv – move (rename) files
•    man shows all information about the command
•    sed stream editor for filtering and transforming text
•    awk pattern scanning and processing language
•    bg – make a foreground process to run in background
•    fg – to make background process as foreground process
•    jobs – displays the names and ids of background jobs
•    chmod – change file access permissions
•    chown – change file owner
•    chgrp change the file group
•    sort – sort lines of text files
•    kill – to terminate the process
•    ps – to view the process status
•    split – splitting of a file into multiple files
•    lp – printing of a file
•    more  paging output