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    Command/SyntaxWhat it will do
    awk/nawk [options] filescan for patterns in a file and process the results
    cat [options] fileconcatenate (list) a file
    cd [directory]change directory
    chgrp [options] group filechange the group of the file
    chmod [options] filechange file or directory access permissions
    chown [options] owner filechange the ownership of a file; can only be done by the superuser
    chsh (passwd -e/-s) username login_shellchange the user's login shell (often only by the superuser)
    cmp [options] file1 file2compare two files and list where differences occur (text or binary files)
    compress [options] filecompress file and save it as file.Z
    cp [options] file1 file2copy file1 into file2; file2 shouldn't already exist. This command creates or overwrites file2.
    cut (options) [file(s)]cut specified field(s)/character(s) from lines in file(s)
    date [options]report the current date and time
    dd [if=infile] [of=outfile] [operand=value]copy a file, converting between ASCII and EBCDIC or swapping byte order, as specified
    diff [options] file1 file2compare the two files and display the differences (text files only)
    df [options] [resource]report the summary of disk blocks and inodes free and in use
    du [options] [directory or file]report amount of disk space in use
    echo [text string]echo the text string to stdout
    ed or ex [options] fileUnix line editors
    emacs [options] filefull-screen editor
    expr argumentsevaluate the arguments. Used to do arithmetic, etc. in the shell.
    file [options] fileclassify the file type
    find directory [options] [actions]find files matching a type or pattern
    finger [options] user[@hostname]report information about users on local and remote machines
    ftp [options] hosttransfer file(s) using file transfer protocol
    grep [options] 'search string' argument

    egrep [options] 'search string' argument

    fgrep [options] 'search string' argument

    search the argument (in this case probably a file) for all occurrences of the search string, and list them.
    gzip [options] file

    gunzip [options] file

    zcat [options] file

    compress or uncompress a file. Compressed files are stored with a .gz ending
    head [-number] filedisplay the first 10 (or number of) lines of a file
    hostnamedisplay or set (super-user only) the name of the current machine
    kill [options] [-SIGNAL] [pid#] [%job]send a signal to the process with the process id number (pid#) or job control number (%n). The default signal is to kill the process.
    ln [options] source_file targetlink the source_file to the target
    lpq [options]

    [[lpstat ]][options]

    show the status of print jobs
    lpr [options] file

    [[lp ]][options] file

    print to defined printer
    lprm [options]

    cancel [options]

    remove a print job from the print queue
    ls [options] [directory or file]list directory contents or file permissions
    mail [options] [user]

    mailx [options] [user]

    Mail [options] [user]

    simple email utility available on Unix systems. Type a period as the first character on a new line to send message out, question mark for help.
    man [options] commandshow the manual (man) page for a command
    mkdir [options] directorymake a directory
    more [options] file

    less [options] file

    pg [options] file

    page through a text file
    mv [options] file1 file2move file1 into file2
    od [options] fileoctal dump a binary file, in octal, ASCII, hex, decimal, or character mode.
    passwd [options]set or change your password
    paste [options] filepaste field(s) onto the lines in file
    pr [options] filefilter the file and print it on the terminal
    ps [options]show status of active processes
    pwdprint working (current) directory
    rcp [options] hostnameremotely copy files from this machine to another machine
    rlogin [options] hostnamelogin remotely to another machine
    rm [options] fileremove (delete) a file or directory (-r recursively deletes the directory and its contents) (-i prompts before removing file
    rmdir [options] directoryremove a directory
    rsh [options] hostnameremote shell to run on another machine
    script filesaves everything that appears on the screen to file until exit is executed
    sed [options] filestream editor for editing files from a script or from the command line
    sort [options] filesort the lines of the file according to the options chosen
    source file

    [[.]] file

    read commands from the file and execute them in the current shell. source: C shell, [[.]]: Bourne shell.
    strings [options] filereport any sequence of 4 or more printable characters ending in <NL> or <NULL>. Usually used to search binary files for ASCII strings.
    stty [options] set or display terminal control options
    tail [options] filedisplay the last few lines (or parts) of a file
    tar key[options] [file(s)]tape archiver--refer to man pages for details on creating, listing, and retrieving from archive files. Tar files can be stored on tape or disk.
    tee [options] filecopy stdout to one or more files
    telnet [host [port]]communicate with another host using telnet protocol
    touch [options] [date] filecreate an empty file, or update the access time of an existing file
    tr [options] string1 string2translate the characters in string1 from stdin into those in string2 in stdout
    uncompress file.Zuncompress file.Z and save it as a file
    uniq [options] fileremove repeated lines in a file
    uudecode [file]decode a uuencoded file, recreating the original file
    uuencode [file] new_nameencode binary file to 7-bit ASCII, useful when sending via email, to be decoded as new_name at destination
    vi [options] filevisual, full-screen editor
    wc [options] [file(s)]display word (or character or line) count for file(s)
    whereis [options] commandreport the binary, source, and man page locations for the command named
    which commandreports the path to the command or the shell alias in use
    who or wreport who is logged in and what processes are running
    zcat file.Zconcatenate (list) uncompressed file to screen, leaving file compressed on disk

    --> see: Category:Manpages

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