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- _1. _I_N_T_R_O_D_U_C_T_I_O_N
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- Elvis is a clone of vi/ex, the standard UNIX editor.
- Elvis supports nearly all of the vi/ex commands, in both
- visual mode and colon mode.
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- Like vi/ex, Elvis stores most of the text in a tem-
- porary file, instead of RAM. This allows it to edit files
- that are too large to fit in a single process' data space.
- Also, the edit buffer can survive a power failure or crash.
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- Elvis runs under BSD UNIX, AT&T SysV UNIX, Minix, MS-
- DOS, Atari TOS, Coherent, OS9/68000, VMS and AmigaDos. The
- next version is also expected to add MS-Windows, OS/2 and
- MacOS. Contact me before you start porting it to some other
- OS, because somebody else may have already done it for you.
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- Elvis is freely redistributable, in either source form
- or executable form. There are no restrictions on how you
- may use it.
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- _1._1. _C_o_m_p_i_l_i_n_g
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- See the "Versions" section of this manual for instruc-
- tions on how to compile Elvis.
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- If you want to port Elvis to another O.S. or compiler,
- then you should start be reading the "Portability" part of
- the "Internal" section.
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- _1._2. _O_v_e_r_v_i_e_w _o_f _E_l_v_i_s
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- The user interface of Elvis/vi/ex is weird. There are
- two major command modes in Elvis, and a few text input modes
- as well. Each command mode has a command which allows you
- to switch to the other mode.
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- You will probably use the _v_i_s_u_a_l _c_o_m_m_a_n_d _m_o_d_e most of
- the time. This is the mode that Elvis normally starts up
- in.
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- In visual command mode, the entire screen is filled
- with lines of text from your file. Each keystroke is inter-
- pretted as part of a visual command. If you start typing
- text, it will _n_o_t be inserted, it will be treated as part of
- a command. To insert text, you must first give an "insert
- text" command. This will take some getting used to. (An
- alternative exists. Lookup the "inputmode" option.)
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- The _c_o_l_o_n _m_o_d_e is quite different. Elvis displays a
- ":" character on the bottom line of the screen, as a prompt.
- You are then expected to type in a command line and hit the
- <Return> key. The set of commands recognized in the colon
- mode is different from visual mode's.
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- June 13, 1992
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