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TECO-64 - Novice Commands

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The table below describes a set of commands that can be used by a novice user to edit files. For simplicity, no attempt is made here to describe all of the modifiers and variations that may be used with each of these, nor is any information included regarding errors that might occur, and how to respond to them. More detailed descriptions are presented in the Command Reference sections that follow.

Command Function
. The current position of dot.
= Print a numeric value on the user's terminal.
B The value of dot before the first character in the buffer. Always 0.
C Move dot one character forward in the edit buffer.
D Delete the character to the right of dot.
-D Delete the character to the left of dot.
EC Write out the edit buffer, and any remaining data in the input file, to the output file, then clear the edit buffer and close both files.
ERfilespec` Open an existing file for input.
EWfilespec` Create a new file, or overwrite an existing one.
EX Same as EC, but then exits from TECO.
FStext1`text2` Search forward for the next occurrence of text1 and replace it with text2.
-FStext1`text2` Same as -FS, but search backward.
Itext` Insert text into the edit buffer at the current position of dot.
J Move dot to the start of the buffer.
K Delete the contents of the edit buffer from dot through the next line terminator.
-K Delete the contents of the edit buffer from the start of the previous line terminator through dot.
HK Delete the entire contents of the edit buffer.
L Move dot to the start of the next line.
-L Move dot to the start of the previous line.
P Write out the contents of the edit buffer to the output file, and then read in the next page from the input file.
R Move dot one character backward in the edit buffer.
Stext` Search forward for text in the edit buffer, starting at dot.
-Stext` Same as S, but search backward.
T Type the contents of the edit buffer from dot through the next line delimiter.
-T Type the contents of the edit buffer from the start of the previous line through dot.
HT Type the entire contents of the edit buffer.
V Type the current line that dot is on.
Y Read the first page of data from the input file into the edit buffer. If any data exists in the edit buffer, it is overwritten.
Z The value of dot after the last character in the buffer. Equal to the number of characters in the buffer.

The C, D, K, L, P, R, S, T, and V commands may all be preceded by a repeat count that is either positive or negative. For example, 5C means to move dot forward 5 characters.

The J command may be preceded by a positive number in the range of B to Z inclusive. So BJ (or 0J) moves dot before the first character in the edit buffer, and ZJ moves it after the last character.

Examples

Example 1:

  • Open new output file. [EW]
  • Print size of edit buffer. [Z=]
  • Insert text. [I]
  • Print size of edit buffer to see number of characters added. [Z=]
  • Write out the contents of the edit buffer. [EC]
teco
*EWhello1.txt``
*Z=``
0
*Ihello, world!
``
*Z=``
14
*EC``

Example 2:

  • Same as before, but combine all commands in a single command string, omitting the commands to print the value of Z. Resultant file should be identical to the one created in Example 1.
teco
*EWhello2.txt` Ihello, world!
` EC ``

Example 3:

  • Open input file created in Example 1. [ER]
  • Read text into the edit buffer. [Y]
  • Type out the edit buffer. [HT]
  • Move dot down one line. [L]
  • Insert "hello again, world!". [I]
  • Type out the edit buffer again.. [HT]
  • Jump to start of edit buffer. [J]
  • Print current line. [V]
  • Jump to end of buffer. [ZJ]
  • Print previous line. [-V]
  • Open new output file. [EW]
  • Write out buffer and close files. [EC]
  • Exit TECO. [EX]
teco
*ERhello1.txt``
*Y``
*HT``
hello, world!
*L``
*Ihello again, world!
``
*HT``
hello, world!
hello again, world!
*J``
*T``
hello, world!
*ZJ``
*-T``
hello again, world!
*EWhello3.txt``
*EC``
*EX``

Example 4:

  • Open the file created in Example 2. [ER]
  • Open new output file. [EW]
  • Read text into the edit buffer. [Y]
  • Type out the edit buffer. [HT]
  • Search for "hello, ". [S]
  • Delete previous 5 characters. [-5D]
  • Insert "goodbye". [I]
  • Move forward 2 characters. [skip past ", "). [2C]
  • Insert "cruel ". [I]
  • Type out the edit buffer again. [HT]
  • Write out buffer and close files. [EC]
teco
*ERhello2.txt``
*EWhello4.txt``
*Y``
*HT``
hello, world!
*Shello``
*-5D``
*Igoodbye``
*2C``
*Icruel ``
*HT``
goodbye, cruel world!
*EC``

Example 4:

  • Open new output file. [EW]
  • Open input file created in Example 5. [ER]
  • Type out the edit buffer. [HT]
  • Insert "I don't know why you say " [I]
  • Search for ", " [S]
  • Kill remainder of line [K]
  • Insert "I say hello." [I]
  • Type out the edit buffer again. [HT]
  • Write out buffer and exit TECO. [EX]
teco
*EWhello5.txt``
*ERhello4.txt``
*Y``
*HT``
goodbye, cruel world!
*II don't know why you say ``
*S, ``
*K``
*II say hello.
``
*HT``
I don't know why you say goodbye, I say hello.
*EC``

Example 5:

  • Open input file created in Example 1. [ER]
  • Open new output file. [EW]
  • Read text into the edit buffer. [Y]
  • Search for "world!" and replace with "it's me." [FS]
  • Type out the edit buffer. [HT]
  • Write out buffer and exit TECO. [EX]
teco
*ERhello1.txt``
*EWhello6.txt``
*Y``
*FSworld!`it's me``
*HT``
hello, it's me.
*EX``

Example 6:

  • Open input file created in Example 4. [ER]
  • Open new output file. [EW]
  • Read text into the edit buffer. [Y]
  • Type out the first line. [V]
  • Delete entire buffer. [HK]
  • Insert the first four lines of Jabberwocky. [I]
  • Write out buffer and exit TECO. [EX]
teco
*ERhello5.txt``
*EWhello7.txt``
*Y``
*V``
I don't know why you say goodbye, I say hello.
*HK``
*I'Twas brillig, and the slithy toves
did gyre and gimble in the wabe.
All mimsy were the borogoves,
and the mome raths outgrabe.
``
*EX``