04-10-2013
Beginner UNIX question. tail and find commands
hey guys, i'm in a unix course.. and while this is a homework question - i did put alittle effort into it. just wanted to ask before trial and error drives me nuts.
question 13 has us saving the last 30 characters of a file into another file
and question 14 has us saving the list of all the files that are 7 days old starting from your home directory.
i got that the last 30 characters of a file would be found by $tail -30c filename but i can't find an example in the book to save these files. if i add filename2 after filename it'll just show the last 30 characters of each. is it $tail -30c filename > filename2 to save one to the other? and for question 14 i know it would be something with $ find . -atime 7 -exec but i'm not sure how it would save the list to a file. i thought using ">" could only be done with cat in front of it to create files. our book tells us cat is for creating files and mv or cp is for moving or copying. so we're not really creating. so would i use cp or mv? help would be appreciated
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CHING(6) Games Manual CHING(6)
NAME
ching - the book of changes and other cookies
SYNOPSIS
/usr/games/ching [ hexagram ]
DESCRIPTION
The I Ching or Book of Changes is an ancient Chinese oracle that has been in use for centuries as a source of wisdom and advice.
The text of the oracle (as it is sometimes known) consists of sixty-four hexagrams, each symbolized by a particular arrangement of six
straight (---) and broken (- -) lines. These lines have values ranging from six through nine, with the even values indicating the broken
lines.
Each hexagram consists of two major sections. The Judgement relates specifically to the matter at hand (E.g., "It furthers one to have
somewhere to go.") while the Image describes the general attributes of the hexagram and how they apply to one's own life ("Thus the supe-
rior man makes himself strong and untiring.").
When any of the lines have the values six or nine, they are moving lines; for each there is an appended judgement which becomes signifi-
cant. Furthermore, the moving lines are inherently unstable and change into their opposites; a second hexagram (and thus an additional
judgement) is formed.
Normally, one consults the oracle by fixing the desired question firmly in mind and then casting a set of changes (lines) using
yarrow-stalks or tossed coins. The resulting hexagram will be the answer to the question.
Using an algorithm suggested by S. C. Johnson, the UNIX oracle simply reads a question from the standard input (up to an EOF) and hashes
the individual characters in combination with the time of day, process id and any other magic numbers which happen to be lying around the
system. The resulting value is used as the seed of a random number generator which drives a simulated coin-toss divination. The answer is
then piped through nroff for formatting and will appear on the standard output.
For those who wish to remain steadfast in the old traditions, the oracle will also accept the results of a personal divination using, for
example, coins. To do this, cast the change and then type the resulting line values as an argument.
The impatient modern may prefer to settle for Chinese cookies; try fortune(6).
SEE ALSO
It furthers one to see the great man.
DIAGNOSTICS
The great prince issues commands,
Founds states, vests families with fiefs.
Inferior people should not be employed.
BUGS
Waiting in the mud
Brings about the arrival of the enemy.
If one is not extremely careful,
Somebody may come up from behind and strike him.
Misfortune.
7th Edition May 20, 1985 CHING(6)