"Beginner UNIX question. tail and find commands"

Post #302792553 by labelthief on Wednesday 10th of April 2013 03:21:40 PM

Wrench 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
Test Your Knowledge in Computers #535
Difficulty: Medium
In C, the Boolean type false is associated with zero while any non-zero value is associated with true.
True or False?

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debconf-set-selections - insert new default values into the debconf database SYNOPSIS
debconf-set-selections file debconf-get-selections | ssh newhost debconf-set-selections DESCRIPTION
debconf-set-selections can be used to pre-seed the debconf database with answers, or to change answers in the database. Each question will be marked as seen to prevent debconf from asking the question interactively. Reads from a file if a filename is given, otherwise from stdin. WARNING
Only use this command to seed debconf values for packages that will be or are installed. Otherwise you can end up with values in the database for uninstalled packages that will not go away, or with worse problems involving shared values. It is recommended that this only be used to seed the database if the originating machine has an identical install. DATA FORMAT
The data is a series of lines. Lines beginning with a # character are comments. Blank lines are ignored. All other lines set the value of one question, and should contain four values, each separated by one character of whitespace. The first value is the name of the package that owns the question. The second is the name of the question, the third value is the type of this question, and the fourth value (through the end of the line) is the value to use for the answer of the question. Alternatively, the third value can be "seen"; then the preseed line only controls whether the question is marked as seen in debconf's database. Note that preseeding a question's value defaults to marking that question as seen, so to override the default value without marking a question seen, you need two lines. Lines can be continued to the next line by ending them with a "" character. EXAMPLES
# Force debconf priority to critical. debconf debconf/priority select critical # Override default frontend to readline, but allow user to select. debconf debconf/frontend select readline debconf debconf/frontend seen false OPTIONS
--verbose, -v verbose output --checkonly, -c only check the input file format, do not save changes to database SEE ALSO
debconf-get-selections(1) (available in the debconf-utils package) AUTHOR
Petter Reinholdtsen <pere@hungry.com> 2012-09-10 DEBCONF-SET-SELECTIONS(1)

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