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Top Forums Shell Programming and Scripting for loop iteration and shell programming startup Post 302589972 by frappa on Friday 13th of January 2012 08:55:45 AM
Old 01-13-2012
Hi,

Last question:
you may start with 'Linux Hands on Guide', you can find it on tldp.org; it's not specifically about shell scripting, but has useful exercises at the end of each chapter that may be useful for you.

see ya
fra


---------- Post updated at 14:55 ---------- Previous update was at 14:55 ----------

Answer to first question:
$i gets the value of the first word (that is, set of contiguous, non space-interleaved characters) in the file.
in order to loop you don't have to modify $i. $i in the specific example is not a counter.

Second question: it' not very clear to me what are the starting conditions (what are the input data or files).
This User Gave Thanks to frappa For This Post:
 

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DEBCONF-SET-SELECTIONS(1)					      Debconf						 DEBCONF-SET-SELECTIONS(1)

NAME
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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