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Full Discussion: Number lines of file and assign variable to each number
Top Forums Shell Programming and Scripting Number lines of file and assign variable to each number Post 302390043 by TonyFullerMalv on Tuesday 26th of January 2010 06:04:05 PM
Old 01-26-2010
Reading every line in to variables isn't necessary, how about:
Code:
$ cat numbered_file.sh
echo -n "input a number: "
read RESP

VARIABLE=`grep "^${RESP} " numbered_file`

echo "VARIABLE = ${VARIABLE}."
$

Note ^ = beginning of line and space after ${RESP} so when you enter 3 you do not also get lines 30, 31, 32, ..., 300, etc.
Run of script using your example 3 line input file:
Code:
$ ./numbered_file.sh
input a number: 3
VARIABLE = 3 more stuff.
$./numbered_file.sh
input a number: 1
VARIABLE = 1 some data.
$ ./numbered_file.sh
input a number: 2
VARIABLE = 2 something else.
$

Is that what you are after?

---------- Post updated at 23:04 ---------- Previous update was at 22:36 ----------

Otherwise you could do this:

Code:
$ cat ./numbered_file_array_select.sh

# Load array:
ARRAYPTR=0
while read LINE; do
  ARRAY_ENTRY=`echo ${LINE} | awk '{ print $1 }'`
  ARRAY_LINE=`echo ${LINE} | sed -e 's/^'${ARRAY_ENTRY}' //'`
  ARRAYPTR=`expr ${ARRAYPTR} + 1`
  ARRAYSTORE[${ARRAY_ENTRY}]=${ARRAY_LINE}
done < numbered_file

# Search Array:
echo -n "Input a number up to ${ARRAYPTR}: "
read RESP
VARIABLE=`echo ${ARRAYSTORE[${RESP}]}`

echo "VARIABLE = ${VARIABLE}."
$

Run through:
Code:
$ ./numbered_file_array_select.sh
Input a number up to 3: 2
VARIABLE = something else.
$ ./numbered_file_array_select.sh
Input a number up to 3: 1
VARIABLE = some data.
$ ./numbered_file_array_select.sh
Input a number up to 3: 3
VARIABLE = more stuff.

 

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LEARN ABOUT DEBIAN

surfraw-update-path

SURFRAW-UPDATE-PATH(1)					User Contributed Perl Documentation				    SURFRAW-UPDATE-PATH(1)

NAME

       surfraw-update-path - updates PATH in shell config files

SYNOPSIS

       surfraw-update-path [-add] [-remove] [-check] [-sys] [-all] [-help] [-shell=SHELL]

DESCRIPTION

       surfraw-update-path adds the surfraw elvi directory (/usr/lib/surfraw) to your PATH in your shell's config file.

       Currently it supports bash, sh, csh, tcsh, ash, dash, ksh, pdksh, zsh, rc, and es

       Don't forget to login again or source your login files for it to take effect.

OPTIONS

       -check
	   Checks to see if the surfraw config code is present.  This is the default.

       -add
	   Adds the surfraw config code.

       -remove
	   Removes the surfraw config code

       -sys
	   Updates the system-wide shell config instead of the user.  Must be done as root.

       -shell=SHELL
	   Selects the shell to configure. Defaults to the value of the $SHELL environment variable.

	   Currently supported shells are:

	   sh, ash, bash, dash, csh, tcsh, ksh, pdksh, zsh, rc, and es.

       -all
	   Attempts to configure the startup files for all known shells

       -help
	   Gives a usage message

RETURN VALUE

       -check returns 0 if the surfraw code is present in the file, 1 if it is not found, or 2 on error.

       All other options return 0 on success, or 2 on error.

ENVIRONMENT

       SHELL
	   Used to determine which shell to configure, if -shell is not given.

       HOME
	   Used to find users config files.

       ENV Used by posix-compliant shells to specify a startup rc file.

       ZDOTDIR
	   Used to find user config files for zsh. If not set, defaults to HOME.

SEE ALSO

       surfraw(1), sh(1), ash(1), bash(1), dash(1), csh(1), tcsh(1), ksh(1), pdksh(1), zsh(1), rc(1), es(1)

AUTHOR

       Ian Beckwith <ianb@erislabs.net>

perl v5.12.4							    2011-07-12						    SURFRAW-UPDATE-PATH(1)
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