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Top Forums UNIX for Dummies Questions & Answers need to read 3° character from a text file Post 78684 by piltrafa on Thursday 21st of July 2005 12:06:58 PM
Old 07-21-2005
need to read 3° character from a text file

Hi,

I need a script to read the n° character from a text file.
eg: if the text file contains the line "123456" ,I nedd a command to display the number 4, as an example.

I tried with awk and printf but it seems only works with words separated with spaces, but in this case I have only one word "123456" and the characters are not separated.


Thanks in advance for your kindly help.
 

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ISDNCONF(1)						      Linux System Utilities						       ISDNCONF(1)

NAME
isdnconf - manipulate or read ISDN phone number config files. SYNOPSIS
isdnconf DESCRIPTION
isdnconf can manipulate or read the file /etc/isdn/callerid.conf as well as ~/.isdn. Entries can be added or removed from these files. Additionally, entries can be searched for and displayed in a way similar to grep. An entry can be an own MSN ([MSN]) or a phone number ([NUMBER]). You can use this program to build your own phonebook. These files are used by many of the other ISDN utilities that use phone numbers, to display a number symbolicly instead of as a plain number. OPTIONS
Note: usage of the options -A and -D is dangerous! The complete structure of the file may be changed, and all comments are removed! Make backups of your data files before trying these. COMMAND OPTIONS: -A Add a new entry, which is read from standard input. The following values are asked for (here with examples): Alias: Fred Number: 0815/441777 SI: 0 Zone: 4 Interface: - Flags: I|O Program: /usr/local/bin/ring User: uucp Group: user Interval: Time: 8-20 Flags: (control-D here indicates end of flags) Alias: (control-D here indicated end of entries) If you want another [Flags] entry, simply enter the data for another program for this number at the point where the control-D was given above. If you want to add another number, simply enter the data for the next number at the Alias prompt. You can also pipe the data into this program; the input data then must correspond to the prompts that the program gives! Note that you can only add one number at a time then (there's no way of telling isdnconf that you want to stop giving Flags info and start giving the next Alias info). -D Delete one or more entries which match the data options given. How to supply the data to match is discussed below (see DATA OPTIONS). -V version: display the program's version and terminate. If both -A and -D are given together, isdnconf will terminate, as this is not a valid combination. If neither -A nor -D is given, then isdnconf will display entries which match the data given. DATA OPTIONS: (none applicable for -A) -n 'number' number: match the given number. It can contain wildcards. -a 'alias' alias: match the given alias name. The name can contain wildcards. Note: due to a bug, use '?' instead of '-'. -t 'SI' SI: match the given service indicator. -c 'code' code: match the area code of the phone number. Only usable for displaying (not for -A nor -D). -i ignore case for the -n and -a options. -w word: the parameters for -n and -a must match the whole value, not just a substring. Examples (here for -n): "*34*" matches 123456, 345677, 1234 "34*" matches 34567, 34111 but not 1234 "34??" matches 3411, 3456 "34" matches only 34 Without the -w option, these would match: "*34*" matches 123456, 345677, 1234 "34*" matches 123456, 345677, 1234, 34567, 34111 "34??" matches 123456, 345677, 1234, 3411, 3456 "34" matches 123456, 345677, 1234, 3411, 3456, 34567 -d and: by default the values given to options -n, -a and -t will be combined with a logical OR. If these should be combined with a logi- cal AND (which is probably what most people expect!) you must use this -d option. In this case you can only supply each of the -n, -a and -t options exactly once. OTHER OPTIONS: -q quiet: when using the -A or -D commands, the output is suppressed. When not using the -A or -D commands, only the alias of the match- ing number is shown, or just the number in case the alias is not found. -m MSN: when used in combination with the -A command, instructs isdnconf to create a new MSN entry; the default is to create a new NUMBER entry. Only the values alias, number, SI, zone and interface are applicable to an MSN entry. The following two options do not apply to the -A and -D commands. They only change the output format. -s short: only display the alias and the number. -l long: also display the programs to run ([START]). -f 'filename' file: usually isdnconf uses the /etc/isdn/callerid.conf and the ~/.isdn files. If isdnconf should be applied to another file, use this option. -g global: only applies to the -A and -D commands. Instead of editing ~/.isdn, /etc/isdn/callerid.conf is edited. -1 first: only delete or display the first entry. -M isdnmon: used internally by isdnmon to get alias info. AUTHOR
Andreas Kool <akool@isdn4linux.de> manpage adapted from the README by Paul Slootman <paul@isdn4linux.de> SEE ALSO
callerid.conf(5), isdnlog(8) isdn4k-utils-3.1pre4 1998/12/29 ISDNCONF(1)
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