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Full Discussion: return IP address
Top Forums UNIX for Dummies Questions & Answers return IP address Post 302248918 by drl on Monday 20th of October 2008 06:14:47 AM
Old 10-20-2008
Hi.

Some versions of cut allow this:
Code:
#!/bin/bash -

# @(#) s1       Demonstrate sub-string extraction, character replacement.

echo
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) cut sed
set -o nounset

echo
echo " Results:"
echo "192.29.0.131" |
cut -d"." -f3- |
sed -e 's/\./_/;s/^/_/'

exit 0

Producing:
Code:
% ./s1

(Versions displayed with local utility "version")
Linux 2.6.11-x1
GNU bash 2.05b.0
cut (coreutils) 5.2.1
GNU sed version 4.1.2

 Results:
_0_131

The GNU and Solaris cut seem to accept this ... cheers, drl
 

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ECHO(1) 							   User Commands							   ECHO(1)

NAME
echo - display a line of text SYNOPSIS
echo [SHORT-OPTION]... [STRING]... echo LONG-OPTION DESCRIPTION
Echo the STRING(s) to standard output. -n do not output the trailing newline -e enable interpretation of backslash escapes -E disable interpretation of backslash escapes (default) --help display this help and exit --version output version information and exit If -e is in effect, the following sequences are recognized: \ backslash a alert (BEL)  backspace c produce no further output e escape f form feed new line carriage return horizontal tab v vertical tab NNN byte with octal value NNN (1 to 3 digits) xHH byte with hexadecimal value HH (1 to 2 digits) NOTE: your shell may have its own version of echo, which usually supersedes the version described here. Please refer to your shell's docu- mentation for details about the options it supports. AUTHOR
Written by Brian Fox and Chet Ramey. REPORTING BUGS
Report echo bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report echo translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for echo is maintained as a Texinfo manual. If the info and echo programs are properly installed at your site, the command info coreutils 'echo invocation' should give you access to the complete manual. GNU coreutils 8.5 February 2011 ECHO(1)
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