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Full Discussion: String manipulation
Operating Systems OS X (Apple) String manipulation Post 302991091 by Corona688 on Monday 6th of February 2017 03:39:09 PM
Old 02-06-2017
Code:
$ echo "J1705PEAN038TDMN" | grep -o "[0-9][0-9][0-9][^0-9]*$"

038TDMN

$ VAL=$(echo "J1705PEAN038TDMN" | grep -o "[0-9][0-9][0-9][^0-9]*$")
$ VAL=${VAL:3}
$ echo $VAL

TDMN

$

There's probably more elegant ways depending on what your string actually comes from. You could probably extract it - or several - from a file and whittle it down to TDMN, etc in one step.
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LEARN ABOUT DEBIAN

ip-ntable

IP-NTABLE(8)							       Linux							      IP-NTABLE(8)

NAME

       ip-ntable - neighbour table configuration

SYNOPSIS

       ip [ OPTIONS ] address  { COMMAND | help }

       ip ntable change name NAME [ dev DEV ] PARMS

       PARMS := { thresh1 VAL | thresh2 VAL | thresh3 VAL | gc_int MSEC | base_reachable MSEC | retrans MSEC | gc_stale MSEC  | delay_probe MSEC |
	       queue LEN  | app_probs VAL | ucast_probes VAL | mcast_probes VAL  | anycast_delay MSEC | proxy_delay MSEC | proxy_queue LEN  |
	       locktime MSEC }

       ip ntable show [ dev DEV ] [ name NAME ]

DESCRIPTION

       ip ntable controls the parameters for the neighbour tables.

   ip ntable show - list the ip neighbour tables
       This commands displays neighbour table parameters and statistics.

       dev DEV
	      only list the table attached to this device.

       name NAME
	      only lists the table with the given name.

   ip ntable change - modify table parameter
       This command allows modifying table parameters such as timers and queue lengths.

       name NAME
	      the name of the table to modify.

       dev DEV
	      the name of the device to modify the table values.

EXAMPLES

       ip ntable show dev eth0
	   Shows the neighbour table (IPv4 ARP and IPv6 ndisc) parameters on device eth0.

       ip ntable change name arp_cache queue 8 dev eth0
	   Changes the number of packets queued while address is being resolved from the default value (3) to 8 packets.

SEE ALSO

       ip(8)

AUTHOR

       Manpage by Stephen Hemminger

iproute2							    20 Dec 2011 						      IP-NTABLE(8)
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