How to extract a variable length substring using ksh

Question

I need to extract a variable length sub string using Korn shell on Linux.

Sample String: "SID_LIST_ORADBPOC1LSN ="

Need to extract substring: "ORADBPOC1LSN"

Note: The sample substring is of variable length.

Thanks in advance.

FR

assuming that you're looking to delete the SID_LIST (prefix) and the trailing " =", you can use parameter substitution, i.e. str="SID_LIST_ORADBPOC1LSN ="; varFix="${str#SID_LIST_}"; varFix=${varFix% =}; echo "$varFix". Output is : ORADBPOC1LSN . Good luck. — shellter
– shellter, Commented Oct 27, 2020 at 5:12
you should probably provide several examples of before/after values, or will all input values have the same format of (string) + '_' + (string) + '_' + (string) + (space) + '='? — markp-fuso
– markp-fuso, Commented Oct 27, 2020 at 12:59

RavinderSingh13 · Accepted Answer · 2020-10-27 02:25:14Z

4

With pure bash's parameter expansion capability.

var="SID_LIST_ORADBPOC1LSN ="  ##Creating shell variable here.
temp1="${var##*_}"             ##Removing everything till _ ## for longest match here.
echo "${temp1/ =/}"            ##Substituting space = with null here.
ORADBPOC1LSN

I am printing value of temp1's parameter expansion, you could save this into variable too as per your need.

OR if you want to do it in a single awk or so then try:

echo "$var" | awk -F'_| ' '{print $3}'

answered Oct 27, 2020 at 2:25

RavinderSingh13

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