Substrings using Korn Shell

[javsap]

I am not able to get substring syntax using awk to work in my UNIX script. I want to look at the first record from my data files and then copy the data file to a new file name based on a string in the first record. In the example (first record from data file) below the data file is called "btpy30". I want to look at "PY3012B" in the first record below and since I have "B" at the end I want to copy this data file btpy30 to btpy30b. I would really appreciate it if anybody has any ideas on how to accomplish this! Thanks for your help.

Example of record:

PY3012B 04 ME06302003 12B MED PAYROLL EXPENDITURE ME0406302003
20030630011000 3314 NN 04
000000000000011311
1.08

 

[teklid]

Hi javsap,

file=$1 -- Input File btpy30
file2=$file"b"
if [`head -1 $file | cut -f 1 -d " "` = "PY3012B" ];then
cp $file $file2
fi

or
if [ `head -1 $file | cut -c7` = "B" ];then

the -d option with the cut command is for your field separator. If your field separator is a tab then you don't need to include -d option.

Hope this is of help.

Teklid

 

[SPguru]

In Ksh93 the substring referencing is done using ${variableffset:length} or ${variableffset}

 

[javsap]

Thanks for your help folks..I was able to resolve this problem yesterday.

 

[bi]

And the resolution was...?

 

[javsap]

sorry...I should have included that...below is the code I used


#!/bin/ksh

file='btpy30'
read first junk < ${file}
typeset -l suffix=&quot;${first#${first%?}}&quot;
cp &quot;${file}&quot; &quot;${file}${suffix}&quot;