Linux script with 'and' and 'or' operator - linux

Question

I have a file where i need to replace a special keyword
(thorn) to (tab) and save it back. It is working just fine with below code.
#Skip the header line, and translate the thorn column separators (octal 376) to tabs
#and if there were any actual tabs in the raw file, translate them to something harmless - let's say a divide sign, octal 362
cat $input | tr '\11' '\362' | tr '\376' '\11' | tail -n 2 > $outputfile
Input file
1.header1þheader2þheader3
2.Thisþisþaþsample,input,thornþfile
3.forþtestingþscript
Output file
2.This is a sample,input,thorn file
3.for testing script
Notice the comma not getting replaced, which is what we need.
However I need to tune the code in such a way that when thorn is not present then consider comma as delimiter and replace keyword comma with tab and save it back. The problem is when I am using 'or' condition then the file when have thorn is not getting saved because its not passing the criteria of comma.
cat $input | tr '\11' '\362' | tr '\376' '\11' || tr ',' '\11' | tail -n 2 > $outputfile
I am using double pipe because when thorn is present I cannot replace ','.
Basically I am trying to figure out combination of 'and' and 'or' in linux script, but it's not working like below.
cat $input | ((tr '\11' '\367' | tr '\376' '\11') || (tr ',' '\11')) & tail -n +2 > newfile.csv

Answer 1

cat Input_file
1.header1þheader2þheader3
2.Thisþisþaþsample,input,thornþfile
3.forþthornþdelimited
4.for,comma,delimited
5.forþboth,thorn,andþcomma,delimted
For me, the thorn character þ in the above Input_File is represented by the two characters \303\276, and passing the above entries through this perl one-liner will produce the result that OP wanted:
cat Input_file | perl -ne 'if (s/\303\276/\t/g) {print} elsif (s/,/\t/g) {print} else {print}'
1.header1 header2 header3
2.This is a sample,input,thorn file
3.for thorn delimited
4.for comma delimited
5.for both,thorn,and comma,delimted

Answer 2

I have tried to get the resolution myself and it is working just fine.
Below is the code attached. however if any body can suggest any issue or any better resolution, that would be highly appreciated.
input='inputFile.csv'
if grep -q '[\376]' $input; then
cat $input | tr '\11' '\367'| tr '\376' '\11'
elif grep -q ',' $input; then
cat $input | tr ',' '\11'