Update last character of string using shell script

Question

I am new to shell script and I want to update the last character of the string /dev/sda to next alphabet letter and loop through the count provided then write it into a file using shell script. could someone help me on this?

For Example: If Count is 10, so I want to loop 10 times to update the string and write in a file in next line with the updated string.

Sample File: myfile.txt

/dev/sda
/dev/sdb
/dev/sdc
/dev/sdd .... and so on

Answer 1

Generate all the possibilities, select only those you want.

printf '%s\n' /dev/sd{a..z} | head -n"$count"