I am generating 50 random strings, each 11-character long by running:
cat /dev/urandom | LC_ALL=C tr -dc 'A-Z' | fold -w 11 | head -n 50
Now, how could I constrain the first character to always be letter R?
RHFEKGJTUSJW
RJGHSGWNGHT
RJGHTYWERRT
RTHNBMVUFGH
RLOPOPITYWV
.....
Thanks for any hint
Would this work?
Bash:
while read line; do
echo "R$line"
done << cat /dev/urandom | LC_ALL=C tr -dc 'A-Z' | fold -w 10 | head -n 50
Assuming I haven’t made any silly mistakes, that
should generate a bunch of 11 character long, pseudo random strings that start with the letter "R".
I’m nowhere near a PC atm, so I can’t test this out, but the idea is:
Create a bunch of pseudo random 10 character strings (instead of 11 characters). And then output "R" plus each random string.
In the above, each 10 character string generated from
/dev/urandom
is redirected as input to a
while
loop, which uses the
read
command to read each line it receives into a variable called
$line
.
Inside the loop, we simply
echo
the character "R" plus the 10 character string in
$line
.
Yielding a bunch of 11 letter random strings beginning with the letter "R".
Again, at least it should….. I think!!