what does it mean "${#pass}"

[Guest doncidaci]

i wanna to write a script to change password for many servers

 

i find a function it can create random password following lines

Code:

 

function pwdgen{

while [ "${#pass}" -le "$passLen" ]

do

passUp="${strUp:$(($RANDOM%${#strUp})):1}"

passLow="${strLow:$(($RANDOM%${#strLow})):1}"

passNum="${strNum:$(($RANDOM%${#strNum})):1}"

 

pass="$pass$passUp$passLow$passNum"

done

}

what is ${#pass}? and following "${strUp:$(($RANDOM%${#strUp})):1}"

who can explain it thx for any help

 

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