Masking Bank Account Number except last 4 digits in the file Post: 303023106

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Top Forums Shell Programming and Scripting Masking Bank Account Number except last 4 digits in the file Post 303023106 by bakunin on Wednesday 12th of September 2018 02:29:51 AM

09-12-2018

Registered User

Quote:

Originally Posted by Pradeep R

I know how to do it in Oracle (like below), however client need in shell script.

Depending on what the rest of the shell script looks like (and, most prominently, WHICH SHELL YOU ARE USING - you might have considered telling us) you can do it with variable expansion. Here is a solution in Korn shell, i haven't tested it in bash,but it should work there too (replace "print" with "echo" then):

Code:

#! /bin/ksh

function maskpart
{
mask="${1%????}"                # extract everything save for the last 4 digits
mask="${mask//?/x}"             # and replace all characters with x's

print - "${mask}${1#${1%????}}" # print the masked part and the last 4 digits

return 0
}

# here are examples of how to use the function:
maskpart "123456-7890"
maskpart "blafoo1234"

myvar="$(maskpart "123456-7890")" ; print - $myvar

while read BAN ; do
     printf "$BAN \t==> " ; maskpart "$BAN"
done < /file/with/bank-account-numbers
exit 0

The function does not cover for bank-account-numbers being 4 digits or shorter (or otherwise malformed). If this could be the case you will have to provide extra logic.

I hope this helps.

bakunin

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rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a filename containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)