bash ldapsearch take input from file

Question

I have a simple ldapsearch bash script to return the user email when searched by ID. I made it take and argument as its input since at the time I only needed to run it once or twice.

I'm wondering can I adapt it and take input from a file like .txt and append the outputs to another file.

This is what i have:

#!/bin/bash

if [ "$1" = "" ]; then
    echo "how to: searchID.sh <userID>"
    exit 1
fi
ldapsearch -x -b '' -LLL -h ldaphost.com -p 255 uid=$1 mail >> outputs.txt

Instead of running it manually like: ./searchID.sh I0FT45

I want it to take input from a file with many ID's like:

I0001F
IGLFK7
I37462
I4593N

And run it for all those entries. Any help is very much appreciated

Answer 1

if your usernames are xargs "safe" (no space, no quote) then you can do something like this:

xargs -I {} \
    ldapsearch -x -b '' -LLL -h ldaphost.com -p 255 uid={} mail \
    < file.in \
    >> file.out