[bash] How do you run a command for each line of a file?

The logic applies to many other objectives. And how to read .sh_history of each user from /home/ filesystem? What if there are thousand of them?

#!/bin/ksh
last |head -10|awk '{print $1}'|
 while IFS= read -r line
 do
su - "$line" -c 'tail .sh_history'
 done

Here is the script https://github.com/imvieira/SysAdmin_DevOps_Scripts/blob/master/get_and_run.sh

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