UNIX for Dummies Questions & Answers

Hi,

I am new to Unix and discovered this example problem online that I believe will help my learning:

Run the command's below
env >> xx
env >> xx
env >> xx
env >> xx
env >> xx
You will now have a file called XX with the env redirected into it 5 times
Create a script named 'username' that takes 1 argument being a file, in this instance we will use the newly created file above xx. Read the input file and look for occurrences of the current user who is executing the script. On finding an occurrence of the username take that line and append it to a file and display a line number and a bracket against the saved line.

Any ideas of how best to tackle this problem?
All replies will be much appreciated

Jimmy Champion

A bit crude and lewd, not sure what the high level requirement is, but OK. I like ksh and sed:

Code:

#!/usr/bin/ksh

if [ ! -f "$1" ]
then
 echo "Usage: ${0##*/} <evn_log>" >&2
 exit 1
fi

sed '
  =
 ' "$1" | sed '
  N
  /\<'$LOGNAME'\>/!d
  s/\n/{/
  q
 ' >> ~/user_log_file

Worth a read through this thread.
https://www.unix.com/shell-programmin...lp-please.html