It's UWAweek 26 (mid-year break)


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 UWA week 13 (1st semester, week 5) ↓
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lab4   (both)
9:54pm Tue 26th Mar, Suan C.

Hi Michael, I extracted the below codes from lab4 and have put down the queries below (after long ______). Apologies as I am still figuring out how to use more interactive editing style (at least with some colors?).


get file name from command line

check if file exists

if file doesn't exist, print error message

if [[ ! -f $1 ]] ______ why we put $1 here? $1 is the first argument? or what are we referring to? can we put $0? then 1>&2 echo ERROR ______ what does &2 here mean? exit 1 else # if file exists, print 3rd line head -n 3 $1 | tail -n 1 fi

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