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lang-c
for(x in a)can shuffle the order of your output lines, you should usefor(x=1; x in a; x++)instead if you want to retain the input order. See gnu.org/software/gawk/manual/gawk.html#Scanning-an-Array.cat -n | head -5but with different formatting for the line numbers.'{print} NR==5{exit}'or{a[NR]=$0} NR==5{exit} END{ ... }instead ofNR<6 {a[NR]=$0} END { ... }for better efficiency.