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awk doesn't have an option to edit files "in place". You can do something like this if the command works fine:
awk '{printf("%s%s",NL,$0);NL=RS}' file > newfile && mv newfile file

BTW: That's...

Try this:
awk 'NR==FNR{a[NR]=$1; next}FNR in a{print a[FNR], $0}' file1 file2

awk '
BEGIN{print "depth\ttemp\tsalinity"}
/<Depth/ {split($2,a,"\"");depth=a[2]}
/<Temperature/ {getline;temp=$1}
/<Salinity/ {getline;salinity=$1;printf "%d\t%d\t%d\n",depth,temp,salinity}
'...

awk 'END{print l}{if(i>=$2||!i){i=$2;l=$2FS$1}}' file

Do you need ouput the freq or both freq & loss?


$ cat urfile

Freq Loss
10 30
20 40
30 10
40 50
50 6

$ awk 'NR==1 {print;loss=999999;next}...

awk 'NR==1{min=$2}{a[$2]=$1;if($2<min)min=$2}END{print "Min Loss: "min," Freq: "a[min]}' file > out.txt

Not really. A character terminal displays fixed-size, fixed-width characters by definition; you can't selectively resize certain bits. Change colors, yes, change size, no. The unicode subscript...

awk 'NR==7{min=$3;max=$3}NR>7{if ($3>max){max=$3};if ($3<min){min=$3}}END{print "min: "min" max: "max}' file