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ls -ul | grep "filename" | awk '{ print $9, $6 ,$7, $8, }' > fl

ls -ul |awk '/filename/{print $9, $6 ,$7, $8, }' > fl

Why bother with grep?

ls -ul |awk '!/filename/{print $9, $6 ,$7, $8, }'...

tcpdump -nr testdump|awk '!/:/;gsub(/^[ \t]+|[ \t]+$/,""){print $3};a!~$0;{a=$0};{print $3};!/length/;/./;!/11\:/;!/8 7 6 5 4 3 2 1/;!/UDP/{b[i++]=$0} END {for (j=i-1; j>=0; ) print b[j--] };{for...

sed -e 's/'${line1}'/'${line1_m}'/g' will work in Bash not sh what shell are you using

hey... I just answered his q for tail... I don't understand it either myself.

tail -n 1918 filename > test