akw 和linux 命令

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cat                               awk '{print}'
cat -s                      awk '{blank = NF == 0 ? ++blank : 0; if (blank <= 1) print;}'
tac                               awk '{t[NR] = $0;}END{for (i = NR; i >= 1; i--) print t[i];}'
grep patten             awk '/patten/{print}'
grep -v patten       awk '! /patten/{print}'
head                      awk 'NR <= 10 {print}' 24.sh
head -1                      awk '{print; exit; }' 24.sh
tail                      awk '{t[n++ % 10] = $0}END{for (i = 0; i < 10; i++) print t[n++ % 10];}'
tail -1                      awk '{t = $0}END{print t}'
cut -c 10             awk '{print substr($0, 10, 1)}'
cut -d: -f4             awk -F: '{if (NF > 1) print $4; else print;}'
tr A-Z a-z             awk '{print tolower($0);}' se.sh
tr a-z A-Z             awk '{print toupper($0);}' se.sh
tr -s ' '             awk '{print gensub(" +", " ", "g")}'
tr -d '/012'       awk '{printf "%s", $0}'
wc -l                      awk 'END{printf "% 7d/n", NR-1}'
uniq                      awk '{if (NR == 1 || ln != $0) print; ln = $0;}'
rev                               awk '{l = ""; for (i = length($0); i > 0; i--) printf "%c", substr($0, i, 1); print "";}'
basename             awk -F'/' '{print $NF}'
dirname                      awk -F'/' '{if (NF <= 1) printf "."; else {OFS="/"; $NF=""; printf "%s", substr($0, 1, length($0) - 1);}}'
xargs                      awk '{printf "%s ", $0}END{print}'
paste -sd:             awk 'NR > 1{printf ":%s", $0}'
cat -n                      awk '{printf "% 6d  %s/n", NR, $0}'
grep -n                      awk '/ss/{print NR":"$0}'
cp orig new             awk '{print > "new"}' orig