akw ºÍlinux ÃüÁî
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 &nb
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#include<stdio.h>
void mian(){
printf("hello world!");
}
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#include<stdio.h>
void mian(){
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