arts-week13
Algorithm
Review
HTTP协议图解
Tip
linux命令删除重复行
sort -n test.txt | uniq
sort -n test.txt | awk '{if($0!=line)print; line=$0}'
sort -n test.txt | sed '$!N; /^\(.*\)\n\1$/!P; D'
文本行数的统计
awk '{print NR}' test.txt | tail -n1
awk 'END{print NR}' test.txt
grep -n '' test.txt | awk -F : '{print $1}' | tail -n1
grep -n '' test.txt | awk -F : 'END{print $1}'
sed -n '$=' test.txt
wc -l test1.txt
wc -l test1.txt | awk '{print $1}'
cat test1.txt | wc -l
