shell shell - 锐客网

lc192

# cat words.txt the day is sunny the the the sunny is is

统计一个文本文件words.txt中每个单词出现的频率

# cat words.txt | tr ' ' '\n' | grep -v '^$' | awk '{ ++S[$1] } END { for ( a in S) print a,S[a]}' | sort -r -n -k2 the 4 is 3 sunny 2 day 1

# awk '{ for (i=1; i<=NF; i++) ++S[$i]} END { for (a in S) print a,S[a]}' words.txt | sort -r -n -k2 the 4 is 3 sunny 2 day 1

# cat words.txt | xargs -n1 | sort | uniq -c | awk '{print $2,$1}' | sort -r -n -k2 the 4 is 3 sunny 2 day 1

lc 195
打印文件的第10行
file.txt

# cat a.bash rowCount=$(awk 'END {print NR}' file.txt)if [ $rowCount -lt 10 ]; then echo "less than 10 lines" else awk '{ if (NR==10) print $0}' file.txt fi

lc 194
给定一个文件，转置它的内容

# cat file.txt name age alice 21 ryan 30 # cat file.txt | awk '{ for (i=1; i<=NF; i++) { if (NR==1) { row[i]=$i} else {row[i]=row[i]" "$i}}} END { for (a in row) {print row[a]}}' name alice ryan age 21 30

# cat file.txt name age alice 21 ryan 30 # cat a.bash colCount=$(awk 'END {print NF}' file.txt)for ((i=1; i<=$colCount; i++)); do cat file.txt | cut -d ' ' -f $i | xargs done

假设 file.txt 内容如下：
987-123-4567
123 456 7890
(123) 456-7890
你的脚本应当输出下列有效的电话号码：
987-123-4567
(123) 456-7890

# cat file.txt 987-123-4567 123 456 7890 (123) 456-7890 # cat file.txt | grep -E '([0-9]{3}-|$[0-9]{3}$ )[0-9]{3}-[0-9]{4}' 987-123-4567 (123) 456-7890

查看timewait阶段的socket的数量

netstat -antup | awk '/^tcp/ {++S[$NF]} END {for (a in S) print a,S[a]}'

6.查看打开文件句柄数最多的进程

lsof -n | awk '{print $2}' | sort | uniq -c | sort -nr -k1 | head -n1

abcdefghijklmn
一个文本有很多这样的字符串，每一行都删除c和j之间的字符

# echo abcdefghijklmn | sed 's/$[^cj]*$c[^cj]*j$[^cj]$/\1\2/g' abklmn

find . -type f -exec ls {} ;

查看打开文件句柄数最多的进程的PID

lsof | awk 'NR>1 {++S[$2]} END { for(a in S) {print a,"\t",S[a]}}'|sort -n -k 1121 23 33 43 53 63 73 83 93 103 113 123 133lsof | awk 'NR>1 {++S[$2]} END { for(a in S) {print a,"\t",S[a]}}'|sort -n -k 2|tail -n 1215785

查看各个状态的TCP Socket的个数