1.文件整理

employee文件中记录了工号和姓名

employee.txt:

100 Jason Smith

200 John Doe

300 Sanjay Gupta

400 Ashok Sharma

bonus文件中记录工号和工资

bonus.txt:

100 $5,000

200 $500

300 $3,000

400 $1,250

要求把两个文件合并并输出如下

处理结果:

400 ashok sharma $1,250

100 jason smith  $5,000

200 john doe  $500

300 sanjay gupta  $3,000

# awk 'ARGIND==1{test[$1]=$0}ARGIND==2{print test[$1],$2}' employee.txt bonus.txt 100 Jason Smith $5,000200 John Doe $500300 Sanjay Gupta $3,000400 Ashok Sharma  $1,250# cat employee.txt 100 Jason Smith200 John Doe300 Sanjay Gupta400 Ashok Sharma ＃ cat bonus.txt 100 $5,000200 $500300 $3,000400 $1,250

 

（2）查看swap分区的大小

# free -m             total       used       free     shared    buffers     cachedMem:          1001        861        140         18         97        425-/+ buffers/cache:        338        663Swap:          509          0        509

 

（3）root用户今天登陆了多长时间

last查所有登陆信息，

lastlog查看最近登陆，

w或者who查看目前已经登陆用户

（4）打印当前sshd的端口和进程id

# netstat -anp | grep sshd

（5）打印root可以使用可执行文件数

# echo "root’s bins: $(find ./ -type f | xargs ls -l | sed '/-..x/p' | wc -l)"root’s bins: 53

（6）输出本机创建20000个目录所用的时间

# time for i in {1..2000} ; do mkdir neil$i; donereal    0m2.086suser    0m0.180ssys    0m0.300s[berry@berry:dirs] timereal    0m0.000suser    0m0.000ssys    0m0.000s